19-Norsteroids of Unnatural Configuration from Ergosterol
作者:Ahmed H. Eimasry、Ole Gisvold
DOI:10.1002/jps.2600590403
日期:1970.4
of unnatural configuration from ergosterol has been described. This method led to the preparation of 5α,8α,9α,10α-19-norpregnan-3,20-dione which possesses unnatural configuration at positions 8 and 10. The following reaction sequence was utilized to prepare this steroid. Ergosterol was photo-oxidized to give bisergostatrienol that was pyrolyzed to yield neoergosterol whose sidechain was cleaved by