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CAS No. : | 497-09-6 | MDL No. : | MFCD00006971 |
Formula : | C3H6O3 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | MNQZXJOMYWMBOU-GSVOUGTGSA-N |
M.W : | 90.08 | Pubchem ID : | 439723 |
Synonyms : |
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Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | N/A |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
54% | With FAD; Staphylococcus carnosus D-fructose 1,6-bisphosphate aldolase; Streptococcus pneumonia glycerol phosphate oxidase In water-d2 at 30℃; for 22 h; Enzymatic reaction | General procedure: To a solution of DL-glycerol 3-phosphate magnesium salt (548.78 mg, 2.4 mmol) in 6.86 mL ddH2O was added D-glyceraldehyde (or L-glyceraldehyde) (2 mL, 0.5 M, 1.0 mmol) at pH 7.0, glycerol phosphate oxidase saturated with FAD (final concentration 0.2 mg/mL), catalase (1000 U, 1.18 μL) and aldolase (final concentration 0.5 mg/mL). ddH2O was added to bring the total volume to 10 mL if necessary. The reaction mixture was shaken at 30 °C for 22 h and the reaction was monitored by TLC (developed by nBuOH/AcOH/H2O 2/1/1 (v/v/v) and stained with anisaldehyde sugar stain). The pH was then adjusted to pH ~5 with 6 N HCl and 11 μL acid phosphatase (18 U) was added and the mixture was shaken at 37 °C for 24 h. After cooling to rt., the pH was adjusted to 7.0 with 1 N NaOH and the mixture was diluted with methanol. The solution was filtered through Celite and washed with methanol. The filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography (EtOAc/iPrOH/H2O 9/3/1 (v/v/v)) to afford a pale yellow syrup which was further purified by Bio gel P-2 column. The mixture of monosaccharides could be isolated by Ca2+ exchange resin column. The purification process using P-2 column or Ca2+ exchange resin column was performed with the same procedure we previously used. |
28% | Stage #1: With glycerol phosphate oxidase; recombinant D-fructose 1,6-bisphosphate aldolase from Staphylococcus carnosus; catalase In water at 20℃; for 22 h; Enzymatic reaction Stage #2: With hydrogenchloride; acid phosphatase from sweet potato In water at 37℃; for 24 h; Enzymatic reaction |
To a solution of DL-glycerol 3-phosphate magnesium salt (548.78 mg, 2.4 mmol) in 6.86 mL ddH2O were added D-glyceraldehyde (or L-glyceraldehyde) (2 mL, 0.5 M, 1.0 mmol) at pH 7.0, glycerol phosphate oxidase (70 U, 2 mg), catalase (1000 U, 1.18 μL), and FruAS.car (final concentration 0.5 mg/mL). ddH2O was added to bring the total volume to 10 mL if necessary. The mixture was shaken at rt for 22 h and the reaction was monitored by TLC (developed by nBuOH/AcOH/H2O: 2/1/1 (v/v/v) and stained with anisaldehyde sugar stain). The pH was then adjusted to pH .similar.5 with 6 M HCl and 11 μL acid phosphatase (18 U) was added and the mixture was shaken at 37 °C for 24 h. After cooling to rt, the pH was adjusted to 7.0 with 1 M NaOH and the mixture was diluted with methanol. The solution was filtered through Celite and washed with methanol. The filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography (EtOAc/iPrOH/H2O: 9/3/1 (v/v/v)) to afford a pale yellow syrup which was further purified by Bio gel P-2 column. After purification, 108 mg d-fructose (60percent yield based on d-glyceraldehyde) and 50.9 mg l-sorbose (28percent yield based on l-glyceraldehyde) were obtained, respectively. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
