Synthesis of dihydropyrroles by the intramolecular addition of alkylideneaminyl radicals generated from O-2,4-dinitrophenyloximes of γ,δ-unsaturated ketones
作者:Katsuya Uchiyama、Yujiro Hayashi、Koichi Narasaka
DOI:10.1016/s0040-4020(99)00453-6
日期:1999.7
Alkylideneaminyl radicals are generated from O-2,4-dinitrophenyloximes of γ,δ-unsaturated ketones by treatment with NaH and 3,4-methylenedioxyphenol. The resulting radical species successively add to the olefinic moiety intramolecularly to afford dihydropyrroles in the presence of a radical trapping agent. This method is applied for the stereoselective synthesis of xenovenine, a bicyclic 3,5-dialkylpyrrolizidine
通过用NaH和3,4-亚甲基二氧苯酚处理,由γ,δ-不饱和酮的O -2,4-二硝基苯肟生成烷基亚胺基。在自由基捕获剂的存在下,所得的自由基物质相继地分子内添加至烯烃部分,以提供二氢吡咯。该方法适用于异戊烯维酮(一种双环3,5-二烷基吡咯烷嗪生物碱)的立体选择性合成。