The<i>homo</i>-PADAM Protocol: Stereoselective and Operationally Simple Synthesis of α-Oxo- or α-Hydroxy-γ-acylaminoamides and Chromanes
作者:Fabio Morana、Andrea Basso、Renata Riva、Valeria Rocca、Luca Banfi
DOI:10.1002/chem.201300023
日期:2013.4.2
A straightforward and fully stereoselective synthesis of a new class of peptidomimetics, that is α‐oxo‐γ‐acylaminoamides, was achieved starting from various benzaldehydes by a sequence of 1) an asymmetric organocatalytic Mannich reaction, 2) a Passerini multicomponent reaction, 3) an amine deprotection–acyl migration protocol, and 4) a final oxidation. The whole sequence can be performed without purification
从各种苯甲醛开始,通过一系列顺序1,不对称的有机催化曼尼希反应,2,Passerini多组分反应,3),可以直接和完全立体选择性地合成新型肽模拟物α-氧代-γ-酰基氨基酰胺。胺脱保护-酰基迁移方案,以及4)最终氧化。整个序列可以在不纯化中间体的情况下进行,并且代表了同源物的第一个例子。-Passerini-胺脱保护-酰基迁移(PADAM)策略。α-氧代-γ-酰基氨基酰胺的高度立体选择性还原也提供了α-羟基-γ-酰基氨基酰胺。在某些情况下,两种非对映异构体都是通过简单地还原还原剂而获得的。最后,从受保护的水杨醛开始,相同的序列,接着进行Mitsunobu环化,得到高度取代的苯并二氢吡喃。