Synthesis of heterocycles via ligand-free palladium catalyzed reductive Heck cyclization
作者:Pingli Liu、Liang Huang、Yuelie Lu、Mina Dilmeghani、Jean Baum、Tingjian Xiang、Jeff Adams、Andrew Tasker、Rob Larsen、Margaret M. Faul
DOI:10.1016/j.tetlet.2007.01.156
日期:2007.3
Synthesis of five and six membered heterocycles, indolines, 2,3-dihydrobenzofurans, chromans, isochromans, 1,2,3,4-tetrahydroquinolines, and 1,2,3,4-tetrahydroisoquinolines, in 70–99% yield by a ligand-free palladium catalyzed reductive Heck cyclization of phenyl bromides and chlorides, under mild conditions, is reported. Water was found to be essential for these reactions.
五个和六个成员的杂环,二氢吲哚,2,3-二氢苯并呋喃,苯并二氢吡喃,异苯并二氢吡喃,1,2,3,4-四氢喹啉和1,2,3,4-四氢异喹啉的合成,配体的收率为70-99%据报道,在温和的条件下,无钯钯催化的苯基溴化物和氯化物的还原性Heck环化反应。发现水对于这些反应是必不可少的。