Synthesis of N-Protected β-Aminocyclopropanedicarboxylates and Their Ring Transformation to <i>N</i>-Benzhydryl-3-alkoxycarbonyl-4,4-dialkylpyrrolidin-2-ones
作者:Norbert De Kimpe、Sven Mangelinckx
DOI:10.1055/s-2005-869850
日期:——
An easy and short synthesis of new N-protected β-aminocyclopropanedicarboxylates, a rather unexplored class of highly activated conformationally constrained β-amino acid derivatives, is described. Michael-induced ring closure (MIRC) of diphenylmethylidenamine to 2-bromoalkylidenemalonates leads to 3,3-dialkyl-2-(diphenylmethylidenamino)cyclopropane-1,1-dicarboxylates, the reactivity of which with hydrides was investigated, yielding 3-(alkoxycarbonyl)pyrrolidin-2-ones.
本文描述了一种简单且简短的新型N保护β-氨基环丙烷二羧酸酯的合成,这是一类尚未广泛探索的高度活化的构象受限β-氨基酸衍生物。通过迈克尔诱导环闭合(MIRC),二苯甲烯胺与2-溴烷基腈马来酸酯反应,形成了3,3-二烷基-2-(二苯甲烯胺基)环丙烷-1,1-二羧酸酯,其与氢化物的反应性被研究,生成了3-(烷氧羧基)吡咯烷-2-酮。