1-chloro-2-(diethoxyphosphorylmethyl)benzene

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

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

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Sodium hydride (60%, 26 mg, 0.66 mmole) was added to a solution of 101 mg. (0.33 mol) of 17-keto-4-methyl-5α-androstan-3-one (F) and 173 mg (0.66 mol) of diethyl 2-chlorobenzylphosphonate in 1.0 ml of dry DMF at room temperature. The mixture was heated at 70° C. in a nitrogen atmosphere with stirring for 110 minutes, cooled, poured into 0.5N HCl (20 ml) and extracted with methylene chloride (3×). The organic phases were combined, washed with water (3×), saturated NaCl solution and dried over magnesium sulfate. The organic phase was concentrated under reduced pressure to yield a tan, gummy solid. Flash chromatography of the crude solid was conducted on a silica gel 60×20 mm column, and eluted with 4:1 methylene chloride/acetone in 6 ml. fractions. Fractions 18-24 contained the product which were combined and evaporated to yield a white solid, mp 205°-208° C., yielding one spot on silica gel TLC using 4:1 methylene chloride/acetone. The proton NMR confirmed the assigned structure for 39. at room temperature cooled extracted with methylene chloride (3×) washed with water (3×), saturated NaCl solution dried over magnesium sulfate The organic phase was concentrated under reduced pressure to yield a tan, gummy solid eluted with 4:1 methylene chloride/acetone in 6 ml evaporated to yield a white solid, mp 205°-208° C. yielding one spot on silica gel TLC

Conditions: temp:3.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: At 3° C., a solution of diethyl 2-chlorobenzylphosphonate (2.00 g, 7.61 mmol) in dry DMF (30 ml) was added to a stirred suspension of sodium hydride (60% by weight suspension in mineral oil, 365 mg, 9.13 mmol; freshly washed with dry heptane) in dry DMF (20 ml). After 1 h of stirring at 3° C., a solution of 2′,4′-difluoroacetophenone (1.31 g, 8.37 mmol) in dry DMF (20 ml) was added dropwise. The resulting mixture was stirred at RT for 68 h and then diluted with water and extracted with diethyl ether. The organic phase was dried and concentrated to dryness under reduced pressure, and the residue was purified by chromatography on silica gel, which gave 1-[1-(2-chlorophenyl)prop-1-en-2-yl]-2,4-difluorobenzene as a 93/7 mixture of diastereoisomers [colourless solid, 560 mg, yield 26%; GC/MS: m/z=264 (M+); HPLC/MS: log P(HCOOH)=5.05 (major diastereoisomer), 5.34 (minor diastereoisomer)]. freshly washed with dry heptane) in dry DMF (20 ml) The resulting mixture was stirred at RT for 68 h extracted with diethyl ether The organic phase was dried concentrated to dryness under reduced pressure the residue was purified by chromatography on silica gel, which

Conditions: temp:3.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: At 3° C., a solution of diethyl 2-chlorobenzylphosphonate (2.00 g, 7.61 mmol) in dry DMF (30 ml) was added to a stirred suspension of sodium hydride (60% by weight suspension in mineral oil, 365 mg, 9.13 mmol; freshly washed with dry heptane) in dry DMF (20 ml). After 1 h of stirring at 3° C., a solution of 2′,4′-difluoroacetophenone (1.31 g, 8.37 mmol) in dry DMF (20 ml) was added dropwise. The resulting mixture was stirred at RT for 68 h and then diluted with water and extracted with diethyl ether. The organic phase was dried and concentrated to dryness under reduced pressure, and the residue was purified by chromatography on silica gel, which gave 1-[1-(2-chlorophenyl)prop-1-en-2-yl]-2,4-difluorobenzene as a 93/7 mixture of diastereoisomers [colourless solid, 560 mg, yield 26%; GC/MS: m/z=264 (M+); HPLC/MS: log P(HCOOH)=5.05 (major diastereoisomer), 5.34 (minor diastereoisomer)]. freshly washed with dry heptane) in dry DMF (20 ml) The resulting mixture was stirred at RT for 68 h extracted with diethyl ether The organic phase was dried concentrated to dryness under reduced pressure the residue was purified by chromatography on silica gel, which

