Intramolecular nucleophilic carbonyl trapping of α-ketenyl radicals by an amino group
作者:Mami Tojino、Yoshitaka Uenoyama、Takahide Fukuyama、Ilhyong Ryu
DOI:10.1039/b408746a
日期:——
Free-radical carbonylation of omega-alkynylamines with tributyltin hydride gives a mixture of alpha-methylene lactams and alpha-stannylmethylene lactams. Nucleophilic addition of an internal amino group to the carbonyl group of alpha-ketenyl radicals is proposed as the cyclization step. The subsequent unusual 1,4-H shift from the resulting 1-hydroxyallyl radical, followed by elimination of the beta-tributyltin
用氢化三丁基锡将ω-炔胺进行自由基羰基化反应,得到α-亚甲基内酰胺和α-锡烷基亚甲基内酰胺的混合物。建议将内部氨基亲核加成到α-烯基自由基的羰基上作为环化步骤。随后的异常1,4-H从生成的1-羟基烯丙基自由基转移,然后消除β-三丁基锡自由基导致形成α-亚甲基内酰胺。