98% | Part 1 Ethyl (2E,4R)-4,5-isopropylidenedioxy-2-pentenoate (Scheme XV; 20) A solution of (2S,3R)-1,2-O-isopropylidene-butane-1,2,3,4-tetrol 19 (11.0 g, 68.1 mmol) in CH2Cl2 (120 mL) containing saturated NaHCO3 solution (4.5 mL) was cooled to 0° C., treated with NaIO4 (29.1 g, 136.3 mmol) and allowed to stir at 0° C. to 20° C. After 2 to 3 h (TLC analysis), solid Na2SO4 (6 g) was added and the reaction mixture was stirred further for 15 min. The reaction mixture was filtered and solvent evaporated (below 25° C. bath temperature) to give (S)-glyceraldehyde 19a (8.7 g) in 98percent yield as a colorless liquid. Compound 19 was prepared by procedures described in J. Am. Chem. Soc., 102, 6304 (1980); and J. Org. Chem., 53, 2598 (1988). | |
98% | Part 1: Ethyl (2E,4R)-4,5-isopropylidenedioxy-2-pentenoate (Scheme IX; 20): A solution of (2S,3R)- 1,2-O-isopropylidene-butane- 1,2,3,4-tetrol 19 (11.0 g, 68.1 mmol) in CH2Cl2 (120 mL) containing saturated NaHCO3 solution (4.5 mL) was cooled to 0° C., treated with NaIO4 (29.1 g, 136.3 mmol) and allowed to stir at 0° C. to 20° C. After 2 to 3 h (TLC analysis), solid Na2SO4 (6 g) was added and the reaction mixture was stirred further for 15 min. The reaction mixture was filtered and solvent evaporated (below 25° C. bath temperature) to give (S)-glyceraldehyde 19a (8.7 g) in 98percent yield as a colorless liquid. Compound 19 was prepared by procedures described in J Am. Chem. Soc., 102, 6304 (1980); and J Org Chem., 53, 2598 (1988). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Step 1 (S)-(-)-2,2-dimethyl-1,3-dioxolane-4-carboxaldehyde The desired compound was prepared as described in Jackson, Synthetic Commun. 1988, 18(4), 337-341), except starting with L-<strong>[497-09-6](S)-glyceraldehyde</strong>, prepared as described by Hubschwerlen, C. Synthesis, 1986, 962-964, instead of D-(R)-glyceraldehyde. | ||
Step 1: (S) -(-)2,2-dimethyl-1,3-dioxolane-4-carboxaldehyde. The desired compound was prepared as described in Jackson, Synthetic Commun. 1988, 18(4), 337-341), except starting with L-<strong>[497-09-6](S)-glyceraldehyde</strong>, prepared as described by Hubschwerlen, C. Synthesis, 1986, 962-964, instead of D-(R)-glyceraldehyde. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
EXAMPLE 42 (R)-1-tert.butylamino-3-(2-methyltheino[3,2-c]pyridin-4-yloxy)-2-propanol The process is effected in a manner analogous to Example 1, using (R)-4-(3-tert.butyl-2-phenyl-5-oxazolidinylmethoxy)-2-methylthieono[3,2-c]-pyridine [process a)], or in a manner analogous to Example 2, using 4-chloro-2-methylthieno[3,2-c]pyridine and (R)-1-tert.butylamino-2,3-dihydroxypropane [process b)], whereby the title compound is obtained. (M.P. of the hydrogen maleate: 166°-167°); [alpha]20546 ' +12.20° (c = 2.:09; methanol). The starting materials are obtained in a manner analogous to that described in Example 41, using (S)-glyceraldehyde, whereby the following intermediates are isolated: |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
49.4% | 2-(5-{3-chloro-4-[(1-methylethyl)oxy]phenyl}-1 ,3,4-thiadiazol-2-yl)-3-methyl-4, 5,6,7- tetrahydro-2H-pyrazolo[4,3-c]pyridine (Example 1 )(150 mg, 0.39 mmol), (2S)-2,3- dihydroxypropanal (139 mg, 1.54 mmol) and sodium triacetoxyborohydride (326 mg, 1.54 mmol) were dissolved in dichloromethane (DCM) (4.5 mL) and Methanol (0.5 mL) at RT under N2 and stirred for 2 days. More aldehyde (70 mg, 2 eq.) and sodium triacetoxyborohydride (163 mg, 2 eq.) were added with more MeOH (1 mL) and DCM (1 mL) and stirring continued for 3 days. The mixture was diluted with DCM (10 mL) and washed with saturated aqueous sodium bicarbonate solution, then the mixture was separated on a phase sep cartridge and the chlorinated phase and evaporated under vacuum to give a dark brown oil which was dissolved in 1 :1 MeOH:DMSO (1 ml.) and