Radical dearomatising spirocyclisations onto the C-2 position of benzofuran and indole
作者:Afua S. Kyei、Kirill Tchabanenko、Jack E. Baldwin、Robert M. Adlington
DOI:10.1016/j.tetlet.2004.09.148
日期:2004.11
Spirolactams were obtained via an intramolecular radical ipso-type spirocyclisation in benzofuran and indole systems. Alkyl, vinyl and aryl radicals, tethered at the C-2 position of the heterocycle underwent radical cyclisation to produce novel tricyclic partially dearomatised heterocycles in moderate yields. Fragmentation of the furan ring was observed subsequent to spirocyclisation of a vinyl radical onto a
通过分子内自由基得到Spirolactams本位在苯并呋喃和吲哚系统型螺环。束缚在杂环的C-2位的烷基,乙烯基和芳基进行自由基环化,以中等收率生产新型三环部分脱芳烃化的杂环。在乙烯基自由基螺合到苯并呋喃上之后观察到呋喃环的断裂。