* 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.
A stirred mixture of dimethylphosphite (10.0 ml, 109 mniol), triethylamine (1.5 ml, 10.9 mmol) and paraformaldehyde (3.26 g) was heated in an oil bath at 100 °C (external temperature). After 2.5 hours the mixture was cooled to room temperature, concentrated in vacua and the residue was purified by flash column chromatography (eluent: ethyl acetate/methanol 95:5) to provide the title compound as a colourless oil (9.41 g, 62percent).'H NMR (400 MHz, CDC13) 5 ppm 4.32 (1H, br s), 3.95 (2H, d, J6 Hz), 3.83 (3H, s) and 3.81 (3H,s).31P{1H} NMR (400.1 MHz, CDC13) 5 ppm 27.8.13C NMR (100.6 MHz, CDC13) 8 ppm 53.5, 56.0 and 57.6.
Reference:
[1] Journal of Polymer Science, Part A: Polymer Chemistry, 2012, vol. 50, # 12, p. 2432 - 2443
[2] Chemistry - A European Journal, 2009, vol. 15, # 9, p. 2064 - 2070
[3] Patent: WO2006/20779, 2006, A2, . Location in patent: Page/Page column 77
[4] Organic Letters, 2012, vol. 14, # 18, p. 4798 - 4801
[5] Bioorganic and Medicinal Chemistry, 1998, vol. 6, # 3, p. 315 - 322
[6] Phosphorus, Sulfur and Silicon and Related Elements, 1999, vol. 144-146, p. 633 - 636
[7] Phosphorus, Sulfur and Silicon and Related Elements, 2002, vol. 177, # 5, p. 1137 - 1145
[8] Journal of the American Chemical Society, 2006, vol. 128, # 3, p. 885 - 897
[9] Patent: US2008/207563, 2008, A1, . Location in patent: Page/Page column 23
[10] Phosphorus, Sulfur and Silicon and the Related Elements, 2009, vol. 184, # 11, p. 2777 - 2785
[11] Phosphorus, Sulfur and Silicon and the Related Elements, 2012, vol. 187, # 1, p. 135 - 141
[12] Journal of Polymer Science, Part A: Polymer Chemistry, 2011, vol. 49, # 18, p. 3905 - 3910
[13] Phosphorus, Sulfur and Silicon and the Related Elements, 2014, vol. 189, # 6, p. 812 - 818
[14] Patent: CN103980315, 2016, B, . Location in patent: Paragraph 0044-0046
2
[ 50-00-0 ]
[ 96-36-6 ]
[ 24630-67-9 ]
Reference:
[1] J. Gen. Chem. USSR (Engl. Transl.), 1988, vol. 58, # 5, p. 1032[2] Zhurnal Obshchei Khimii, 1988, vol. 58, # 5, p. 1160
[3] Patent: US2007/197617, 2007, A1, . Location in patent: Page/Page column 24
(R)-tert-Butoxycarbonylamino-[4-(dimethoxy-phosphorylmethoxy)-phenyl]-acetic acid was prepared as follows:; (1) Dimethyl phosphite (2.0 g, 18.2 mmol), paraformaldehyde (574 mg, 19.1 mmol) and triethylamine (0.25 mL, 1.8 mmol) were combined and heated to 70 C. to give a clear solution. After 1 hour the reaction was cooled and concentrated in vacuo overnight to afford the crude hydroxymethyl-phosphonic acid dimethyl ester (2.5 g).
With 2,6-dimethylpyridine; In dichloromethane; at -50 - 0℃; for 1.5h;
Trifluoromethanesulfonic anhydride (4.7 ml, 27.8 mmol) was added in a dropwise manner to a stirred solution of dimethy phosphonic ester alcohol (3.54 g, 25.3 mmol) and 2,6-lutidene (3.5 ml, 30.3 mmol) in dichloromethane (30 ml) ensuring that the internal temperature remained below -50 C. Once the addition was complete the mixture was slowly warmed to 0 C over approximately 90 minutes. Diethyl ether (150 ml) was then added and the resultant suspension was filtered through celite andwashed with diethyl ether (20 ml). The solution was then sequentially washed with water (90 ml), 1M hydrochloric acid (90 ml) and brine (90 ml). After drying (NaaSC^), filtration followed by concentration provided the title compound as a light yellow oil (5.67 g, 83%) which was used without further purification.'H NMR (400 MHz, CDC13) 8 ppm 4.87 (2H5 d, J9 Hz), 3.91 (3H, s) and 3.89 (3H, s)19F{.H} NMR (376.5 MHz, CDC13) 8 ppm -74.531P{JH} NMR (400.1 MHz, CDC13) 8 ppm 16.1
53%
With pyridine; In dichloromethane; at -20 - 0℃; for 0.5h;
(2) To a solution of <strong>[24630-67-9]hydroxymethyl-phosphonic acid dimethyl ester</strong> (2.0 g, 14.5 mmol) in anhydrous dichloromethane (50 mL) at -20 C. was added pyridine (1.4 mL, 16.7 mmol) followed by trifluoromethanesulfonic anhydride (2.7 mL, 15.9 mmol). After stirring at 0 C. for 0.5 hours, the mixture was filtered through celite with a thin layer of silica gel. The filtrate was washed with cold 1.0 N aqueous hydrochloric acid, water, saturated aqueous sodium bicarbonate and dried over sodium sulfate. The solvents were removed to give trifluoro-methanesulfonic acid dimethoxy-phosphorylmethyl ester as an oil (2.1 g, 53%).