purified by Mass Directed AutoPrep (Method Formate). The solvent was evaporated under vacuum to give an off white solid (2R)-3-[2-(5-{3-chloro-4-[(1- methylethyl)oxy]phenyl}-1 ,3,4-thiadiazol-2-yl)-3-methyl-2,4,6,7-tetrahydro-5H- pyrazolo[4,3-c]pyridin-5-yl]-1 ,2-propanediol formic acid salt (97 mg, 49.4percent) LCMS: Retention time 0.82 min; [M+H]+ = 464 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In methanol; dichloromethane; | L-Glyceraldehyde (182 mg, 2.02 mmol) as added to a stirred solution of 2-[(1- methylethyl)oxy]-5-[5-(3-methyl-4,5,6,7-tetrahydro-2H-pyrazolo[4,3-c]pyridin-2-yl)- 1 ,3,4-thiadiazol-2-yl]benzonitrile (Example 3) (200 mg, 0.4 mmol) in dichloromethane (5 ml.) and methanol (1 ml_). After stirring for 15 minutes sodium triacetoxyborohydride (429 mg, 2.02 mmol) was added and stirring continued overnight at room temperature. Saturated NaHCObeta (10 ml.) was added and the mixture extracted with ethyl acetate (3x10 ml_). The combined extracts were washed with brine, dried and evaporated. The residue was chromatographed [2-10percent methanol/dichloromethane] twice and pure fractions combined to give 5-(5-{5-[(2R)- 2,3-dihydroxypropyl]-3-methyl-4,5,6,7-tetrahydro-2H-pyrazolo[4,3-c]pyridin-2-yl}- 1 ,3,4-thiadiazol-2-yl)-2-[(1-methylethyl)oxy]benzonitrile as a colourless solid (20 mg, 11 percent) LCMS: Retention time 0.77 min; [M+H]+ = 455 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
L-glyceraldehyde (1.84g, 21 mmol) was added to a stirred solution of 2-[(1- methylethyl)oxy]-5-[3-(5-methyl-1 ,2,3,4-tetrahydro-6-isoquinolinyl)-1 ,2,4-oxadiazol-5- yl]benzonitrile trifluoroacetate (Preparation 25) (2.Og, 4.1 mmol) in DCM (50ml) and methanol (5ml). The mixture was stirred at room temperature for 20min then treated with sodium triacetoxyborohydride (4.34g, 21 mmol). The reaction mixture was stirred at room temperature overnight. The reaction mixture was concentrated to approx. half volume and diluted with ethyl acetate (50ml). The mixture was washed with saturated sodium hydrogen carbonate (3x 25ml). The organic phase was separated, washed with brine, dried and evaporated. The residue was chromatographed (methanol / DCM, 5percent). The product was dissolved in DCM (20ml) and treated with hydrogen chloride in diethyl ether (1 M, 5ml). The solvent was evaporated and the residue triturated with diethyl ether to give 5-(3-{2-[(2/?)-2,3- dihydroxypropyl]-5-methyl-1 ,2,3,4-tetrahydro-6-isoquinolinyl}-1 ,2,4-oxadiazol-5-yl)-2- [(1-methylethyl)oxy]benzonitrile hydrochloride as a colourless solid (1.Og). LCMS (Method formate): Retention time 0.84min, MH+ = 449 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
69% | To a stirred suspension of <strong>[497-09-6]L-(-)-glyceraldehyde</strong> (127mg, 1.4 mmol) and 2-[(1- methylethyl)oxy]-5-[3-(2,3,4,5-tetrahydro-1 H-3-benzazepin-7-yl)-1 ,2,4-oxadiazol-5- yl]benzonitrile hydrochloride (Preparation 43) (187mg, 0.46 mmol) in DCM (10ml) under nitrogen, was added acetic acid (0.039ml, 0.68 mmol) followed by sodium triacetoxyborohydride (436mg, 2.1 mmol). The mixture was stirred at room temperature for 2Oh. Further sodium triacetoxyborohydride (193mg, 0.91 mmol) was added and stirring continued for 72h. Saturated aqueous sodium hydrogen carbonate solution (5ml) was added and the mixture stirred vigorously for 30min. The mixture was evaporated to dryness under a stream of nitrogen and the residue was partitioned between saturated aqueous sodium hydrogen carbonate solution (5ml) and ethyl acetate (5ml). The phases were separated and the aqueous phase extracted with ethyl acetate (3x 4ml). The combined organic phases were dried (hydrophobic frit) and evaporated to dryness under a stream of nitrogen. The residue was purified by MDAP (Method formate). The required fraction was evaporated under a stream of nitrogen to give 5-(3-{3-[(2/?)-2,3-dihydroxypropyl]- 2,3,4,5-tetrahydro-1 H-3-benzazepin-7-yl}-1 ,2,4-oxadiazol-5-yl)-2-[(1 - methylethyl)oxy]benzonitrile as a white crunchy foam (140mg, 69percent). LCMS (Method formate): Retention time 0.87min, MH+ = 449 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
