A New Approach to Dihydrobenzofurans and Dihydrobenzopyrans (Chromans) Based on the Intramolecular Trapping by Alcohols of Benzynes Generated from 7-Substituted-1-aminobenzotriazoles
作者:Michael A Birkett、David W Knight、Paul B Little、Michael B Mitchell
DOI:10.1016/s0040-4020(00)00021-1
日期:2000.2
1-Aminobenzotriazoles 9 having 7-hydroxyalkyl substituents are efficiently converted into the corresponding benzynes 4 when treated with N-iodosuccinimide which then undergo highly efficient intramolecular trapping by the pendant hydroxyl groups leading to dihydrobenzofurans 24–26 and dihydrobenzopyrans (chromans) 27, with incorporation of a synthetically useful iodine atom adjacent to the new ether bond, which allows
1-Aminobenzotriazoles 9具有7-羟烷基取代基被有效地转化成相应的benzynes 4当用处理过的Ñ碘代丁二酰亚胺,其然后由羟基侧基导致二氢苯并呋喃经历高效分子内俘获24 - 26和dihydrobenzopyrans(苯并二氢吡喃)27,与掺入与新的醚键相邻的合成有用的碘原子的混合物,它可以使用Stille,Sonogashira和Heck偶联进行后续且高产的同系物。