N-bis(phenylmethoxy)phosphanyl-N-propan-2-ylpropan-2-amine

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the product of step (j) (2.0 g, 4.4 mmol), dibenzyl diisopropylphosphoramidite (2.28 g, 6.6 mmol), tetrazole (0.92 g, 13.2 mmol) and 4-dimethylaminopyridine (50 mg) in dichloromethane (30 ml) was heated under reflux for 13 hours. The reaction mixture was cooled (0° C.) and m-chloroperbenzoic acid (1.52 g, 8.8 mmol) added. The solution was stirred at 0° C. for a further hour then allowed to warm to room temperature. The reaction mixture was washed with aqueous sodium sulphite solution (10%, 30 ml), saturated sodium bicarbonate solution (30 ml) and brine (30 ml). The organic layer was dried (Na2SO4) and solvent was evaporated in vacuo to give an oil. Purification by column chromatography (silica gel, 45 g, eluting with toluene to 3.5% diethylamine in toluene gradient) gave the required product as a colourless oil (0.8 g, 27%), m/z 671 (M++1). 1H N.M.R. (CDCl3) δ=1.3 (d, 3H); 3.8 (s, 3H); 3.85 (q, 1H); 4.8 (m, 2H); 4.9 (m, 2H), 5.2 (s, 2H); 6.25 (s, 1H); 6.6 (m, 1H); 6.8 (m, 1H); 7.05 (m, 1H); 7.15 (m, 2H); 7.2-7.35 (m, 12H); 7.5 (s,1H); 7.8 (s,1H); 8.23 (s,1H). under reflux for 13 hours added to warm to room temperature The reaction mixture was washed with aqueous sodium sulphite solution (10%, 30 ml), saturated sodium bicarbonate solution (30 ml) and brine (30 ml) The organic layer was dried (Na2SO4) and solvent was evaporated in vacuo to give an oil Purification by column chromatography (silica gel, 45 g, eluting with toluene to 3.5% diethylamine in toluene gradient)

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the product of step (j) (2.0 g, 4.4 mmol), dibenzyl diisopropylphosphoramidite (2.28 g, 6.6 mmol), tetrazole (0.92 g, 13.2 mmol) and 4-dimethylaminopyridine (50 mg) in dichloromethane (30 ml) was heated under reflux for 13 hours. The reaction mixture was cooled (0° C.) and m-chloroperbenzoic acid (1.52 g, 8.8 mmol) added. The solution was stirred at 0° C. for a further hour then allowed to warm to room temperature. The reaction mixture was washed with aqueous sodium sulphite solution (10%, 30 ml), saturated sodium bicarbonate solution (30 ml) and brine (30 ml). The organic layer was dried (Na2SO4) and solvent was evaporated in vacuo to give an oil. Purification by column chromatography (silica gel, 45 g, eluting with toluene to 3.5% diethylamine in toluene gradient) gave the required product as a colourless oil (0.8 g, 27%), m/z 671 (M++1). 1H N.M.R. (CDCl3) δ=1.3 (d, 3H); 3.8 (s, 3H); 3.85 (q, 1H); 4.8 (m, 2H); 4.9 (m, 2H), 5.2 (s, 2H); 6.25 (s, 1H); 6.6 (m, 1H); 6.8 (m, 1H); 7.05 (m, 1H); 7.15 (m, 2H); 7.2-7.35 (m, 12H); 7.5 (s,1H); 7.8 (s,1H); 8.23 (s,1H). under reflux for 13 hours added to warm to room temperature The reaction mixture was washed with aqueous sodium sulphite solution (10%, 30 ml), saturated sodium bicarbonate solution (30 ml) and brine (30 ml) The organic layer was dried (Na2SO4) and solvent was evaporated in vacuo to give an oil Purification by column chromatography (silica gel, 45 g, eluting with toluene to 3.5% diethylamine in toluene gradient)

