作者:Marjan Jereb、Antonio Togni
DOI:10.1002/chem.200700920
日期:2007.11.16
The electrophilic enantioselective sulfenylation of 1,3-dicarbonyl compounds with phenylsulfenyl chloride is effectively catalyzed by [Ti(TADDOLato)] complexes. The corresponding products are obtained in moderate to high yields. The highest ee values (up to 97 %) are obtained in toluene at room temperature and with a typical catalyst loading of 5 mol %. Bulky ester groups and sterically undemanding
[Ti(TADDOLato)]配合物可有效催化1,3-二羰基化合物与苯基亚磺酰氯的亲电对映选择性亚磺酰基化。以中等至高收率获得相应的产物。在室温下,典型催化剂负载量为5 mol%时,在甲苯中获得最高ee值(最高97%)。为了确保高对映选择性,发现大的酯基和在α-位的空间上不需要的取代基是原料的关键结构特征。已经确定了一种手性产物的绝对构型。该反应的立体化学过程类似于类似的[Ti(TADDOLato)]催化的原子转移反应。