2-(Tert-butyldiphenylsilanyloxy)ethanol

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

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Magnesium trifluoromethanesulfonate (3.95 g, 12.24 mmol) was added in one portion to (S)-methyl oxirane-2-carboxylate (5 g, 48.98 mmol) and 2-(tert-butyldiphenylsilyloxy)ethanol (14.72 g, 48.98 mmol) at 10° C. The resulting suspension was stirred at 10° C. for 10 minutes and then warmed to 45° C. and stirred for 3 days. The crude product was purified by flash silica chromatography, eluting with 0 to 30% ethyl acetate in isohexane to afford the product (8.50 g, 43.1%). 1H NMR (400 MHz, CDCl3) δ 1.05 (9H, s), 3.10 (1H, d), 3.62 (2H, t), 3.74-3.87 (7H, m), 4.26-4.34 (1H, m), 7.35-7.46 (6H, m), 7.63-7.71 (4H, m); m/z (ESI+) (M+Na)+=425.37; HPLC tR=3.15 min. warmed to 45° C. stirred for 3 days The crude product was purified by flash silica chromatography eluting with 0 to 30% ethyl acetate in isohexane

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

Procedure: 60% Oily sodium hydride (510 mg) was suspended in N,N-dimethylformamide (70 ml), followed by addition of 2-(t-butyldiphenysilyoxy)ethanol (3.83 g). The mixture was stirred at room temperature for 1 hour, followed by addition of 6-chloro[1,2,4]triazolo[1,5-b]pyridazine (1.98 g). The mixture was stirred at room temperature for 5 hours and poured into ice-water, followed by extraction with ethylether. The extract was washed with an aqueous sodium chloride solution, dried over magnesium sulfate and concentrated under reduced pressure. The residue was dissolved in tetrahydrofuran (40 ml), followed by addition of tetra-n-butylammoniumfluoride trihydrate (2.02 g). The mixture was stirred at room temperature for 10 minutes and concentrated under reduced pressure. The residue was subjected to silica-gel column chromatography and eluted with a mixture of ethyl acetate and hexane (1:1). Fractions containing the objective compound were collected and concentrated to yield the title compound (0.875 g). The mixture was stirred at room temperature for 5 hours followed by extraction with ethylether The extract was washed with an aqueous sodium chloride solution dried over magnesium sulfate concentrated under reduced pressure The residue was dissolved in tetrahydrofuran (40 ml) followed by addition of tetra-n-butylammoniumfluoride trihydrate (2.02 g) The mixture was stirred at room temperature for 10 minutes concentrated under reduced pressure eluted with a mixture of ethyl acetate and hexane (1:1) Fractions containing the objective compound were collected concentrated

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

Procedure: 60% Oily sodium hydride (510 mg) was suspended in N,N-dimethylformamide (70 ml), followed by addition of 2-(t-butyldiphenysilyoxy)ethanol (3.83 g). The mixture was stirred at room temperature for 1 hour, followed by addition of 6-chloro[1,2,4]triazolo[1,5-b]pyridazine (1.98 g). The mixture was stirred at room temperature for 5 hours and poured into ice-water, followed by extraction with ethylether. The extract was washed with an aqueous sodium chloride solution, dried over magnesium sulfate and concentrated under reduced pressure. The residue was dissolved in tetrahydrofuran (40 ml), followed by addition of tetra-n-butylammoniumfluoride trihydrate (2.02 g). The mixture was stirred at room temperature for 10 minutes and concentrated under reduced pressure. The residue was subjected to silica-gel column chromatography and eluted with a mixture of ethyl acetate and hexane (1:1). Fractions containing the objective compound were collected and concentrated to yield the title compound (0.875 g). The mixture was stirred at room temperature for 5 hours followed by extraction with ethylether The extract was washed with an aqueous sodium chloride solution dried over magnesium sulfate concentrated under reduced pressure The residue was dissolved in tetrahydrofuran (40 ml) followed by addition of tetra-n-butylammoniumfluoride trihydrate (2.02 g) The mixture was stirred at room temperature for 10 minutes concentrated under reduced pressure eluted with a mixture of ethyl acetate and hexane (1:1) Fractions containing the objective compound were collected concentrated

