Highly β‐Selective Epoxidation of Δ
5
‐Unsaturated Steroids Catalyzed by Ketones
摘要:
A general catalytic and environmentally friendly method for beta-epoxidation of Delta(5)-unsaturated steroids has been developed, which uses ketones as the catalysts and Oxone as the terminal oxidant. A whole range of Delta(5)-unsaturated steroids, which bear different functional groups such as hydroxyl, carbonyl, acetyl, or ketal, as well as different side chains, were conveniently converted to the corresponding synthetically and biologically interesting 5 beta,5 beta-epoxides with excellent beta-selectivities and high yields.
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.
Steroids 36: Synthesis of 16,16-dimethyl-17-ketosteroids and 16,16-dimethyl-17β-hydroxysteroids
作者:Janos Wolfling、Gyula Schneider、Gyorgy Dombi
DOI:10.1016/0039-128x(88)90022-0
日期:1988.3
Direct conversion of 17-ketosteroids (Ia-f) into 16,16-dimethyl-17 beta-hydroxysteroids (IIa-f) and 16,16-dimethyl-17-ketosteroids (IIIa-f) was achieved with methyl iodide in the presence of NaH.
US6841665B2
申请人:——
公开号:US6841665B2
公开(公告)日:2005-01-11
[EN] METHOD FOR SYNTHESIZING 5ß, 6ß-EPOXIDES OF STEROIDS BY A HIGHLY ß-SELECTIVE EPOXIDATION OF DELTA5-UNSATURATED STEROIDS CATALYZED BY KETONES<br/>[FR] PROCEDE DE SYNTHESE DE 5 DOLLAR G(B),6 DOLLAR G(B)-EPOXYDES DE STEROIDES PAR EPOXYDATION HAUTEMENT DOLLAR G(B)-SELECTIVE DE STEROIDES DOLLAR G(D)5-INSATURES CATALYSES PAR DES CETONES
申请人:UNIV HONG KONG
公开号:WO2003074545A1
公开(公告)日:2003-09-12
A general, efficient, and environmentally friendly method is provided for producing mostly ß-epoxides of Δ5-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 5ß, 6ß-epoxides of steroids from Δ5-unsaturated steroids having a substituent at the 3α-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 Δ5-unsaturated steroids, bearing different functional groups such as hydroxy, carbonyl, acetyl of ketal group as well as different side chains, were conveniently converted to the corresponding synthetically and biologically interesting 5ß, 6ß-epoxides with excellent ß-selectivities and high yields.
Highly β‐Selective Epoxidation of Δ
<sup>5</sup>
‐Unsaturated Steroids Catalyzed by Ketones
A general catalytic and environmentally friendly method for beta-epoxidation of Delta(5)-unsaturated steroids has been developed, which uses ketones as the catalysts and Oxone as the terminal oxidant. A whole range of Delta(5)-unsaturated steroids, which bear different functional groups such as hydroxyl, carbonyl, acetyl, or ketal, as well as different side chains, were conveniently converted to the corresponding synthetically and biologically interesting 5 beta,5 beta-epoxides with excellent beta-selectivities and high yields.