In dichloromethane; at -78 - 20℃; for 1h;
A solution of dimethoxyphosphorylmethanol (1 g) in dichloromethane (20 mL) was cooled to -78C and 2,6-Lutidine (1.32 mL) followed by trifluoromethylsulfonyl trifluoromethanesulfonate (1.91g) was added. The resulting reaction mixture was allowed to warm to room temperature and stirred for 1 hour. The reaction mixture was poured into water and extracted with dichloromethane (50 mL). The organic layer was washed with 1 M aqueous hydrochloric acid (50 mL), dried over anhydrous sodium sulfate and concentrated to give dimethoxyphosphorylmethyl trifluoromethanesulfonate as a pale yellow liquid. 1 H NMR (400 MHz, de-DMSO) 4.82 (d, 2H) 3.78 (s, 3H) 3.74 (s, 3H)
[(3S,5R)-3-(tert-Butyl-dimethyl-silanyloxy)-2-iodomethyl-5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-2-yloxymethyl]-phosphonic acid dimethyl ester[ No CAS ]
[(3S,5R)-2-Bromomethyl-3-(tert-butyl-dimethyl-silanyloxy)-5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-2-yloxymethyl]-phosphonic acid diisopropyl ester[ No CAS ]
[(3S,5R)-3-(tert-Butyl-diphenyl-silanyloxy)-2-iodomethyl-5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-2-yloxymethyl]-phosphonic acid dimethyl ester[ No CAS ]
A stirred mixture of dimethylphosphite (10.0 ml, 109 mniol), triethylamine (1.5 ml, 10.9 mmol) and paraformaldehyde (3.26 g) was heated in an oil bath at 100 C (external temperature). After 2.5 hours the mixture was cooled to room temperature, concentrated in vacua and the residue was purified by flash column chromatography (eluent: ethyl acetate/methanol 95:5) to provide the title compound as a colourless oil (9.41 g, 62%).'H NMR (400 MHz, CDC13) 5 ppm 4.32 (1H, br s), 3.95 (2H, d, J6 Hz), 3.83 (3H, s) and 3.81 (3H,s).31P{1H} NMR (400.1 MHz, CDC13) 5 ppm 27.8.13C NMR (100.6 MHz, CDC13) 8 ppm 53.5, 56.0 and 57.6.
With triethylamine; at 70℃; for 1h;
Dimethyl phosphite (2.0 g, 18.2 mmol), paraformaldehyde (574 mg, 19.1 mmol) and triethylamine (0.25 mL, 1.8 mmol) were combined and heated to 70 C. to give a clear solution. After 1 hour the reaction was cooled and concentrated in vacuo overnight to afford the crude hydroxymethyl-phosphonic acid dimethyl ester (2.5 g).
With potassium carbonate; In methanol; at 0 - 20℃; for 1h;
In the first step, 1.75 g (55 mmol) of paraformaldehyde was dissolved in 50 mL of methanol, 0.63 g (4.54 mmol) of potassium carbonate was added and the solution was cooled to 0 C. 5.0 g (45.4 mmol) of phosphorous acid And the temperature was raised to room temperature. After 1 h, the potassium carbonate was filtered off and the filtrate was removed under reduced pressure to give a colorless oil as Intermediate I;
1.38 g of anhydrous potassium carbonate,6.01g of paraformaldehyde and 100ml of methanol were sequentially added to the reflux condenser equipped withMagnetic stirrer inside the three-necked flask of the thermometer,After stirring for 10 minutes, dimethyl phosphite (22.01g) was added dropwise to the three-necked flask.Control the dripping speed to avoid the reaction solution from boiling. After the dropwise addition is complete, react for one hour at room temperature;After the reaction is completed, the remaining potassium carbonate particles are removed by filtration, and the solvent is removed by rotary evaporation. Then,Put in vacuum oven, 60 , 12h,The obtained colorless transparent liquid is the product dimethyl methyl phosphinate.
