Catalytic, Enantioselective, and Highly Chemoselective Bromocyclization of Olefinic Dicarbonyl Compounds
作者:Yi Zhao、Xiaojian Jiang、Ying-Yeung Yeung
DOI:10.1002/anie.201304107
日期:2013.8.12
Overriding preferences: An amine–thiocarbamate catalyst can mediate the facile, efficient, and highly enantioselective bromocyclization of olefinic 1,3‐dicarbonyl compounds. In the presence of the bifunctional catalyst, the bromination occurs chemoselectively at the olefinic moiety rather than at the carbon atom in the α‐position to the carbonyl units.
优先选择:胺-硫代氨基甲酸酯催化剂可介导烯烃1,3-二羰基化合物的简便,高效和高度对映选择性溴环化。在双功能催化剂的存在下,溴化反应是化学选择性地发生在烯烃部分,而不是发生在羰基单元α位的碳原子上。