Synthesis of 16.ALPHA.-hydroxyandrost-4-ene-3,17,19-trione and 3.BETA.,16.ALPHA.-dihydroxyandrost-5-ene-17,19-dione: Potential intermediates of estriol biosynthesis.
the desired steroid 10. 3 beta,16 alpha-Dihydroxyandrost-5-ene-17,19-dione (14) was also synthesized from 5 alpha-bromo-3 beta,16 alpha-diacetoxy-6 beta, 19-epoxyandrostan-17-one (11) through the intermediates 12 and 13 with the 3 beta- and 16 alpha-hydroxy functions protected as their acetates in a reaction sequence similar to that above.