of lithocholic acid (3α-hydroxy-5β-cholan-24-oic acid) to 1β,3α-dihydroxy-5β-cholan-24-oic acid. The key reactions used are regioselective functionalization at C-2 in the 5β-steroid nucleus, stereoselective epoxidation of intermediary α,β-conjugated ketone with dimethyldioxirane, and subsequent reductive cleavage of the resulting β-epoxy-ketone with PhSeNa.