Reaction Steps
Lithium aluminum hydride (58 mg; 0.31 mmol) was added to a solution of the 15β-ethyl-15α-methyl ketone (5) (100 mg; 0.31 mmol ) in dry tetrahydrofuran (2 ml) at 0° C. The solution was stirred at 0° C. for 5 min. Saturated aqueous ammonium chloride was added and the mixture was filtered. Standard work-up of the filtrate gave 15β-ethyl-3-methoxy-15α-methylestra-1,3,5(10)-trien-17β-ol (13) (92 mg; 90%), as an oil, [α]D +70° (c 1.0); υmax 3604 cm-1 (OH); δH 0.88 (3H, t, J 7.2 Hz, 15β-CH2CH3), 0.90 (3H, s, 15α-Me), 1.10 (3H, s, 13β-Me), 1.51 obsc (2H, m, 15α-CH2CH3), 1.73 obsc (2H, m, 16α- and 16β-H), 2.84 (2H, m, 6-H2), 3.74 (1H, dd, J 9.9 and 8.2 Hz, 17α-H), 3.78 (3H, s, 3-OMe), 6.63 (1H, d, J 2.8 Hz, 4-H), 6.71 (1H, dd, J 8.4 and 2.8 Hz, 2-H), and 7.21 (1H, d, J 8.4 Hz, 1-H); δC 8.6 (C-152), 13.9 (C-18), 25.9 (C-151), 28.6 (C-11), 29.0 (C-7), 29.9 (C-6), 30.3 (C-12), 36.8 (C-8), 39.0 (15α-Me), 40.0 (C-15), 45.2 (C-9), 45.5 (C-14), 55.2 (3-OMe), 59.6 (C-13), 79.5 (C-16), 80.0 (C-17), 111.4 (C-2), 113.6 (C-4), 126.2 (C-1), 133.0 (C-10), 137.7 (C-5), and 157.5 (C-3).