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 3-[4-(4-Cyanophenyl)thiazol-2-yl]-2-(2,4-difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol (Example 88, EP 0667346, 900 mg, 2.06 mmol), 1H-tetrazole (432 mg, 6.18 mmol), 4-dimethylaminopyridine (100 mg, 0.82 mmol) and dibenzyl diisopropylphosphoramidite (1.42 g, 4.12 mmol) in methylene chloride (10 ml) were refluxed under a nitrogen atmosphere for 20 hours. The mixture was then cooled to 0° C., and hydrogen peroxide (2.5 ml, 30% solution in water) was added dropwise maintaining the temperature below 20° C. The resulting mixture was stirred at 20° C. for 30 minutes before separating the organic layer, which was washed with water, dried (MgSO4) and the solvent evaporated. The resulting pale yellow oil was purified by column chromatography (silica gel, eluting with ethyl acetate/hexane) to give the subtitle compound as a viscous syrup (732 mg, 51%). maintaining the temperature below 20° C before separating the organic layer, which was washed with water dried (MgSO4) the solvent evaporated The resulting pale yellow oil was purified by column chromatography (silica gel, eluting with ethyl acetate/hexane)

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 3-[4-(4-Cyanophenyl)thiazol-2-yl]-2-(2,4-difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol (Example 88, EP 0667346, 900 mg, 2.06 mmol), 1H-tetrazole (432 mg, 6.18 mmol), 4-dimethylaminopyridine (100 mg, 0.82 mmol) and dibenzyl diisopropylphosphoramidite (1.42 g, 4.12 mmol) in methylene chloride (10 ml) were refluxed under a nitrogen atmosphere for 20 hours. The mixture was then cooled to 0° C., and hydrogen peroxide (2.5 ml, 30% solution in water) was added dropwise maintaining the temperature below 20° C. The resulting mixture was stirred at 20° C. for 30 minutes before separating the organic layer, which was washed with water, dried (MgSO4) and the solvent evaporated. The resulting pale yellow oil was purified by column chromatography (silica gel, eluting with ethyl acetate/hexane) to give the subtitle compound as a viscous syrup (732 mg, 51%). maintaining the temperature below 20° C before separating the organic layer, which was washed with water dried (MgSO4) the solvent evaporated The resulting pale yellow oil was purified by column chromatography (silica gel, eluting with ethyl acetate/hexane)

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-(2,4-Difluorophenyl)-1-{3-[(E)-4-(2,2,3,3-tetrafluoropropoxy)styryl]-1H-1,2,4-triazol-1-yl}-3-(1H-1,2,4-triazol-1-yl) propan-2-ol (the racemate of Example 19, EP 0472392, 475 mg, 0.88 mmol), 1H-tetrazole (185 mg, 2.64 mmol) and dibenzyl diisopropylphosphoramidite (607 mg, 1.76 mmol) in methylene chloride (5 ml) was stirred at room temperature under a nitrogen atmosphere for 20 hours. The mixture was then cooled to 0° C., and hydrogen peroxide (1.0 ml, 30% solution in water) was added dropwise maintaining the temperature below 20° C. The resulting mixture was stirred at 20° C. for 30 minutes before separating the organic layer, which was washed with water, dried (MgSO4) and the solvent evaporated. The resulting pale yellow oil was purified by column chromatography (silica gel, eluting with ethyl acetate/hexane) to give the subtitle compound as a viscous syrup (595 mg, 84%). maintaining the temperature below 20° C before separating the organic layer, which was washed with water dried (MgSO4) the solvent evaporated The resulting pale yellow oil was purified by column chromatography (silica gel, eluting with ethyl acetate/hexane)

