HCID 66910183, compound → HCID 66910132, compound

Participants

Reaction Steps

To a solution of 3β,17β-di(dimethyltert-butylsilyloxy)androstane-6α-ol and 3α,17β-di(dimethyltert-butylsilyloxy)androstane-6α-ol (90/10 mixture, 6.30 g) in CH2Cl2 (60 mL) under N2, NMNO (4.07 g), TPAP (0.412 g) and 4 Å molecular sieves (3.50 g) were added. The mixture was stirred for 2 h and then SiO2 was added. The mixture was purified by flash chromatography (SiO2, n-hexane/Et2O 50/50) to give 3β,17β-di(dimethyltert-butylsilyloxy)-androstane-6-one and 3α,17β-di(dimethyltert-butylsilyloxy)androstane-6-one (90/10 mixture, 6.30 g, 100%). 1H-NMR (300 MHz, DMSO-d6, ppm from TMS): δ 3.68 (m, 1H), 3.67-3.57 (m, 1H), 2.38-2.30 (m, 1H), 2.20-2.12 (m, 1H), 1.99-1.05 (m, 18H), 0.90 (s, 9H), 0.88 (s, 9H), 0.75 (s, 3H), 0.74 (s, 3H), 0.07-0.03 (s, 12H).

Provenance & Evidence