Y(OTf)3, were essential to promote the 1,4-addition of alkyl-substituted azaarenes to enones, and products were obtained in 60–96% yield. Lewis acid catalyzed benzylicC–H bond functionalization of alkyl-substituted azaarenes is described. The addition to N-tosyl imines proceeded under solvent-free conditions using various Lewis acids. Cu(OTf)2 was the best Lewis acid, and 1,2-addition proceeded at
A Lewis acid catalyzed benzylicC−H bond functionalization of alkyl-substituted azaarenes is described. Sc(OTf)3 and Y(OTf)3 promoted the direct addition of alkyl-substituted azaarenes and benzoxazole to enones and an α,β-unsaturated N-acylpyrrole. Products were obtained in 60−96% yield.
Functionalization of the Benzylic C-H Bonds in Azaarenes by Cobalt-Catalyzed 1,4-Addition to Enones
作者:Zaini Jamal、Yong-Chua Teo、Ling-Keong Wong
DOI:10.1002/ejoc.201403203
日期:2014.11
Functionalization of the C(sp3)–H bonds in azaarenes was catalyzed by CoCl2 as an inexpensive Lewis acid catalyst. Enones were demonstrated to be good C=C electrophilic acceptors for the construction of various azaarene-containing 1,4-addition products in yields of up to 95 %.