A mild, efficient and stereospecific intramolecular process for converting hydroxyphenols into benzodioxanes, dihydrobenzopyrans and dihydrobenzofurans via imidate esters is described. The only by-products are N,N-dimethylformamide and triethylamine hydrochloride which are removed by aqueous work-up making this process highly amenable to large scale operation.
描述了一种温和、高效且具有立体特异性的分子内反应过程,能够通过
咪唑酯将羟基
酚转化为苯并
二恶烷、二氢苯并
吡喃和二氢
苯并呋喃。唯一的副产物是
N,N-二甲基甲酰胺和
氯化
三乙胺,通过
水相处理去除,使得该过程非常适合大规模操作。