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-(2,4-Difluorophenyl)-1-{3-[(E)-4-(2,2,3,3-tetrafluoropropoxy)styryl]-1H-1,2,4-triazol-1-yl}-3-(1H-1,2,4-triazol-1-yl) propan-2-ol (the racemate of Example 19, EP 0472392, 475 mg, 0.88 mmol), 1H-tetrazole (185 mg, 2.64 mmol) and dibenzyl diisopropylphosphoramidite (607 mg, 1.76 mmol) in methylene chloride (5 ml) was stirred at room temperature under a nitrogen atmosphere for 20 hours. The mixture was then cooled to 0° C., and hydrogen peroxide (1.0 ml, 30% solution in water) was added dropwise maintaining the temperature below 20° C. The resulting mixture was stirred at 20° C. for 30 minutes before separating the organic layer, which was washed with water, dried (MgSO4) and the solvent evaporated. The resulting pale yellow oil was purified by column chromatography (silica gel, eluting with ethyl acetate/hexane) to give the subtitle compound as a viscous syrup (595 mg, 84%). maintaining the temperature below 20° C before separating the organic layer, which was washed with water dried (MgSO4) the solvent evaporated The resulting pale yellow oil was purified by column chromatography (silica gel, eluting with ethyl acetate/hexane)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of (2R,3S)-2-(2,4-difluorophenyl)-3-(5-fluoro-4-pyrimidinyl)-1-(1H-1,2,4-triazol-1-yl) butan-2-ol (the compound of Example 7, EP 0440372, also known as voriconazole, 17.0 g, 48.7 mmol), 4-dimethylaminopyridine (10.2 g, 83.5 mmol), 1H-tetrazole (10.2 g, 146 mmol) and dibenzyl diisopropylphosphoramidite (33.6 g, 97.4 mmol) in methylene chloride (100 ml) was stirred at reflux for 2 hours and a further 16 hours at room temperature under a nitrogen atmosphere. The reaction mixture was then washed with hydrochloric acid and then sodium bicarbonate, dried (MgSO4) and concentrated. The crude product phosphite was purified by column chromatography (silica gel, 300 g, eluting with 3:1 to 1:1 hexane:ethyl acetate gradient) to give a pale yellow oil. This was dissolved in methylene chloride (100 ml) and cooled to −10° C., whereupon a solution of 3-chloroperoxybenzoic acid (14.8 g, 57% w/w, 46.9 mmol) in methylene chloride (100 ml) was added maintaining the temperature below 0° C. The resulting mixture was allowed to warm to room temperature for 10 minutes before washing with aqueous sodium metabisulphite and sodium bicarbonate. After drying (MgSO4) and concentrating the crude product was purified by column chromatography (silica gel, 300 g, eluting with ethyl acetate) to give the subtitle compound as a viscous syrup (17.86 g, 60%). The reaction mixture was then washed with hydrochloric acid sodium bicarbonate, dried (MgSO4) concentrated The crude product phosphite was purified by column chromatography (silica gel, 300 g, eluting with 3:1 to 1:1 hexane:ethyl acetate gradient) to give a pale yellow oil was added maintaining the temperature below 0° C to warm to room temperature for 10 minutes before washing with aqueous sodium metabisulphite and sodium bicarbonate After drying (MgSO4) concentrating the crude product was purified by column chromatography (silica gel, 300 g, eluting with ethyl acetate)

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To diBoc-1-ethyl-3-[6-fluoro-5-[2-(1-hydroxy-1-methyl-ethyl)pyrimidin-5-yl]-7-[(2R)-tetrahydrofuran-2-yl]-1H-benzimidazol-2-yl]urea (28) (1.13 g, 1.797 mmol) and tetrazole (251.8 mg, 3.594 mmol) at 23° C. under N2 was added DCM (30 mL) followed by N-dibenzyloxyphosphanyl-N-isopropyl-propan-2-amine (744.7 mg, 724.4 μL, 2.156 mmol). After stirring for 18 h, the reaction was cooled to 0° C. then treated with mCPBA (531.5 mg, 2.156 mmol). The reaction was stirred for 15 min at 0° C., then for 30 min at 23° C. The resulting solution was then partitioned between EtOAc and saturated aqueous sodium bicarbonate (300 mL each), the organic layer separated, then washed with 10% aqueous sodium bisulfite, saturated aqueous sodium bicarbonate and brine (300 mL each), then dried over magnesium sulfate filtered and concentrated. The residue was purified by MPLC using an ISCO COMBIFLASH brand flash chromatography purification system (80 g silica column) eluting with a 0-80% EtOAc in hexanes linear gradient over 20 column volumes at 60 mL/min flow rate. Desired product fractions were combined and evaporated to give diBoc-1-ethyl-3-[6-fluoro-5-[2-(1-hydroxy-1-methyl-ethyl)pyrimidin-5-yl]-7-[(2R)-tetrahydrofuran-2-yl]-1H-benzimidazol-2-yl]urea dibenzyl phosphate (29) (1.03 g, 1.159 mmol, 64.50%) as a clear, glassy oil. ESMS (M+1)=889.5; 1H NMR (300.0 MHz, CDCl3) δ 8.93 (d, J=1.5 Hz, 2H), 8.31 (s, 1H), 8.04 (d, J=6.4 Hz, 1H), 7.36-7.26 (m, 10H), 5.83-5.70 (m, 1H), 5.16-5.05 (m, 4H), 4.24-4.18 (m, 1H), 4.03-3.97 (m, 1H), 3.42-3.36 (m, 2H), 2.43-2.05 (m, 4H), 1.98 (s, 6H), 1.64 (s, 9H), 1.40 (s, 9H) and 1.26 (t, J=7.2 Hz, 3H) ppm. The reaction was stirred for 15 min at 0° C. for 30 min at 23° C The resulting solution was then partitioned between EtOAc and saturated aqueous sodium bicarbonate (300 mL each) the organic layer separated washed with 10% aqueous sodium bisulfite, saturated aqueous sodium bicarbonate and brine (300 mL each) dried over magnesium sulfate filtered concentrated The residue was purified by MPLC an ISCO COMBIFLASH brand flash chromatography purification system (80 g silica column) eluting with a 0-80% EtOAc in hexanes linear gradient over 20 column volumes at 60 mL/min flow rate evaporated

