Sodium Carbonate → 3-[2,3,5,6-Tetrafluoro-4-(trifluoromethyl)phenoxy]-17-(3-pyridinyl)androsta-3,5,16-triene

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The method essentially followed that of Example 1(b) but using diethyl(3-pyridyl)borane (0.44 g, 3.0 mmol), 3-[2,3,5,6-tetrafluoro-4-(trifluoromethyl)phenoxy]androsta-3,5,16-trien-17-yl trifluoromethanesulphonate (1.27 g, 2.0 mmol), THF (10 ml), bis(triphenylphosphine)palladium(II) chloride (70 mg, 0.1 mmol), and aqueous sodium carbonate (2M, 5 ml). Chromatography, on elution with light petroleum-diethylether (3:1), afforded the title compound (0.82g, 73%) which crystallised from hexane, m.p. 166.0°-166.5° C. 1H-NMR (CDCl3) inter alia δ 1.05(3H,s,19-CH3), 1.07(3H,s,18-CH3), 5.18(1H,s,4-H), 5.32(1H,m,6-H), 6.01(1H,m, 16-H), 7.23(1H,m,Py 5-H), 7.66(1H,m,Py 4-H, 8.47(1H,m,Py 6-H), 8.63(1H,m,Py 2-H). Anal. Calcd: C, 66.07; H, 5.01; N, 2.49; F, 23.60. Found: C, 65.97; H, 5.02; N, 2.47; F, 23.41%.

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