28% | To a stirred suspension of <strong>[497-09-6]L-(-)-glyceraldehyde</strong> (270mg, 3.0 mmol) and 2-[(1- methylethyl)oxy]-5-[3-(2,3,4,5-tetrahydro-1 H-3-benzazepin-7-yl)-1 ,2,4-oxadiazol-5- yl]-3-pyridinecarbonitrile trifluoroacetate (Preparation 96) (245mg, 0.5 mmol), in DCM (10 ml) under nitrogen, was added acetic acid (0.043ml, 0.75 mmol) followed by sodium triacetoxyborohydride (689mg, 3.3 mmol). The mixture was stirred at room temperature for 1 15h. Saturated aqueous sodium hydrogen carbonate solution (5ml) was added and the reaction stirred vigorously for 15min. The mixture was evaporated to dryness under a stream of nitrogen and the residue partitioned between saturated aqueous sodium hydrogen carbonate solution (5ml) and ethyl acetate (5ml). The aqueous phase was extracted with ethyl acetate (3x 4ml). The combined organic phases were dried (hydrophobic frit) and evaporated to dryness under a stream of nitrogen. The residue was purified by MDAP (Method formate). The required fraction was evaporated under a stream of nitrogen and the residue further purified by MDAP (Method formate, extended run). The required fraction was evaporated under a stream of nitrogen to give 5-(3-{3-[(2S)-2,3-dihydroxypropyl]- 2,3,4,5-tetrahydro-1 H-3-benzazepin-7-yl}-1 ,2,4-oxadiazol-5-yl)-2-[(1 - methylethyl)oxy]-3-pyridinecarbonitrile as a white solid (63mg, 28percent). LCMS (Method formate): Retention time 0.93min, MH+ = 450 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With glycerol phosphate oxidase; Thermus thermophilus HB8 L-fuculose-1-phosphate aldolase; catalase; In water; at 20℃; for 22h;pH 7;Enzymatic reaction; | To a solution of DL-glycerol 3-phosphate magnesium salt (548.78 mg, 2.4 mmol) in 4.7 mL ddH2O was added L-glyceraldehyde (3.3 mL, 0.303 M, 1.0 mmol) at pH 7.0, glycerol phosphate oxidase (70 U, 2 mg), catalase (1000 U, 1.18 muL) and FucAT.HB8 (final concentration 0.5 mg/mL). ddH2O was added to bring the total volume to 10 mL if necessary. The mixture was shaken at rt. for 22 h and the reaction was monitored by TLC (developed by nBuOH/AcOH/H2O 2/1/1 (v/v/v) and stained with anisaldehyde sugar stain). Then YqaB phosphatase (final concentration 0.25 mg/mL) and MgCl2 (final concentration 2.5 mM) was added and the mixture was shaken at 37 °C for 12 h. The purification was performed as described above. After purification by Bio gel P-2 column, a mixture of L-tagatose and L-fructose was obtained (84 mg, 47percent totally). This mixture was isolated as described above to give L-fructose (34.2 mg) and L-tagatose (33.7 mg). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With rabbit 3-hydroxyhexobarbital dehydrogenase (AKR1C29); NADPH; In aq. phosphate buffer; ethyl acetate; at 37℃; for 0.5h;pH 7.4;Enzymatic reaction;Catalytic behavior; Kinetics; | General procedure: The reaction was conducted at 37°C in a 2.0-mL reaction mixture, containing coenzyme (1-mM NADP+ or 0.1-mM NADPH), substrate (0.05?0.1mM), enzyme (0.1?0.3mg), and 0.1-M potassium phosphate, pH 7.4. The substrate and products were extracted into 4-mL ethyl acetate 30min after the reaction was started at 37°C. The products of