Xs. Fei et al., SYNTHESIS OF 4-TRIFLUOROMETHYLSTEROIDS - A NOVEL CLASS OF STEROID 5-ALPHA-REDUCTASE INHIBITORS, Bioorganic & medicinal chemistry letters, 7(24), 1997, pp. 3113-3118
A concise synthetic approach to 4-trifluoromethyl steroids, a novel cl
ass of steroid 5 alpha-reductase inhibitors, is described. Direct trif
luoromethylation of steroid olefinic bromide with methyl fluorosulfony
l-difluoroacetate was used as a key step in the synthesis. The compoun
d 4 exhibited highly inhibitory activity than Finasteride in in vitro
assay. (C) 1997 Elsevier Science Ltd.