Diastereoselective Synthesis of 4,5‘-Bis-proline Compounds via Reductive Dimerization of <i>N</i>-Acyloxyiminium Ions
作者:Franca Zanardi、Andrea Sartori、Claudio Curti、Lucia Battistini、Gloria Rassu、Giuseppe Nicastro、Giovanni Casiraghi
DOI:10.1021/jo062406l
日期:2007.3.1
A short, practical synthesis of novel, unsymmetrical 4,5‘-bis-proline compounds has been achieved, highlighted by the application of an unprecedented samarium diiodide-driven regio- and diastereocontrolled reductive dimerization of N-acyloxyiminium ions generated from readily available 2-methoxy-5-silyloxymethyl-N-Boc pyrrolidines. The title proline dimers proved to be pertinent metal-free catalysts
已实现了新颖,不对称的4,5'-双脯氨酸化合物的简短,实用合成,这一点的突出之处在于应用了前所未有的sa二碘化物驱动的由N-酰氧基亚胺离子生成的N-酰氧基亚胺离子的区域和非对映体控制的还原二聚化反应。甲氧基-5-甲硅烷氧基甲基-N - Boc吡咯烷。标题脯氨酸二聚体被证明是在醇醛和曼尼希反应中相关的无金属催化剂。