Novel Stereoselective Synthesis of 7β-Methyl-Substituted 5-Androstene Derivatives
作者:Yunhong Zheng、Yuanchao Li
DOI:10.1021/jo020290x
日期:2003.2.1
The 7beta-methyl-5-androstene derivatives 11a-c were prepared in good yield with high stereoselectivities starting from 3beta-acetoxyandrost-5-en-17-one 4. The addition of methylmagnesiumiodide to the 7-carbonyl group of 7a-c gave, after hydrolysis, two isomers 9a-c and 10a-c, which were stereoselectively deoxygenated by means of an ionic hydrogenation to afford the compounds 11a-c.