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H-D-Ala-OBzl·TosOH is an amino acid derivative that serves as an important intermediate in peptide synthesis and organic synthesis.
Synonyms: H-D-Ala-OBzl.TosOH
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Batch number can be found on the product's label following the word 'Batch'.
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CAS No. : | 41036-32-2 |
Formula : | C17H21NO5S |
M.W : | 351.42 |
SMILES Code : | O=S(C1=CC=C(C)C=C1)(O)=O.C[C@@H](N)C(OCC2=CC=CC=C2)=O |
Synonyms : |
H-D-Ala-OBzl.TosOH
|
MDL No. : | MFCD00039092 |
InChI Key : | NWOPHJSSBMABBD-DDWIOCJRSA-N |
Pubchem ID : | 2802425 |
GHS Pictogram: |
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Signal Word: | Warning |
Hazard Statements: | H302-H315-H319-H335 |
Precautionary Statements: | P261-P305+P351+P338 |
* 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 |
---|---|---|
With sodium tris(acetoxy)borohydride; triethylamine; In 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran; at 20℃; for 168h; | EXAMPLE 76 Step A: D-alanine benzylester p-toluenesulfonic acid salt (22mg, 0. 062MMOL), triethylamine (9. 0muL, 0. 062MMOL), and sodium triacetoxyborohydride (22mg, 0. LOMMOL) were added to a stirring solution of 1-((1R,3S)-3-isopropyl-3-[6-(trifluoromethyl)-2H-1, 3-benzoxazin-3 (4H)- yl] carbonyl} cyclopentyl) piperidin-4-one (19MG, 0.021mmol) in DCM (LOML). The reaction mixture was stirred at rt for 96h, however, the reaction had not gone to completion. Another 39mg (0. 1 LMMOL) OF L- alanine BENZYLESTERP-TOLUENESULFONIC acid salt and 15, UL (0. 1 LMMOL) of triethylamine was added to the reaction mixture. After stirring for an additional 72h at rt, the reaction mixture was diluted with dichloromethane (50ML), washed with sodium bicarbonate solution (1 x 50ML) and brine (1 x 50ML), dried over magnesium sulfate, filtered, and concentrated under reduced pressure. Purification by preparatory TLC (silica gel, 0. 25% ammonium hydroxide, 2.25% MeOH, 97.5% DCM) afforded the desired product. ESI-MS calculated for C33H42F3N304 : 601. 70, found 602 (M + H). | |
With sodium tris(acetoxy)borohydride; triethylamine; In dichloromethane; at 20℃; for 168h; | Step A: D-alanine benzylester p-toluenesulfonic acid salt (22 mg, 0.062 mmol), triethylamine (9.0 muL, 0.062 mmol), and sodium triacetoxyborohydride (22 mg, 0.10 mmol) were added to a stirring solution of 1-((1R,3S)-3-isopropyl-3-[6-(trifluoromethyl)-2H-1,3-benzoxazin-3(4H)-yl]carbonyl}cyclopentyl)piperidin-4-one (19 mg, 0.021 mmol) in DCM (10 mL). The reaction mixture was stirred at rt for 96 h, however, the reaction had not gone to completion. Another 39 mg (0.11 mmol) of L-alanine benzylester p-toluenesulfonic acid salt and 15 muL (0.11 mmol) of triethylamine was added to the reaction mixture. After stirring for an additional 72 h at rt, the reaction mixture was diluted with dichloromethane (50 mL), washed with sodium bicarbonate solution (1×50 mL) and brine (1×50 mL), dried over magnesium sulfate, filtered, and concentrated under reduced pressure. Purification by preparatory TLC (silica gel, 0.25% ammonium hydroxide, 2.25% MeOH, 97.5% DCM) afforded the desired product. ESI-MS calculated for C33H42F3N3O4: 601.70. found 602 (M+H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With benzotriazol-1-ol; In ethyl acetate; N,N-dimethyl-formamide; | Example 14 Dibenzylphosphoryl-L-alanyl-L-prolyl-D-alanine L-arginine salt: Dibenzylphosphoryl-L-alanyl-L-proline (1.4 g, 3.2 m mole), HOBt (476 mg, 3.5 m mole) and D-alanine benzylester p-toluene sulfonic acid salt (1.3 g, 3.5 m mole) were dissolved in DMF (5 ml), and WSC (0.64 ml) was added thereto while cooling to -15 C. The reaction was carried out for 3 hours under cooling and then overnight at room temperature. To the reaction solution ethyl acetate (100 ml) was added and the mixture was washed with 1N hydrochloric acid, 5% sodium bicarbonate and water in order. The mixture was dried with anhydrous sodium sulfate and the thus obtained solution was distilled under reduced pressure to give an oily dibenzylphosphoryl-L-alanyl-L-prolyl-D-alanine benzylester material. | |
