Synthesis of N-substituted pyrrole and tetrahydroindole derivatives from alkenyl β-dicarbonyl compounds
作者:Helena M.C Ferraz、Fernando L.C Pereira、Fátima S Leite、Marta R.S Nunes、M.Elena Payret-Arrúa
DOI:10.1016/s0040-4020(99)00625-0
日期:1999.9
to the formation of the corresponding pyrrole or tetrahydroindole derivatives. In the absence of base, the iodo-β-enamino esters 5 and 7 underwent spontaneous aromatization after dehydroiodination, furnishing the 4, 5, 6, 7-N-substituted-tetrahydroindoles 19 and 20. All the elimination reactions proceeded smoothly, in yields ranging from 71% to 99%. Starting from the β-allyl-dimedone 21, it was possible
一系列烯基取代的β-烯氨基酯和酮的碘环化,然后碱促进的脱氢碘化作用,导致形成相应的吡咯或四氢吲哚衍生物。在不存在碱的情况下,碘代-β-烯氨基酯5和7在脱氢碘化后进行自发芳构化,得到4、5、6、7 -N-取代的四氢吲哚19和20。所有消除反应均进行顺利,产率为71%至99%。从β-烯丙基二甲酮21开始,可以以中等的总产率制备氧代四氢吲哚24。