Conversion of δ-(sulfonyl)amino-α-epoxy ketones to bicyclic ketopyrroles via intramolecular conjugate-addition to azoene intermediates. Synthesis of the bicyclic ketopyrrole core of the 1-azafulvene roseophllin
作者:Seong Heon Kim、P.L Fuchs
DOI:10.1016/0040-4039(96)00390-5
日期:1996.4
Reaction of δ-(sulfonyl)amino-α-epoxy ketones with dimethylhydrazine results in cyclization to pyrrolidine-fused β-hydroxy dimethylhydrazones. Hydrolysis, mesylation, and elimination affords dihydropyrroles which can be converted to sulfonyl-protected ketopyrroles via oxidation with NIS; alternatively, treatment with DBU affords NH bearing ketopyrroles.
δ-(磺酰基)氨基-α-环氧酮与二甲基肼的反应导致环化成吡咯烷稠合的β-羟基二甲基hydr。水解,甲磺酰化和消除得到二氢吡咯,其可以通过用NIS氧化而转化为磺酰基保护的酮吡咯。另外,用DBU处理可得到带有NH的酮吡咯。