Tetraarylphosphonium Salt-Catalyzed Synthesis of Oxazolidinones from Isocyanates and Epoxides
作者:Yasunori Toda、Shuto Gomyou、Shoya Tanaka、Yutaka Komiyama、Ayaka Kikuchi、Hiroyuki Suga
DOI:10.1021/acs.orglett.7b02722
日期:2017.11.3
Preparation of a range of oxazolidinones, including enantioenriched N-aryl-substituted oxazolidinones, in which tetraarylphosphonium salts (TAPS) catalyze the [3 + 2] coupling reaction of isocyanates and epoxides effectively, is described. The key finding is a Brønsted acid/halide ion bifunctional catalyst that can accelerate epoxide ring opening with high regioselectivity. Mechanistic studies disclosed
描述了一系列恶唑烷酮的制备,包括对映体富集的N-芳基取代的恶唑烷酮,其中四芳基salts盐(TAPS)有效催化异氰酸酯和环氧化物的[3 + 2]偶联反应。关键发现是布朗斯台德酸/卤离子双功能催化剂,该催化剂可以以高区域选择性加速环氧化物的开环。机理研究表明,TAPS产生的叶立德以及卤代醇的形成在与异氰酸酯的反应中起着至关重要的作用。