Nucleophilic Addition of Enols and Enamines to α,β-Unsaturated Acyl Azoliums: Mechanistic Studies
作者:Ramesh C. Samanta、Biplab Maji、Suman De Sarkar、Klaus Bergander、Roland Fröhlich、Christian Mück-Lichtenfeld、Herbert Mayr、Armido Studer
DOI:10.1002/anie.201109042
日期:2012.5.21
(deprotonated β‐diketones, enamines, and malonodinitrile) was investigated by NMR and kinetic experiments. These investigations proved that CC bond formation occurs by a Michael‐type 1,4‐addition and not by a 1,2‐addition and subsequent [3,3]‐sigmatropic rearrangement. The first X‐ray structure of an α,β‐unsaturated acyl azolium salt (1) is also presented.
1,4,而不是1,2!的反应性1朝向不同的亲核试剂(去质子化的β二酮类,烯胺,并malonodinitrile)通过NMR和动力学实验研究。这些研究证明是c 由Michael型1,4-加成而不是由1,2-加成和随后的[3,3] -sigmatropic重排发生C键的形成。还介绍了α,β-不饱和酰基偶氮盐(1)的第一个X射线结构。