oxidoreduction of steroids [25] and reduction of PGD2 [28], farnesal [29] and 4-oxo-2-nonenal [18] were analyzed by TLC, as described. The reduced products of TBE were identified by the HPLC methods [23]. The products of 3HB oxidation, 3OB reduction, 5beta-androstane-3alpha,17beta-diol oxidation and 5beta-androstan-3alpha-ol-17-one reduction were analyzed by the liquid chromatography?electrospray ionization-mass spectrometry (LC?ESI-MS) using a Hewlett-Packard HP 1100 Series LC/MSD system attached with a diode array detector and a column (Mightysil RP-18 GP 5mum, 4.6mm×250mm, Kanto Chemical Co., Tokyo, Japan). Separations were carried out at a flow rate of 0.5mL/min and 40°C using the following mobile phases: 25percent acetonitrile aqueous solution containing 0.1percent formic acid for 3OB and alpha/beta-3HBs, and 80percent acetonitrile aqueous solution containing 0.1percent formic acid for the two steroids. 3OB, alpha-3HB, beta-3HB, 5beta-androstan-3alpha-ol-17-one and 5beta-androstane-3alpha,17beta-diol were detected by monitoring their total ions (m/z 249.1, 251.1, 251.1, 289.4 and 291.4, respectively) in the negative ESI mode, and eluted at the retention times of 20.1, 17.6, 16.8, 14.9 and 12.7min, respectively. The detection limits of 3OB, alpha/beta-3HBs and the two steroids were 0.1, 0.1 and 1nmol, respectively. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With glycerol phosphate oxidase; L-rhamnulose-1-phosphate aldolase; catalase; at 20℃; for 22h;pH 7;aq. buffer; Enzymatic reaction; | To a solution of L-glycerol 3-phosphate bis(cyclohexylammonium) salt (370 mg, 1.0 mmol) in 7.56 mL ddH2O was added Dglyceraldehyde (2.44 mL, 0.5 M, 1.22 mmol) at pH 7, glycerol phosphate oxidase (70 U, 2 mg), catalase (1000 U, 1.18 muL) and RhaD (272 muL, final concentration 0.5 mg/mL). The mixture was shaken at rt. for 22 h and the reaction was monitored by TLC (developed by nBuOH/AcOH/H2O 2/1/1 (v/v/v) and stained with anisaldehyde sugar stain). The pH was then adjusted to pH ~5 with 6 N HCl and 11 muL acid phosphatase (18 U) added and the mixture was shaken at 37 °C for another 24 h. After cooling to rt., the pH was adjusted to 7 with 1 N NaOH and the mixture was diluted with methanol. The solution was filtered through Celite and washed with methanol. The filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography (EtOAc/iPrOH/H2O 9/3/1 (v/v/v)) to afford a pale yellow syrup which was further purified by Bio gel P-2 column to afford D-sorbose and D-psicose mixture (87 mg, 48percent totally). The mixture containing D-sorbose and D-psicose only could be isolated as described below. Synthesis of L-fructose was performed with the same procedure using L-glyceraldehyede (66percent yield). NMR data were consistent with ref 11 and authentic sample. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
54% | With FAD; Staphylococcus carnosus D-fructose 1,6-bisphosphate aldolase; Streptococcus pneumonia glycerol phosphate oxidase; In water-d2; at 30℃; for 22h;pH 7;Enzymatic reaction; | General procedure: To a solution of DL-glycerol 3-phosphate magnesium salt (548.78 mg, 2.4 mmol) in 6.86 mL ddH2O was added <strong>[497-09-6]D-glyceraldehyde</strong> (or L-glyceraldehyde) (2 mL, 0.5 M, 1.0 mmol) at pH 7.0, glycerol phosphate oxidase saturated with FAD (final concentration 0.2 mg/mL), catalase (1000 U, 1.18 muL) and aldolase (final concentration 0.5 mg/mL). ddH2O was added to bring the total volume to 10 mL if necessary. The reaction mixture was shaken at 30 °C for 22 h and the reaction was monitored by TLC (developed by nBuOH/AcOH/H2O 2/1/1 (v/v/v) and stained with anisaldehyde sugar stain). The