The sequential addition/elimination/cycloammination of 4-pentynones in the presence of benzylamine or ammonia produces 1,2,3,-5-substituted and 2,3,5-substituted pyrroles and fused pyrrole systems, respectively in good to high yields. The methodology has been extended to the preparation of the 17β-hydroxyandrost-4-ene[3,2-b](1-benzyl-5-methyl)pyrrole.
在
苄胺或
氨存在下,4-戊炔酮依次加成/消除/环
氨基化,分别生成 1,2,3,-5 取代和 2,3,5 取代的
吡咯和融合的
吡咯系统,收率从好到高。该方法已扩展到 17δ²-羟基雄甾-4-烯[3,2-b](1-苄基-5-甲基)
吡咯的制备。