Tail-to-tail dimerization and Rauhut-Currier reaction of disubstituted Michael acceptors catalyzed by N-heterocyclic carbene
作者:Shin-ichi Matsuoka、Naoki Awano、Masanori Nakazawa、Masato Suzuki
DOI:10.1016/j.tetlet.2016.11.031
日期:2016.12
The N-heterocyclic carbene (NHC)-catalyzed dimerizations of a variety of disubstituted Michael acceptors have been investigated. In addition to the tail-to-tail dimerization of methacrylates reported previously, the scope of vinylidene substrates expands to γ-methyl-α-methylene-γ-butyrolactone, dimethyl 2-methylenepentanedioate, dimethyl itaconate, methacrylamides, and 2-isopropenylbenzoxazole, none
已经研究了N-杂环卡宾(NHC)催化的各种双取代Michael受体的二聚反应。除了先前报道的甲基丙烯酸酯的尾到尾二聚以外,亚乙烯基底物的范围还扩大到了γ-甲基-α-亚甲基-γ-丁内酯,2-亚甲基戊二酸二甲酯,衣康酸二甲酯,甲基丙烯酰胺和2-异丙烯基苯并恶唑。其中的一些已被金属催化的对应物二聚化。相反,可能由于β-取代基的空间位阻,诸如丁烯腈,巴豆酸甲酯和2-环己烯-1-酮的亚乙烯基底物不经历二聚化。相反,发现这些的Rauhut-Currier(RC)反应正在进行。