发明授权
US5434258A .delta..sup.1,4 -pregnadiene-3,20-diones 失效
δ1,4-孕二烯-3,20-二酮

.delta..sup.1,4 -pregnadiene-3,20-diones
摘要:
A compound of the formula ##STR1## wherein R is selected from the group consisting of hydrogen, acyl of an organic carboxylic acid of 1 to 8 carbon atoms, allyloxycarbonyl, alkoxycarbonyl and aralkoxycarbonyl of up to 8 carbon atoms and alkylsulfonyl and arylsulfonyl of up to 8 carbon atoms and their use to prepare substituted 16,17-methylenedioxy-steroids and novel intermediates.
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