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

Procedure: Into a 2-L 3-necked round-bottom flask was placed tetrahydrofuran (800 mL), ethane-1,2-diol (40 g, 644.46 mmol, 1.00 equiv) and imidazole (61.4 g, 901.92 mmol, 1.40 equiv). This was followed by the addition of TBDPSCl (186.3 g) dropwise with stirring at 0° C. in 30 min. The resulting solution was stirred overnight at room temperature. The solids were filtered out, and the filtrate cake was washed with 200 mL of EA. The resulting mixture was washed with 200 mL of brine and concentrated under vacuum. The residue was applied onto a silica gel column with ethyl acetate/petroleum ether (1:25). Purification afforded 83 g (43%) of 2-[(tert-butyldiphenylsilyl)oxy]ethan-1-ol (85.2) as a colorless oil. Into a 2-L 3-necked round-bottom flask was placed The resulting solution was stirred overnight at room temperature The solids were filtered out the filtrate cake was washed with 200 mL of EA The resulting mixture was washed with 200 mL of brine concentrated under vacuum Purification

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

Procedure: 10.0 g (36.4 mmol) of chloro-tert-butyl(diphenyl)silane dissolved in 88 ml of tetrahydrofuran were added dropwise over a period of 6 h to a solution of 10.1 ml (182 mmol) of 1,2-ethanediol and 2.97 g (43.7 mmol) of imidazole in 12 ml of tetrahydrofuran, and the mixture was then stirred further at RT overnight. The solvent was removed under reduced pressure and the residue was purified by flash chromatography (340 g silica cartridge, 100 ml/min, cyclohexane/ethyl acetate gradient). Yield: 8.34 g (76% of theory) The solvent was removed under reduced pressure the residue was purified by flash chromatography (340 g silica cartridge, 100 ml/min, cyclohexane/ethyl acetate gradient)

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

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

Procedure: 10.0 g (36.4 mmol) of chloro-tert-butyl(diphenyl)silane dissolved in 88 ml of tetrahydrofuran were added dropwise over a period of 6 h to a solution of 10.1 ml (182 mmol) of 1,2-ethanediol and 2.97 g (43.7 mmol) of imidazole in 12 ml of tetrahydrofuran, and the mixture was then stirred further at RT overnight. The solvent was removed under reduced pressure and the residue was purified by flash chromatography (340 g silica cartridge, 100 ml/min, cyclohexane/ethyl acetate gradient). Yield: 8.34 g (76% of theory) The solvent was removed under reduced pressure the residue was purified by flash chromatography (340 g silica cartridge, 100 ml/min, cyclohexane/ethyl acetate gradient)

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

Procedure: (1R,2R)-2-[[trans-2-[(1E,3E)-4-(4-Cyano-2-fluorophenyl)-1,3-butadienyl]-1,3-dioxan-5-yl]thio]-1-(2,4-difluorophenyl)-1-[(1H-1,2,4-triazol-1-yl)methyl]propyl imidazole-1-carboxylate (637 mg, 1.00 mmol) obtained from Example 15-(1) and the crude 2-[(tert-butyldiphenylsilyl)oxy]ethanol (315 mg, ca. 1.05 mmol) obtained from Example 15-(2) were dissolved in dichloromethane (3 ml), and potassium tert-butoxide (5 mg) was added thereto. The mixture was heated under reflux for 15 minutes with stirring. After cooling, a phosphate buffer solution (pH 7) was poured into the mixture, and the reaction product was extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified by recycle preparative HPLC [LC-908; Japan Analytical Industry Co., Ltd.; GPC column JAIGEL-1H (20 mm i.d.×600 mm) and JAIGEL-2H (20 mm i.d.×600 mm) connected in series for use; solvent, chloroform] to afford the title compound (631.4 mg, 73% yield) as a colorless amorphous solid. The mixture was heated under reflux for 15 minutes After cooling the reaction product was extracted with ethyl acetate The organic layer was dried over anhydrous magnesium sulfate the solvent was distilled off under reduced pressure The residue was purified by recycle preparative HPLC [LC-908; Japan Analytical Industry Co., Ltd.; GPC column JAIGEL-1H (20 mm i.d.×600 mm) and JAIGEL-2H (20 mm i.d.×600 mm) connected in series for use; solvent, chloroform]

