Asymmetric Michael addition of 4H-thiopyran-4-one to nitroolefins catalyzed by diamine mono-N-sulfonamide and its application to concise synthesis of enantiopure multiring heterocycles
作者:Lei Mo、Huang Tang、Zhu-Jun Yao
DOI:10.1016/j.tet.2013.05.116
日期:2013.8
and diastereoselective Michael addition of 4H-thiopyran-4-one to a variety of nitroolefins. Catalyst 10 was identified in the examinations to exhibit more superior catalytic ability than the traditional chiral pyrrolidine catalysts, giving high chemical yields, excellent diastereo- and enantioselectivities (up to 99:1 dr and 98% ee). The tert-butyl sulfonamide functionality of catalyst 10 is speculated
已经设计,合成了一系列新的C 2对称的2'-联吡咯烷单-N-磺酰胺,并将其成功地用作有机催化剂,用于将4 H -thiopyran-4-one对映体和非对映体选择性迈克尔加成。硝基烯烃。在检查中鉴定出的催化剂10具有比传统的手性吡咯烷催化剂更高的催化能力,具有较高的化学收率,出色的非对映体和对映体选择性(高达99:1 dr和98%ee)。催化剂10的叔丁基磺酰胺官能度推测在过渡态中作为庞大的基团和氢键受体都起着至关重要的作用。还研究了代表性的迈克尔加合物的应用,并证明其对于通过独特的常见双环硝酮中间体的对映纯多环杂环的面向多样性的合成是有用的。