Cobalt(II)-Catalyzed Electrophilic Alkynylation of 1,3-Dicarbonyl Compounds To Form Polysubstituted Furans<i>via</i>π-π Activation
作者:Irwan Iskandar Roslan、Jiulong Sun、Gaik-Khuan Chuah、Stephan Jaenicke
DOI:10.1002/adsc.201400857
日期:2015.3.9
Polysubstituted furans were obtained with excellent yields via the electrophilic alkynylation of 1,3‐dicarbonyl compoundsws with phenyl‐ or ester‐substituted brominated alkynes. The reaction is catalyzed by the inexpensive and readily available catalyst, cobalt(II) chloride, and has a wide substrate scope. The C(sp)C(sp3) coupling occurs under mild conditions with short reaction times and does not
多取代呋喃是通过1,3-二羰基化合物ws与苯基或酯取代的溴代炔烃的亲电炔基化而获得的,具有优异的收率。该反应由廉价且容易获得的催化剂氯化钴(II)催化,并且具有广泛的底物范围。C(sp)C(sp 3)偶联在温和的条件下发生,反应时间短,不需要惰性气氛或配体。建议反应通过钴(II)与去质子化的1,3-二羰基化合物的螯合配合物进行。