pH was then adjusted to pH ~5 with 6 N HCl and 11 muL acid phosphatase (18 U) was added and the mixture was shaken at 37 °C for 24 h. After cooling to rt., the pH was adjusted to 7.0 with 1 N NaOH and the mixture was diluted with methanol. The solution was filtered through Celite and washed with methanol. The filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography (EtOAc/iPrOH/H2O 9/3/1 (v/v/v)) to afford a pale yellow syrup which was further purified by Bio gel P-2 column. The mixture of monosaccharides could be isolated by Ca2+ exchange resin column. The purification process using P-2 column or Ca2+ exchange resin column was performed with the same procedure we previously used. |
28% | To a solution of DL-glycerol 3-phosphate magnesium salt (548.78 mg, 2.4 mmol) in 6.86 mL ddH2O were added <strong>[497-09-6]D-glyceraldehyde</strong> (or L-glyceraldehyde) (2 mL, 0.5 M, 1.0 mmol) at pH 7.0, glycerol phosphate oxidase (70 U, 2 mg), catalase (1000 U, 1.18 muL), and FruAS.car (final concentration 0.5 mg/mL). ddH2O was added to bring the total volume to 10 mL if necessary. The mixture was shaken at rt for 22 h and the reaction was monitored by TLC (developed by nBuOH/AcOH/H2O: 2/1/1 (v/v/v) and stained with anisaldehyde sugar stain). The pH was then adjusted to pH .similar.5 with 6 M HCl and 11 muL acid phosphatase (18 U) was added and the mixture was shaken at 37 °C for 24 h. After cooling to rt, the pH was adjusted to 7.0 with 1 M NaOH and the mixture was diluted with methanol. The solution was filtered through Celite and washed with methanol. The filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography (EtOAc/iPrOH/H2O: 9/3/1 (v/v/v)) to afford a pale yellow syrup which was further purified by Bio gel P-2 column. After purification, 108 mg d-fructose (60percent yield based on d-glyceraldehyde) and 50.9 mg l-sorbose (28percent yield based on l-glyceraldehyde) were obtained, respectively. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium tris(acetoxy)borohydride; N-ethyl-N,N-diisopropylamine; In 1,2-dichloro-ethane; at 70℃; for 3h; | 4-{(E)-3-[4-(2-Ethyl-5,7-dimethyl-pyrazolo[1,5-a]pyrimidin-3-ylmethyl)-phenyl]-allyl}-piperidin-4-ol (example 3) (100 mg, 0.247 mmol), <strong>[497-09-6](S)-2,3-dihydroxypropanal</strong> (22.3 mg, 0.247 mmol), NaBH(OAc)3 (81 mg, 0.383 mmol) and DIPEA (0.050 ml, 0.287 mmol) were dissolved in 1.5 ml of dichloroethane and stirred for 3 h at 70° C. Then the mixture was diluted with EtOAc, washed with NaCl-solution and dried over Na2 SO4. Evaporation gave a yellow oil. The crude product was purified by chromatography (silica gel, MeOH, EtOAc). LC/MS: 1.75 min (2.1*50 mm, HSS T3 1.8 um at 50° C., 1.2 ml/min, gradient 2-98percent acetonitrile (+0.04percent formic acid) in water (+0.05percent formic acid+3.75 mM NH4OAc); MS (ESI): 479 [M+H]+, 1H-NMR (DMSO-d6, 600 MHz) delta (ppm): 7.26 (d, 2H), 7.12 (d, 2H), 6.76 (s, 1H), 6.33 (d, 1H), 6.28 (m, 1H), 4.55 (br s, 1H), 4.3 (br, 1H), 4.17 (br, 1H), 4.01 (s, 2H), 3.57 (m, 1H), 3.32 (m, 2H), 2.68 (q, 2H), 2.64 (s, 3H), 2.49 (s, 3H), 2.35 (m, 4H), 2.32 (m, 1H), 2.25 (m, 2H), 2.23 (m, 1H), 1.44 (m, 4H), 1.13 (t, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
