Direct conversion of 13β-alkylgonatetraenes into 13β-alkylgon-4-en-3-ones
摘要:
Birch reduction of 8,9-didehydroestradiol-17 beta 3-methyl ether 1 or 9(11)-didehydroestradiol-17 beta 3-methyl ether 2 followed by acid hydrolysis results in a mixture of 19-nortestosterone 8 and 19-nor-9 beta, 10 alpha-testosterone 9 in varying amounts. However, reduction of their acetates with sodium or lithium, tert-butyl alcohol in liquid ammonia and in the presence of aniline affords exclusively 19-nortestosterone. Similarly, 18a-homo-19-nortestosterone 12 is prepared from the acetate of 18a-homoestradiol-17 beta 3-methyl ether, 10.
A Facile Conversion of Alcohols into <i>p</i>-Methoxybenzyl Ethers (PMB-ethers) Using <i>p</i>-Methoxybenzyl Alcohol−Yb(OTf)<sub>3</sub>
作者:Sharma、Mahalingam
DOI:10.1021/jo990563x
日期:1999.11.1
Direct conversion of 13β-alkylgonatetraenes into 13β-alkylgon-4-en-3-ones
作者:Panicker Bijoy、Uma Ramachandran、G. S. R. Subba Rao
DOI:10.1039/p19940002331
日期:——
Birch reduction of 8,9-didehydroestradiol-17 beta 3-methyl ether 1 or 9(11)-didehydroestradiol-17 beta 3-methyl ether 2 followed by acid hydrolysis results in a mixture of 19-nortestosterone 8 and 19-nor-9 beta, 10 alpha-testosterone 9 in varying amounts. However, reduction of their acetates with sodium or lithium, tert-butyl alcohol in liquid ammonia and in the presence of aniline affords exclusively 19-nortestosterone. Similarly, 18a-homo-19-nortestosterone 12 is prepared from the acetate of 18a-homoestradiol-17 beta 3-methyl ether, 10.