With pyridine; In dichloromethane; at -20 - 0℃; for 0.5h;
To a solution of <strong>[24630-67-9]hydroxymethyl-phosphonic acid dimethyl ester</strong> (2.0 g, 14.5 mmol) in anhydrous dichloromethane (50 mL) at -20 C. was added pyridine (1.4 mL, 16.7 mmol) followed by trifluoromethanesulfonic anhydride (2.7 mL, 15.9 mmol). After stirring at 0 C. for 0.5 hours, the mixture was filtered through celite with a thin layer of silica gel. The filtrate was washed with cold 1.0 N aqueous hydrochloric acid, water, saturated aqueous sodium bicarbonate and dried over sodium sulfate. The solvents were removed to give trifluoro-methanesulfonic acid dimethoxy-phosphorylmethyl ester as an oil (2.1 g, 53%).
53%
(2) To a solution of <strong>[24630-67-9]hydroxymethyl-phosphonic acid dimethyl ester</strong> (2.0 g, 14.5 mmol) in anhydrous dichloromethane (50 mL) at -20 C. was added pyridine (1.4 mL, 16.7 mmol) followed by trifluoromethanesulfonic anhydride (2.7 mL, 15.9 mmol). After stirring at 0 C. for 0.5 hours, the mixture was filtered through celite with a thin layer of silica gel. The filtrate was washed with cold 1.0 N aqueous hydrochloric acid, water, saturated aqueous sodium bicarbonate and dried over sodium sulfate. The solvents were removed to give trifluoro-methanesulfonic acid dimethoxy-phosphorylmethyl ester as an oil (2.1 g, 53%).
Dimethyl phosphite (2.0 g, 18.2 mmol), paraformaldehyde (574 mg, 19.1 mmol) and triethylamine (0.25 mL, 1.8 mmol) were combined and heated to 70 C. to give a clear solution. After 1 hour the reaction was cooled and concentrated in vacuo overnight to afford the crude hydroxymethyl-phosphonic acid dimethyl ester (2.5 g).
With triphenylphosphine; diethylazodicarboxylate; In tetrahydrofuran; at 20℃; for 48h;
METHOD C. PREPARATION OF TERT-BUTYL (4,7-DICHLORO-5-METHYL-1-BENZOTHIEN-2-YL)-SULFONYL)DIMETHOXY PHOSPHORYL)METHYL)CARBAMATETo a stirred solution of the carbamate (820 mg, 2.07 mmol, 1 eq) in anhydrous tetrahydrofuran (50 mL) at room temperature was added dimethyl hydroxymethylphosphonate (350 mg, 2.48 mmol, 1.20 eq) followed by triphenylphosphine (1.1 g, 4.1 mmol, 2.0 eq) and diethyl azodicarboxylate (0.70 mL, 4.4 mmol, 2.1 eq). After 48 h the reaction mixture was diluted with ethyl acetate (100 mL) and the organic phase was washed with sodium hydroxide (1N, 100 mL), dried over sodium sulfate and concentrated. The residue was purified by flash chromatography on silica gel (ethyl acetate/dichloromethane: 4:96) then dried under high vacuum to afford the product.1H NMR (400 MHz, CDCl3) delta (ppm): 8.26 (s, 1H), 7.40 (s, 1H), 4.33 (d, J=9.6 Hz, 2H), 3.83 (s, 3H), 3.80 (s, 3H), 2.52 (s, 3H), 1.49 (s, 9H); MS m/z 540 (M+Na) [(major isotope].
General procedure: A solution of methylphosphonate (2 mmol, 2 equiv) in anhydrous THF (3 ml) is cooled down to -78C under nitrogen and n-BuLi (2.2 mmol, 2.5 M in hexane, 0.9 mL, 2.2 equiv) is added dropwise. The solution is stirred at -78C for 1 hour then the phosphorus electrophile P(O)(OR) (1 mmol, 1 equiv) in THF (1 ml) is added via a syringe. After 1 hour, the solution is warmed up to rt then stirred for an additional 2 hours.
