PREPARATION PROCESS OF NEW STEROID DERIVATIVES

摘要

Steroid derivs. of formula(I) are new. Reacting (II) with hydrating agent capable of free ketone to give (I'A), with ketaling agent to (I'B), with acid to (I). In the formula, R'= C1-18 org. gp. contg. at least 1 N, P or Si atom at near 11carbon; R2=C1-8 hydrocarbon; X may be substituted; A is freely to ketal, CH(OH), C=NOH, C=NOalK3(alk3=C1-8 alkyl or C7-15 aralkyl); B and C are interbonded by double or epoxide; K=ketal, thioketal, oxime or methyloxime.