作者:Wei Zhang、Na Liu、Casi M. Schienebeck、Kyle Decloux、Suqing Zheng、Jenny B. Werness、Weiping Tang
DOI:10.1002/chem.201103809
日期:2012.6.4
developed for the enantioselective halolactonization of (Z)‐1,3‐enynes and 1,1‐disubstituted alkenes. In the case of 1,3‐enynes, the carboxylate nucleophile and halogen electrophile were added to the conjugated π‐system from the same face. Up to 99 % ee was achieved for the 1,4‐syn‐bromolactonization of conjugated (Z)‐1,3‐enynes. Based on the results from the enyne halolactonization, a second generation
已开发出新的有机催化剂,用于(Z)-1,3-烯和1,1-二取代烯烃的对映选择性卤代内酯化。在1,3-烯炔的情况下,将羧酸亲核试剂和卤素亲电子试剂从同一面添加到共轭π系统中。共轭(Z)-1,3-烯炔的1,4-顺-溴内酯化可实现高达99%的 ee。基于烯炔卤代内酯化的结果,设计了第二代用于简单烯烃的催化剂。ee高达91% 观察到1,1-二取代烯烃的氯内酯化。为烯炔和烯烃的对映选择性卤代内酯化而开发的催化剂由拴在脲基上的金鸡纳生物碱骨架组成。