cyclohexane-1,4-diol

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:0.00; pressure:0.00; stir:

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

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

Procedure: Prepared analogously to III.1 from 3.6 g 2-fluoro-3-nitropyridine and 2.9 g 1,4-cyclohexanediol

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

Procedure: Prepared analogously to III.1 from 3.6 g 2-fluoro-3-nitropyridine and 2.9 g 1,4-cyclohexanediol.

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

Procedure: To a stirred mixture of 46.46 parts of 1,4-cyclohexanediol and 135 parts of N,N-dimethylformamide were added 5.28 parts of sodium hydride dispersion 50% at a temperature below 20° C. Stirring was continued for 2 hours at room temperature under nitrogen atmosphere. Then there were added dropwise 15.9 parts of 1,4-difluoro-2-nitrobenzene at about 20° C. Upon completion, stirring was continued overnight at room temperature. The reaction mixture was poured onto water. The precipitated product was filtered off and taken up in trichloromethane. The solution was washed with water, dried, filtered and evaporated. The residue was boiled in 2-propanol. Upon cooling, the precipitate was filtered off and the filtrate was evaporated. The residue was purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (95:5 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was stirred in petroleumether. The product was filtered off and dried, yielding 17.1 parts of 4-(4-fluoro-2-nitrophenoxy)cyclohexanol; mp. 150.8° C. (intermediate 85). Upon completion, stirring was continued overnight at room temperature The reaction mixture was poured onto water The precipitated product was filtered off The solution was washed with water dried filtered evaporated Upon cooling the precipitate was filtered off the filtrate was evaporated The residue was purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (95:5 by volume) as eluent The pure fractions were collected the eluent was evaporated The residue was stirred in petroleumether The product was filtered off dried

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

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

Procedure: To a stirred mixture of 46.46 parts of 1,4-cyclohexanediol and 135 parts of N,N-dimethylformamide were added 5.28 parts of sodium hydride dispersion 50% at a temperature below 20° C. Stirring was continued for 2 hours at room temperature under nitrogen atmosphere. Then there were added dropwise 15.9 parts of 1,4-di-fluoro-2-nitrobenzene at about 20° C. Upon completion, stirring was continued overnight at room temperature. The reaction mixture was poured onto water. The precipitated product was filtered off and taken up in trichloromethane. The solution was washed with water, dried, filtered and evaporated. The residue was boiled in 2-propanol. Upon cooling, the precipitate was filtered off and the filtrate was evaporated. The residue was purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (95:5 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was stirred in petroleumether. The product was filtered off and dried, yielding 17.1 parts of 4-(4-fluoro-2-nitrophenoxy)cyclohexanol; mp. 150.8° C. (intermediate 85). Upon completion, stirring was continued overnight at room temperature The reaction mixture was poured onto water The precipitated product was filtered off The solution was washed with water dried filtered evaporated Upon cooling the precipitate was filtered off the filtrate was evaporated The residue was purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (95:5 by volume) as eluent The pure fractions were collected the eluent was evaporated The residue was stirred in petroleumether The product was filtered off dried

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

Procedure: To a solution of 1,4-cyclohexanediol (5 g, 43 mmol), imidazole (2.92 g, 43 mmol) and NEt3 (7 mL) in CH2Cl2 (100 mL) cooled in an ice bath was added tert-butyldimethylsilyl chloride (6.47 g, 43 mmol). The mixture was stirred at room temperature overnight. Water was added and the organic phase was separated. The aqueous layer was extracted with EtOAc. The combined organic phase was dried over MgSO4 and concentrated. Chromatography on silica gel eluting with 3:1 EtOAc/hexanes provided the title compound (4.2 g, 42%) as an oil. MS calculated (M+H)+ 231, found 231. the organic phase was separated The aqueous layer was extracted with EtOAc The combined organic phase was dried over MgSO4 concentrated

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

Procedure: To a solution of 1,4-cyclohexanediol (5 g, 43 mmol), imidazole (2.92 g, 43 mmol) and NEt3 (7 mL) in CH2Cl2 (100 mL) cooled in an ice bath was added tert-butyldimethylsilyl chloride (6.47 g, 43 mmol). The mixture was stirred at room temperature overnight. Water was added and the organic phase was separated. The aqueous layer was extracted with EtOAc. The combined organic phase was dried over MgSO4 and concentrated. Chromatography on silica gel eluting with 3:1 EtOAc/hexanes provided the title compound (4.2 g, 42%) as an oil. MS calculated (M+H)+ 231, found 231. the organic phase was separated The aqueous layer was extracted with EtOAc The combined organic phase was dried over MgSO4 concentrated