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-epoxyketones with dimethylhydrazine results in cyclization to pyrrolidine-fused β-hydroxy dimethylhydrazones. Hydrolysis, mesylation, and elimination affords dihydropyrroles which can be converted to sulfonyl-protected ketopyrrolesvia oxidation with NIS; alternatively, treatment with DBU affords NH bearing ketopyrroles.