Chemoselective reduction of a lactam carbonyl group in the presence of a gem-dicarboxylate by sodium borohydride and iodine: a facile entry to N-aryl trisubstituted pyrroles
作者:Pranab Haldar、Jayanta K Ray
DOI:10.1016/j.tetlet.2003.09.085
日期:2003.11
Several N-aryl γ-lactam gem dicarboxylates were chemoselectively reduced to cyclic amine diesters by using sodium borohydride–iodine system. The reduction in all cases was completed within 2.5 h after refluxing in THF. The cyclic amine products were isolated after aqueous (acidic) workup in good yields. Hydrolytic decarboxylation followed by dehydrogenation produced N-aryl carboethoxy pyrroles.
使用硼氢化钠-碘体系将几种N-芳基γ-内酰胺宝石二羧酸盐化学选择性还原为环状胺二酯。在所有情况下,在THF中回流后2.5小时内完成还原。在水性(酸性)后处理中分离出环状胺产物,收率很高。水解脱羧,然后脱氢产生N-芳基碳乙氧基吡咯。