General procedure V. (R)-(((5-(4-chlorophenyl)-1-ethyl-4-(3-(4-(4-(4-((4-(4-hydroxypiperidin-1-yl)-1-(phenylthio)butan-2-yl)amino)-3-((trifluoromethyl) sulfonyl)phenylsulfonamido)phenyl)piperazin-1-yl)phenyl)-2-methyl-1H-pyrrole-3-carbonyl)oxy)methyl)phosphonic acid (8) To a solution of BM-957 (100 mg, 0.09 mmol), DIC (18 mg, 0.14 mmol) and DMAP (20 mg, 0.14 mmol) in DCM (2 mL) was added <strong>[24630-67-9]dimethyl (hydroxymethyl)phosphonate</strong> (40 mg, 0.28 mmol). The solution was stirred for 6 hours at room temperature until no BM-957 was observed by TLC. The reaction mixture was diluted with ethyl acetate (50 mL), washed with saturated NaHCO3 solution (50 mL), brine (50 mL) and dried over sodium sulfate. The solvent was removed in vacuo to give crude product which was used for next step without purification. The resulting residue was dissolved in DCM (5 mL) and followed by adding TMSBr (248 uL, 1.9 mmol). The solution was stirred at room temperature for 20 h until no starting material was observed by MS. The reaction mixture was concentrated in vacuo and the residue was purified by HPLC to give the pure product 8 (salt with TFA, 74 mg, yield 68% over two steps). The gradient ran from 60% of solvent A and 40% of solvent B to 20% of solvent A and 80% of solvent B in 40 min. 1H NMR (300 M Hz, CD3OD): delta 7.92 (s, 1H), 7.73-7.70 (m, 2H), 7.34-6.82 (m, 17H), 4.28 (d, J=8.6 Hz, 2H), 4.06-3.35 (m, 14H), 3.20-2.92 (m, 5H), 2.65 (s, 3H), 2.24-1.67 (m, 6H), 1.10 (t, J=7.0 Hz, 3H). MS (ESI): m/z 1259.50 (M+H)+.
General procedure: 1-hydroxylalkylphosphonates 2 were obtained by the general method of our previously published papers.9-11 To a three-necked flask, compounds 2 (0.005 mol), 4,6-dichloro-2-isocyanatopyrimidine 5 (0.005 mol), and 1,2-dichloroethane (15 mL) were added. The resulting mixture was stirred at ambient temperature about 15 min, and then evaporated.The residue was chromatographed on silica gel using acetone-petroleum ether (1:2) as the eluent to afford the pure title compounds 6a-p as solid in 61%-81% yields.
In the third step, 3.69 g (0.01 mol) of Intermediate II was dissolved in 70 mL of acetone, and an acetone solution containing 1.68 g (0.012 mol) of Intermediate I was slowly added dropwise at room temperature. After completion of the dropwise addition, the mixture was heated to 50 C The aqueous solution was extracted with methylene chloride, and the organic phase was combined with MgSO, and the aqueous solution was extracted with methylene chloride. The organic phase was extracted with MgSO4Drying, filtering, and finally by rotary evaporation under reduced pressure to obtain a white viscous liquid, and finally in a vacuum oven at 40 to constant weight to obtain a white solid, that is, containing triazine ring phosphorus - nitrogen - silicon compounds.
With sodium carbonate; In water; at 0 - 5℃; for 4h;
(1) 500 ml three-necked flask,Add 50 grams of 37% aqueous formaldehyde solution, 3.0 grams of sodium carbonate,Cool down to 0 C,60 g of diethyl phosphite was added dropwise, and the temperature of the dropping process was maintained between 0 and 5 C.After 2 hours, after the addition,The reaction solution was obtained by keeping at 2 C for 2 hours. Sampling test,The diethyl phosphite was 0.12% (less than 0.2%) and the reaction was completed.
With sodium hydroxide; In dichloromethane; at 5 - 10℃; for 3h;
(2) 100 ml of dichloromethane and 78.7 g of p-toluenesulfonyl chloride were added to the above reaction solution.Cool down to 5 C, add 30% of liquid alkali 63.8 grams, the reaction is exothermic,Keep the dropping temperature between 5-10 C, and add 1 hour.After the addition is completed, the temperature is kept at 10 C for 2 hours, and the sample is tested.The reaction of 0.15% (less than 0.2%) of p-toluenesulfonyl chloride is completed.Still, layer, the aqueous layer was extracted once with 50 ml of dichloromethane.Combine the layers and add 100 ml of water to wash once.The water layer is separated; the layer is firstly distilled to recover dichloromethane.The residual dichloromethane was then dried under reduced pressure.Residue 115.1 g of diethyl p-toluenesulfonyloxymethylphosphonate,99.3% purity,The molar yield (calculated as p-toluenesulfonyl chloride) was 86.5%.