The present invention discloses a process for the preparation of 16, 17-acetals of pregnane derivatives having formula I
wherein each substituent is independently selected from;
R1 is H or CH3;
R2 is C1-C6 linear or branched alkyl, alkynyl group or cycloalkyl group; aryl or heteroaryl group; or
R1 and R2 combine to form saturated, unsaturated C3-C6 cyclic or heterocyclic ring;
R3 and R4 are same or different and each independently represents H or halogen;
R5 is —OH or —OCOR wherein R represents H or C1-C6 linear, branched or cyclic alkyl group that may be substituted.
本发明公开了一种具有式 I 的孕烷衍
生物的 16、17-
乙缩醛的制备方法
其中每个取代基独立地选自以下各项
R1 是 H 或
CH3
R2 是 C1-C6 直链或支链烷基、炔基或环烷基;芳基或杂芳基;或
R1 和 R2 结合形成饱和、不饱和的 C3-C6 环或杂环;
R3 和 R4 相同或不同,各自独立地代表 H 或卤素;
R5 是-OH 或-OCOR,其中 R 代表 H 或可被取代的 C1-C6 直链、支链或环状烷基。