Аннотация:
The 20,20-dimethylacetal group proposed for protection of 20-oxo group in 21-hydroxylation of steroids by hypervalent iodine compounds has been successfully used to hamper side reactions in microbial 9α- and 11β-hydroxylation and 4-dehydrogenation of 21-hydroxy-16α,17α-epoxypregnanes by Rhodococcus sp., Curvularia Iunata and Corynebacterium mediolanum cultures.