Tandem Ullmann–Goldberg Cross-Coupling/Cyclopalladation-Reductive Elimination Reactions and Related Sequences Leading to Polyfunctionalized Benzofurans, Indoles, and Phthalanes
作者:Faiyaz Khan、Mehvish Fatima、Moheb Shirzaei、Yen Vo、Madushani Amarasiri、Martin G. Banwell、Chenxi Ma、Jas S. Ward、Michael G. Gardiner
DOI:10.1021/acs.orglett.9b02235
日期:2019.8.16
Cu[I]- and Pd[0]-based catalysts, compounds such as 1 and 7 engage in tandem Ullmann–Goldberg cross-coupling and cyclopalladation-reductive elimination reactions to give benzofurans such as 8. Related reactions involving hetero-Michael additions of o-halogenated phenols or anilines to propiolates and the Pd[0]-catalyzed cyclization of the resulting conjugates provide, in a one-pot process, alternately
在暴露于基于Cu [I]和Pd [0]的催化剂组合时,化合物1和7会进行串联的Ullmann-Goldberg交叉偶联和环钯还原还原消除反应,得到苯并呋喃,例如8。涉及邻卤代酚或苯胺向丙酸酯的杂-迈克尔加成反应以及所得共轭物的Pd [0]催化环化的相关反应在一锅法中提供了交替官能化的苯并呋喃,吲哚或邻苯二甲酸。