Stereoselective Synthesis of [1]Benzopyrano[4,3-<i>b</i>]pyrrol-4(3<i>H</i>)-ones through Cycloadditions of Azomethine Ylides with α,β-Unsaturated Esters
作者:Kazunori Ueno、Shuji Kanemasa、Otohiko Tsuge
DOI:10.1246/bcsj.62.808
日期:1989.3
Cycloadditions of azomethine ylides generated from α-benzylideneamino nitriles bearing a hydroxyl or its O-protected moiety with α,β-unsaturated esters such as dimethyl maleate, fumarate, methyl acrylate, crotonate, methacrylate, and cinnamate lead stereoselectively to 3,3a-trans-3a,9b-cis-3a,9b-dihydro[1]benzopyrano[4,3-b]pyrrole-4(3H)-ones after subsequent lactonization.
由带有羟基或其 O-保护部分的 α-亚苄基氨基腈与 α,β-不饱和酯(如马来酸二甲酯、富马酸、丙烯酸甲酯、巴豆酸、甲基丙烯酸酯和肉桂酸酯)生成的偶氮甲碱叶立德的环加成立体选择性地导致 3,3a-反式-3a,9b-cis-3a,9b-dihydro[1]benzopyrano[4,3-b]pyrrole-4(3H)-ones 在随后的内酯化后。