Method for synthesizing 5beta, 6beta-epoxides of steroids by a highly beta-selective epoxidation of delta5-unsaturated steroids catalyzed by ketones
申请人:——
公开号:US20030018188A1
公开(公告)日:2003-01-23
A general, efficient, and environmentally friendly method is provided for producing mostly &bgr;-epoxides of &Dgr;
5
-unsaturated steroids using certain ketones as the catalyst along with an oxidizing agent, or by using certain dioxiranes. In another aspect of the invention, a method is provided for producing mostly 5&bgr;,6&bgr;-epoxides of steroids from &Dgr;
5
-unsaturated steroids having a substituent at the 3&agr;-position by an epoxidation reaction using a ketone along with an oxidizing agent under conditions effective to generate epoxides, or using a dioxirane under conditions effective to generate epoxides. A whole range of &Dgr;
5
-unsaturated steroids, bearing different functional groups such as hydroxy, carbonyl, acetyl or ketal group as well as different side chains, were conveniently converted to the corresponding synthetically and biologically interesting 5&bgr;,6&bgr;-epoxides with excellent &bgr;-selectivities and high yields.
提供了一种通用、高效且环保的方法,用于利用某些酮作为催化剂以及氧化剂,或者使用某些二氧杂环丙烷,生产大部分为&Dgr; 5 -不饱和类固醇的&bgr;-环氧化物。在发明的另一个方面,提供了一种方法,通过使用酮以及氧化剂进行环氧化反应,或者在有效条件下使用二氧杂环丙烷,从3&agr;-位有取代基的&Dgr; 5 -不饱和类固醇中生产大部分为5&bgr;,6&bgr;-环氧化物。一整套带有不同官能团(如羟基、酮基、乙酰基或缩醛基)以及不同侧链的&Dgr; 5 -不饱和类固醇,方便地转化为相应的合成和生物学上有趣的5&bgr;,6&bgr;-环氧化物,具有优异的&bgr;-选择性和高产率。