49% | With FAD; Escherichia coli L-rhamnulose-1-phosphate aldolase; Streptococcus pneumonia glycerol phosphate oxidase; In water-d2; at 30℃; for 22h;pH 7;Enzymatic reaction; | General procedure: To a solution of DL-glycerol 3-phosphate magnesium salt (548.78 mg, 2.4 mmol) in 6.86 mL ddH2O was added <strong>[497-09-6]D-glyceraldehyde</strong> (or L-glyceraldehyde) (2 mL, 0.5 M, 1.0 mmol) at pH 7.0, glycerol phosphate oxidase saturated with FAD (final concentration 0.2 mg/mL), catalase (1000 U, 1.18 muL) and aldolase (final concentration 0.5 mg/mL). ddH2O was added to bring the total volume to 10 mL if necessary. The reaction mixture was shaken at 30 °C for 22 h and the reaction was monitored by TLC (developed by nBuOH/AcOH/H2O 2/1/1 (v/v/v) and stained with anisaldehyde sugar stain). The pH was then adjusted to pH ~5 with 6 N HCl and 11 muL acid phosphatase (18 U) was added and the mixture was shaken at 37 °C for 24 h. After cooling to rt., the pH was adjusted to 7.0 with 1 N NaOH and the mixture was diluted with methanol. The solution was filtered through Celite and washed with methanol. The filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography (EtOAc/iPrOH/H2O 9/3/1 (v/v/v)) to afford a pale yellow syrup which was further purified by Bio gel P-2 column. The mixture of monosaccharides could be isolated by Ca2+ exchange resin column. The purification process using P-2 column or Ca2+ exchange resin column was performed with the same procedure we previously used. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With FAD; Thermus thermophilus HB8 L-fuculose-1-phosphate aldolase; Streptococcus pneumonia glycerol phosphate oxidase; In water-d2; at 30℃; for 22h;pH 7;Enzymatic reaction; | General procedure: To a solution of DL-glycerol 3-phosphate magnesium salt (548.78 mg, 2.4 mmol) in 6.86 mL ddH2O was added <strong>[497-09-6]D-glyceraldehyde</strong> (or L-glyceraldehyde) (2 mL, 0.5 M, 1.0 mmol) at pH 7.0, glycerol phosphate oxidase saturated with FAD (final concentration 0.2 mg/mL), catalase (1000 U, 1.18 muL) and aldolase (final concentration 0.5 mg/mL). ddH2O was added to bring the total volume to 10 mL if necessary. The reaction mixture was shaken at 30 °C for 22 h and the reaction was monitored by TLC (developed by nBuOH/AcOH/H2O 2/1/1 (v/v/v) and stained with anisaldehyde sugar stain). The pH was then adjusted to pH ~5 with 6 N HCl and 11 muL acid phosphatase (18 U) was added and the mixture was shaken at 37 °C for 24 h. After cooling to rt., the pH was adjusted to 7.0 with 1 N NaOH and the mixture was diluted with methanol. The solution was filtered through Celite and washed with methanol. The filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography (EtOAc/iPrOH/H2O 9/3/1 (v/v/v)) to afford a pale yellow syrup which was further purified by Bio gel P-2 column. The mixture of monosaccharides could be isolated by Ca2+ exchange resin column. The purification process using P-2 column or Ca2+ exchange resin column was performed with the same procedure we previously used. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With mesoporous Zr-SBA-15; at 240℃; under 20686.5 Torr; for 1h;Inert atmosphere; | General procedure: Reactions were carried out in a 100 mL stirred Parr micro reactor,whereby the catalyst was suspended in a solution of biomasssubstrate in methanol (20 mL) and the reactor was charged with400 psi N2 initially and then heated at a ramp rate of 10 °C/minuntil the desired set temperature was reached. During the reaction,mixing was achieved through an internal propeller operating at 700 RPM. Once the set temperature was attained, the reactorwas held for the set reaction time, and then quenched quickly inan ice bath to stop the reaction. The reactor was cooled toapproximately 25 °C before being vented after the gas pressurewas recorded. The reactor was then immediately broken downand the solid residue remaining in the reactor was recovered anddried. The aqueous and solid fractions were separated using acentrifuge |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium periodate; sodium