Methanesulfonic Acid Mediated Cyclization and Meyer-Schuster Rearrangement of γ-Amino-ynones: Access to Enantiopure Pyrrolidine Exocyclic Vinylogous Amides
作者:Huy-Dinh Vu、Jacques Renault、Thierry Roisnel、Nicolas Gouault、Philippe Uriac
DOI:10.1002/ejoc.201402336
日期:2014.7
protic acids or gold(I). Herein we disclose the unprecedented formation of pyrrolidine exocyclic vinylogous amides, in place of the expected azepinones or piperidinones, starting from γ-amino-ynones derived from amino acids. The process involves a tandem 1,2-addition of the protected nitrogen to the carbonyl group followed by a Meyer–Schuster rearrangement, which efficiently afforded enantiopure pyrrolidine
α-和β-氨基炔酮已被广泛用于在各种亲电子试剂如质子酸或金(I)存在下制备杂环。在本文中,我们公开了前所未有的吡咯烷外环乙烯基酰胺的形成,以代替预期的氮杂酮或哌啶酮,从氨基酸衍生的 γ-氨基炔酮开始。该过程包括将受保护的氮串联 1,2-加成到羰基,然后进行 Meyer-Schuster 重排,从而有效地提供对映体纯的吡咯烷外环乙烯基酰胺。该序列被金盐催化的效果很差,但在甲磺酸的存在下被证明是非常有效的。