With benzotriazol-1-ol; In ethyl acetate; N,N-dimethyl-formamide; | EXAMPLE 14 Dibenzylphosphoryl-L-alanyl-L-prolyl-D-alanine L-arginine salt: Dibenzylphosphoryl-L-alanyl-L-proline (1.4 g, 3.2 m mole), HOBt (476 mg, 3.5 m mole) and D-alanine benzylester p-toluene sulfonic acid salt (1.3 g, 3.5 m mole) were dissolved in DMF (5 ml), and WSC (0.64 ml) was added thereto while cooling to -15 C. The reaction was carried out for 3 hours under cooling and then overnight at room temperature. To the reaction solution ethyl acetate (100 ml) was added and the mixture was washed with 1N hydrochloric acid, 5% sodium bicarbonate and water in order. The mixture was dried with anhydrous sodium sulfate and the solvent was distilled off under reduced, pressure to give oily dibenzylphosphoryl-L-alanyl-L-prolyl-D-alanine benzylester. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
7% | With dicyclohexyl-carbodiimide; In water; tert-butyl alcohol; | EXAMPLE 6 General Procedure monobasic Salts The appropriate amino acid ester (7 mol equivalent) was added to a solution of the nucleoside 5'-monophosphate species (1 mol equivalent) and DCC (5 mol. equivalent) in tert-BuOH (5 mL) and H2O (2 mL) and the resulting mixture was stirred and heated at reflux for 4 h. The solvent was removed in vacuo to afford the desired salt which was purified as described. ; step 2-azido-cytidine 5'-O-(benzyloxy-D-alaninyl)phosphate The title compound was prepared as described in Example 5 utilizing azido-cytidine monophosphate (100 mg, 0.294 mmol), <strong>[41036-32-2]D-alanine benzyl ester tosylate</strong> salt (14m 368.83 mg, 2.058 mmol), DCC (302.82 mg, 1.47 mmol) in tert-BuOH (5 mL) and H2O. The crude was purified by column chromatography eluting with a gradient starting from iso-PrOH, to iso-PrOH/conc. NH4OH/H2O (90:7:3, 85:10:5 and 80:12:8) to I-68 afford a white solid (7.8 mg, 0.0139 mmol, 7%). 31P NMR (D2O): delta6.52; 1H NMR (D2O): delta7.63 (1H, d, H6-cytidine, J=7.8 Hz), 7.25 (5H, CH-benzyl), 5.91 (1H, d, H1'-cytidine, J=3.0 Hz), 5.86 (1H, d, H5-cytidine, J=7.8 Hz), 5.00 (2H, s, CH2-benzyl), 4.25-4.13 (2H, m, H2'-cytidine, H3'-cytidine), 3.84 (2H, m, CH2 (2H, m, H5'-cytidine), 3.71 (1H, m, CHalpha), 1.37 (3H, d, CH3-lateral chain); MS (ES) m/e: 524.0 (M-, 100%); Accurate mass: C19H23N7O9P required 524.1295 found 524.1295. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
78% | Ozone gas was passed into a mixture of 2,5-dihydrofuran (1.994 g, 28.46 mmol), methanol (24 ml_),DCM (100 mL) at -60C,(containing a trace of sudan red), until the red colour disappeared leaving a greyish solution. After removal of excess ozone with nitrogen, sodium cyanotrihydroborate (1.252 g, 19.92 mmol) was added to the solution and the mixture stirred at -500C for 10mins. A solution benzyl (2R)-2-aminopropanoate p-toluenesulfonate salt (5 g, 14.23 mmol) in methanol (10OmL) was added dropwise and the stirring continued at 00C overnight. Acetic acid (0.815 mL, 14.23 mmol) was added and the mixture evaporated. The residue was dissolved in DCM (20OmL) and washed with saturated aqueous NaHCO3 solution. The organic extracts were dried over Na2SO4, filtered and evaporated to an oil. The crude product was purified by flash silica chromatography, elution gradient 15 to 50% EtOAc in isohexane. Pure fractions were evaporated to dryness to afford benzyl (2R)-2-morpholin- 4-ylpropanoate (2.75 g, 78 %) as a orange oil; m/z: 250.17 (MH+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
51% | With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine; In dichloromethane; at 20℃; for 24h; | III. Dipeptides for absolute configuration determination and alpha/gamma-peptide studies.A number of alpha/gamma-dipeptides were prepared using Fmoc-AMCP and standard coupling reagents. However, all proved recalcitrant to crystallization from a wide range of solvent mixtures via slow evaporation. Boc-AMCP was therefore obtained and dipeptides using either D or L forms of Alanine benzyl ester tosylate were prepared (Scheme 5-3). Scheme 5-3. (a) Coupling of Boc-AMCP to LAla-OBn tosylate; (b) Coupling of Boc-AMCP to DAla-OBn tosylate.BocNH-AMCP-DAla-OBnThe couplings proceeded in moderate yields to provide useful amounts of both dipeptides. The dipeptides were isolated and several crystallization trials were set up using slow evaporation from mixtures of chloroform, ethyl acetate, methanol, heptane, and pentane. A mixture of ethyl acetate and heptane yielded large needles for the Boc-NH-AMCP-DAla-OBn dipeptide. These diffracted into the space group PI and the X-ray crystal structure was solved. The absolute configuration of the AMCP residue was shown to be (R,R) for the ring stereocenters, resulting from the Michael addition using the (S) catalyst. The relative configuration of the stereocenters is trans. |