hydrogencarbonate; In dichloromethane; at 20℃; | To a stirred solution of diacetonoid (11) (6 g) in DCM (60 mL),sat. NaHCO3 solution (2 mL) and NaIO4 (3.3 g) was added portionwise in 2e3 min. The reaction mixture was stirred for 2 h at RT.After 2 h, anhydrous sodium sulphate (2 g) was added and thereaction mixture was stirred for 1 h at RT. After completion of reaction time, the reaction mixture was filtered through vacuum filterand filtrate was concentrated on rotary evaporator at 28 C withcool water circulation. The crude (S)-()-glyceraldehyde was dissolved in ethyl acetate (40 mL) and ethanol (5 mL) followed bygradual addition of NaBH4 (0.65 g) at 0 C. This reaction mixturewas stirred at RT for 3 h. At that stage, acetone was added (5 mL) at0 C and allowed to stir at RT for 15 min. Then the reaction mixturewas cooled to 0 C and saturated NH4Cl solution was added dropwise with the dropper until there was no more evolution ofhydrogen gas. After this quenching process, the reaction mixturewas transferred to a separating funnel. The two layers were separated, from this the organic layer was separated and the aqueouslayer was extracted with diethyl ether twice. The combined organiclayers were washed with brine solution and dried over anhydrousNa2SO4 and concentrated under vaccum at 45 C to obtain a crudeproduct. The crude product was purified by silica gel columnchromatography using a solvent mixture of hexane: EtOAc (4: 1, v/v) to obtain a title compound (2.56 g, 85percent) with oil like characteristics. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
2.56 g | To a stirred solution of diacetonoid (11) (6 g) in DCM (60 mL),sat. NaHCO3 solution (2 mL) and NaIO4 (3.3 g) was added portionwise in 2e3 min. The reaction mixture was stirred for 2 h at RT.After 2 h, anhydrous sodium sulphate (2 g) was added and thereaction mixture was stirred for 1 h at RT. After completion of reaction time, the reaction mixture was filtered through vacuum filterand filtrate was concentrated on rotary evaporator at 28 C withcool water circulation. The crude (S)-()-glyceraldehyde was dissolved in ethyl acetate (40 mL) and ethanol (5 mL) followed bygradual addition of NaBH4 (0.65 g) at 0 C. This reaction mixturewas stirred at RT for 3 h. At that stage, acetone was added (5 mL) at0 C and allowed to stir at RT for 15 min. Then the reaction mixturewas cooled to 0 C and saturated NH4Cl solution was added dropwise with the dropper until there was no more evolution ofhydrogen gas. After this quenching process, the reaction mixturewas transferred to a separating funnel. The two layers were separated, from this the organic layer was separated and the aqueouslayer was extracted with diethyl ether twice. The combined organiclayers were washed with brine solution and dried over anhydrousNa2SO4 and concentrated under vaccum at 45 C to obtain a crudeproduct. The crude product was purified by silica gel columnchromatography using a solvent mixture of hexane: EtOAc (4: 1, v/v) to obtain a title compound (2.56 g, 85percent) with oil like characteristics. 1H NMR (300 MHz, CDCl3) d 4.19e4.27 (m, 1H), 4.04 (t,J 8.1 Hz, 1H), 3.78 (t, J 8.1 Hz, 1H), 3.69 (d, J 11.3 Hz, 1H), 3.59(dd, J 4.9, 11.1 Hz, 1H), 2.9(Bs, OH), 1.43 (s, 3H), 1.37 (s, 3H); 13CNMR (125 MHz, CDCl3) d 109.2, 76.1, 65.6, 62.8, 26.5, 25.1; IR (CHCl3)3420, 2987, 2936, 2884, 1457, 1372, 1214, 1157, 1051, 845 cm1;Specific rotation: [a ]D 20 ()10.28, (C 5, MeOH). |
Tags: 497-09-6 synthesis path| 497-09-6 SDS| 497-09-6 COA| 497-09-6 purity| 497-09-6 application| 497-09-6 NMR| 497-09-6 COA| 497-09-6 structure
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