反应详情

温度

80 °C

Diethyl(3-pyridyl)borane (3.38 g, 23 mmol) from Aldrich Chemical Co. Ltd. was added to a stirred solution of 3β-acetoxyandrosta-5,16-dien-17-yl trifluoromethanesulphonate (6.94 g, 15 mmol) in THF (75 ml) containing bis(triphenylphosphine)palladium(II) chloride (0.105 g, 0.15 mmol). An aqueous solution of sodium carbonate (2M, 30 ml) was then added and the mixture heated, with stirring, by an oil bath at 80° C. for 1 h, and allowed to cool. The mixture was partitioned between diethyl ether and water, the ether phase was dried (Na2CO3), filtered through a short plug of silica, and concentrated. Chromatography, on elution with light petroleum-diethyl ether (2:1), afforded the title compound (4.95 g, 84%) which crystallised from hexane, m.p. 144°-145° C., 1H-NMR(CDCl3) inter alia δ1.05(3H,s, 19-CH3), 1.08(3H,s,18-CH3), 2.04(3H,s,CH3CO2), 4.60(1H,m,3α-H), 5.42(1H,dm, J 4.7 Hz,6-H), 5.99(1H,m,16-H), 7.23(1H,m,Py 5-H) 7.65(1H,m,Py 4-H), 8.46(1H,m,Py 6-H), 8.62(1H,m,Py 2-H). Anal. Calcd: C, 79.75; H, 8.50; N, 3.58. Found: C, 79.78; H, 8.52; N, 3.54%.

1. temperaturethe mixture heated
2. temperatureto cool
3. customThe mixture was partitioned between diethyl ether and water
4. dry with materialthe ether phase was dried (Na2CO3)
5. filtrationfiltered through a short plug of silica
6. concentrationconcentrated
7. washChromatography, on elution with light petroleum-diethyl ether (2:1)