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

Procedure: To a solution of diethyl 2-chlorobenzylphosphonate (4.91 g, 0.018 mol) and 7-bromo-5-methoxybenzofuran-2-carbaldehyde (11.27 g, 0.016 mol) in tetrahydrofuran (80 mL) was added sodium hydride (60% dispersion in mineral oil, 0.74 g, 0.0185 mol). After 5 min. the reaction mixture was warmed to 60° C. for 1 h. The reaction mixture was cooled to room temperature, water (10 mL) was carefully added and the tetrahydrofuran was removed. Water (50 mL) was added and the mixture was extracted with ethyl acetate (3×100 mL). The combined ethyl acetate extracts were washed with brine (50 mL), dried over magnesium sulphate, filtered and concentrated to dryness. Trituration with diethyl ether (20 mL) gave solid material which was further washed with diethyl ether (20 ml). The liquors were concentrated and triturated with diethyl ether (10 mL), the solid being collected. The combined solids gave (859) (4.89 g, 84%). 1H NMR δ (CDCl3) 7.70 (d, J=16 Hz, 1H), 7.65 (dd, J=7.7, 1.5 Hz, 1H), 7.4 (dd, J=6.0, 1 Hz, 1H), 7.23 (m, 2H), 7.05 (d, J=2.3 Hz, 1H), 6.94 (d, J=16 Hz, 1H), 6.92 (d, J=2.3 Hz, 1H), 6.72 (s, 1H), 3.82 (s, 3H); MH+:364.9, 362.9 MH−:362.9, 360.9. The reaction mixture was cooled to room temperature the tetrahydrofuran was removed Water (50 mL) was added the mixture was extracted with ethyl acetate (3×100 mL) The combined ethyl acetate extracts were washed with brine (50 mL) dried over magnesium sulphate filtered concentrated to dryness Trituration with diethyl ether (20 mL) gave solid material which was further washed with diethyl ether (20 ml) The liquors were concentrated triturated with diethyl ether (10 mL) the solid being collected

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

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

Procedure: To a solution of diethyl 2-chlorobenzylphosphonate (4.91 g, 0.018 mol) and 7-bromo-5-methoxybenzofuran-2-carbaldehyde (11.27 g, 0.016 mol) in tetrahydrofuran (80 mL) was added sodium hydride (60% dispersion in mineral oil, 0.74 g, 0.0185 mol). After 5 min. the reaction mixture was warmed to 60° C. for 1 h. The reaction mixture was cooled to room temperature, water (10 mL) was carefully added and the tetrahydrofuran was removed. Water (50 mL) was added and the mixture was extracted with ethyl acetate (3×100 mL). The combined ethyl acetate extracts were washed with brine (50 mL), dried over magnesium sulphate, filtered and concentrated to dryness. Trituration with diethyl ether (20 mL) gave solid material which was further washed with diethyl ether (20 ml). The liquors were concentrated and triturated with diethyl ether (10 mL), the solid being collected. The combined solids gave (859) (4.89 g, 84%). 1H NMR δ (CDCl3) 7.70 (d, J=16 Hz, 1H), 7.65 (dd, J=7.7, 1.5 Hz, 1H), 7.4 (dd, J=6.0, 1 Hz, 1H), 7.23 (m, 2H), 7.05 (d, J=2.3 Hz, 1H), 6.94 (d, J=16 Hz, 1H), 6.92 (d, J=2.3 Hz, 1H), 6.72 (s, 1H), 3.82 (s, 3H); MH+:364.9, 362.9 MH−:362.9, 360.9. The reaction mixture was cooled to room temperature the tetrahydrofuran was removed Water (50 mL) was added the mixture was extracted with ethyl acetate (3×100 mL) The combined ethyl acetate extracts were washed with brine (50 mL) dried over magnesium sulphate filtered concentrated to dryness Trituration with diethyl ether (20 mL) gave solid material which was further washed with diethyl ether (20 ml) The liquors were concentrated triturated with diethyl ether (10 mL) the solid being collected

