Thiazolium-Catalyzed Additions of Acylsilanes: A General Strategy for Acyl Anion Addition Reactions
作者:Anita E. Mattson、Ashwin R. Bharadwaj、Andrea M. Zuhl、Karl A. Scheidt
DOI:10.1021/jo060699c
日期:2006.7.1
utilizing N-heterocyclic carbenes (NHCs) derived from thiazolium salts has been developed for the generation of carbonyl anions from acylsilanes. Synthetically useful 1,4-diketones and N-phosphinoyl-α-aminoketones have been prepared in good to excellent yields via NHC-catalyzed additions of acylsilanes to the corresponding α,β-unsaturated systems and N-phosphinoylimines. These organocatalytic reactions
已经开发出一种利用衍生自噻唑鎓盐的N-杂环卡宾(NHC)的策略,用于从酰基硅烷生成羰基阴离子。合成有用的1,4-二酮和N-膦酰基-α-氨基酮是通过NHC催化将酰基硅烷添加到相应的α,β-不饱和体系和N中来制备的,具有良好至优异的收率-膦基嘧啶。这些有机催化反应是耐空气和耐水的方法,可进行稳健的羰基阴离子加成反应。另外,已经使用该羰基阴离子方法以一锅法有效地合成了多取代的芳族呋喃和吡咯。向反应中加入醇使该过程在噻唑鎓盐中具有催化作用。为了沿着提出的反应途径合成潜在的中间体,已经确定甲硅烷基化的噻唑鎓甲醇在适当的亲电试剂存在下经受标准反应条件时可以提供高收率的羰基阴离子加成产物。