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To Boc-1-ethyl-3-[6-fluoro-5-[2-(1-hydroxy-1-methyl-ethyl)pyrimidin-5-yl]-7-[(2R)-tetrahydrofuran-2-yl]-1H-benzimidazol-2-yl]urea (25) (12.69 g, 23.58 mmol) and tetrazole (3.304 g, 47.16 mmol) under N2 at 23° C. was added DCM (240 mL) followed by N-dibenzyloxyphosphanyl-N-isopropyl-propan-2-amine (9.775 g, 9.509 mL, 28.30 mmol). After 3 hours at 23° C., the reaction was cooled to 0° C. then mCPBA (6.977 g, 28.30 mmol) was added. The resulting solution was stirred for 45 min at 0° C. then for 20 min at 23° C. The reaction mixture was then partitioned between DCM (50 mL) and saturated aqueous sodium bicarbonate (400 mL). The organic layer was separated, then washed successively with aqueous sodium bisulfite (63 g in 350 mL water) and saturated aqueous sodium bicarbonate (400 mL), then dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by MPLC using an ISCO COMBIFLASH brand flash chromatography purification system (330 g silica column) eluting with a 0-100% EtOAc in hexanes linear gradient over 16 column volumes at 200 mL/min. Product containing fractions were evaporated in vacuo to give Boc-1-ethyl-3-[6-fluoro-5-[2-(1-hydroxy-1-methyl-ethyl)pyrimidin-5-yl]-7-[(2R)-tetrahydrofuran-2-yl]-1H-benzimidazol-2-yl]urea dibenzyl phosphate (26) (11.92 g, 15.11 mmol, 64.09%). ESMS (M+1)=789.2; 1H NMR (300.0 MHz, CDCl3) δ 9.51 (s, 1H), 9.03 (t, J=5.4 Hz, 1H), 8.91 (d, J=1.6 Hz, 2H), 7.73 (d, J=6.5 Hz, 1H), 7.37-7.28 (m, 10H), 5.58 (t, J=7.8 Hz, 1H), 5.17-5.05 (m, 4H), 4.23 (t, J=7.5 Hz, 1H), 4.05 (td, J=7.8, 4.3 Hz, 1H), 3.53-3.44 (m, 2H), 2.39 (dd, J=7.9, 14.5 Hz, 2H), 2.28-2.15 (m, 2H), 1.98 (s, 6H), 1.72 (m, 9H) and 1.31 (t, J=7.2 Hz, 3H) ppm. for 20 min at 23° C The reaction mixture was then partitioned between DCM (50 mL) and saturated aqueous sodium bicarbonate (400 mL) The organic layer was separated washed successively with aqueous sodium bisulfite (63 g in 350 mL water) and saturated aqueous sodium bicarbonate (400 mL) dried over magnesium sulfate filtered concentrated in vacuo The residue was purified by MPLC an ISCO COMBIFLASH brand flash chromatography purification system (330 g silica column) eluting with a 0-100% EtOAc in hexanes linear gradient over 16 column volumes at 200 mL/min Product containing fractions were evaporated in vacuo