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Sodium hydride (60%, 26 mg, 0.66 mmole) was added to a solution of 101 mg. (0.33 mol) of 17-keto-4-methyl-5α-androstan-3-one (F) and 173 mg (0.66 mol) of diethyl 2-chlorobenzylphosphonate in 1.0 ml of dry DMF at room temperature. The mixture was heated at 70° C. in a nitrogen atmosphere with stirring for 110 minutes, cooled, poured into 0.5N HCl (20 ml) and extracted with methylene chloride (3×). The organic phases were combined, washed with water (3×), saturated NaCl solution and dried over magnesium sulfate. The organic phase was concentrated under reduced pressure to yield a tan, gummy solid. Flash chromatography of the crude solid was conducted on a silica gel 60×20 mm column, and eluted with 4:1 methylene chloride/acetone in 6 ml. fractions. Fractions 18-24 contained the product which were combined and evaporated to yield a white solid, mp 205°-208° C., yielding one spot on silica gel TLC using 4:1 methylene chloride/acetone. The proton NMR confirmed the assigned structure for 39. at room temperature cooled extracted with methylene chloride (3×) washed with water (3×), saturated NaCl solution dried over magnesium sulfate The organic phase was concentrated under reduced pressure to yield a tan, gummy solid eluted with 4:1 methylene chloride/acetone in 6 ml evaporated to yield a white solid, mp 205°-208° C. yielding one spot on silica gel TLC

Conditions: temp:3.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: At 3° C., a solution of diethyl 2-chlorobenzylphosphonate (2.00 g, 7.61 mmol) in dry DMF (30 ml) was added to a stirred suspension of sodium hydride (60% by weight suspension in mineral oil, 365 mg, 9.13 mmol; freshly washed with dry heptane) in dry DMF (20 ml). After 1 h of stirring at 3° C., a solution of 2′,4′-difluoroacetophenone (1.31 g, 8.37 mmol) in dry DMF (20 ml) was added dropwise. The resulting mixture was stirred at RT for 68 h and then diluted with water and extracted with diethyl ether. The organic phase was dried and concentrated to dryness under reduced pressure, and the residue was purified by chromatography on silica gel, which gave 1-[1-(2-chlorophenyl)prop-1-en-2-yl]-2,4-difluorobenzene as a 93/7 mixture of diastereoisomers [colourless solid, 560 mg, yield 26%; GC/MS: m/z=264 (M+); HPLC/MS: log P(HCOOH)=5.05 (major diastereoisomer), 5.34 (minor diastereoisomer)]. freshly washed with dry heptane) in dry DMF (20 ml) The resulting mixture was stirred at RT for 68 h extracted with diethyl ether The organic phase was dried concentrated to dryness under reduced pressure the residue was purified by chromatography on silica gel, which

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

Procedure: To a solution of diethyl 2-chlorobenzylphosphonate (4.91 g, 0.018 mol) and 7-bromo-5-methoxybenzofuran-2-carbaldehyde (11.27 g, 0.016 mol) in tetrahydrofuran (80 mL) was added sodium hydride (60% dispersion in mineral oil, 0.74 g, 0.0185 mol). After 5 min. the reaction mixture was warmed to 60° C. for 1 h. The reaction mixture was cooled to room temperature, water (10 mL) was carefully added and the tetrahydrofuran was removed. Water (50 mL) was added and the mixture was extracted with ethyl acetate (3×100 mL). The combined ethyl acetate extracts were washed with brine (50 mL), dried over magnesium sulphate, filtered and concentrated to dryness. Trituration with diethyl ether (20 mL) gave solid material which was further washed with diethyl ether (20 ml). The liquors were concentrated and triturated with diethyl ether (10 mL), the solid being collected. The combined solids gave (859) (4.89 g, 84%). 1H NMR δ (CDCl3) 7.70 (d, J=16 Hz, 1H), 7.65 (dd, J=7.7, 1.5 Hz, 1H), 7.4 (dd, J=6.0, 1 Hz, 1H), 7.23 (m, 2H), 7.05 (d, J=2.3 Hz, 1H), 6.94 (d, J=16 Hz, 1H), 6.92 (d, J=2.3 Hz, 1H), 6.72 (s, 1H), 3.82 (s, 3H); MH+:364.9, 362.9 MH−:362.9, 360.9. The reaction mixture was cooled to room temperature the tetrahydrofuran was removed Water (50 mL) was added the mixture was extracted with ethyl acetate (3×100 mL) The combined ethyl acetate extracts were washed with brine (50 mL) dried over magnesium sulphate filtered concentrated to dryness Trituration with diethyl ether (20 mL) gave solid material which was further washed with diethyl ether (20 ml) The liquors were concentrated triturated with diethyl ether (10 mL) the solid being collected