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

Procedure: Commercially available 2-hydroxyethyl acetate (3.12 g, 30.0 mmol), triethylamine (4.6 ml, 33 mmol), and 4-(N,N-dimethylamino)pyridine (100 mg) were dissolved in dichloromethane (20 ml), then tert-butylchlorodiphenylsilane (8.65 g, 31.5 mmol) was added thereto at room temperature, and the mixture was stirred for 20 hours. The obtained solution was diluted with a mixed solvent of hexane-ethyl acetate (1:1), and then the resulting solution was washed with water and with an aqueous solution of sodium chloride. The solution was dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The residue was dissolved in methanol (100 ml), and 28% sodium methoxide in methanol (3 ml) was added thereto at room temperature followed by stirring for 2 hours. The solvent was distilled off under reduced pressure, and the residue was partitioned between ethyl acetate and a phosphate buffer solution (pH 7), then the organic layer was washed with an aqueous solution of sodium chloride and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to afford the crude title compound (5.18 g, 57% gross yield) as a colorless oil. the resulting solution was washed with water and with an aqueous solution of sodium chloride The solution was dried over anhydrous magnesium sulfate the solvent was distilled off under reduced pressure The residue was dissolved in methanol (100 ml) 28% sodium methoxide in methanol (3 ml) was added at room temperature by stirring for 2 hours The solvent was distilled off under reduced pressure the residue was partitioned between ethyl acetate a phosphate buffer solution (pH 7), then the organic layer was washed with an aqueous solution of sodium chloride dried over anhydrous magnesium sulfate The solvent was distilled off under reduced pressure

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 5-[(2,5-Difluorophenyl)[(4-fluorophenyl)sulfonyl]meth yl]-N-(1-hydroxymethyl)-4-methylpyridine-2-carboxamide (113 mg, 0.251 mmol) obtained in Example 85, and a solution of 2-(tert-butyldiphenylsilyloxy)ethanol (136 mg, 0.453 mmol) and p-toluenesulfonic acid (10 mg) in benzene (5 ml) were stirred for 3 hours with heating to 60° C. The reaction solution was returned to room temperature, and then was concentrated under reduced pressure. Ethyl acetate was added to the resulting concentration residue, and the mixture was washed sequentially with saturated aqueous sodium hydrogencarbonate and saturated brine. The organic layer was dried over anhydrous sodium sulfate and filtered, and then the filtrate was concentrated under reduced pressure. The resulting concentration residue was subjected to flash silica gel column chromatography, and the fraction obtained from an elution with 25% ethyl acetate/hexane was concentrated under reduced pressure, to obtain the title compound (93 mg, 0.127 mmol, 51%) as an amorphous substance. was returned to room temperature was concentrated under reduced pressure Ethyl acetate was added to the resulting concentration residue the mixture was washed sequentially with saturated aqueous sodium hydrogencarbonate and saturated brine The organic layer was dried over anhydrous sodium sulfate filtered the filtrate was concentrated under reduced pressure The resulting concentration residue the fraction obtained from an elution with 25% ethyl acetate/hexane was concentrated under reduced pressure

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

Procedure: 60% Oily sodium hydride (510 mg) was suspended in N,N-dimethylformamide (70 ml), followed by addition of 2-(t-butyldiphenylsilyloxy)ethanol (3.83 g). The mixture was stirred at room temperature for 1 hour, followed by addition of 6-chloro[1,2,4]triazolo[1,5-b]pyridazine (1.98 g). The mixture was stirred at room temperature for 5 hours and poured into ice-water, followed by extraction with ethyl ether. The extract was washed with an aqueous sodium chloride solution, dried over magnesium sulfate and concentrated under reduced pressure. The residue was dissolved in tetrahydrofuran (40 ml), followed by addition of tetra-n-butylammoniumfluoride trihydrate (2.02 g). The mixture was stirred at room temperature for 10 minutes and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography and eluted with a mixture of ethyl acetate and hexane (1:1). Fractions containing the objective compound were collected and concentrated to yield the title compound (0.875 g). The mixture was stirred at room temperature for 5 hours followed by extraction with ethyl ether The extract was washed with an aqueous sodium chloride solution dried over magnesium sulfate concentrated under reduced pressure The residue was dissolved in tetrahydrofuran (40 ml) followed by addition of tetra-n-butylammoniumfluoride trihydrate (2.02 g) The mixture was stirred at room temperature for 10 minutes concentrated under reduced pressure eluted with a mixture of ethyl acetate and hexane (1:1) Fractions containing the objective compound were collected concentrated