Site-Selective Carbonylative Synthesis of Structurally Diverse Lactams from Heterocyclic Amines with TFBen as the CO Source
作者:Jun Ying、Qian Gao、Xiao-Feng Wu
DOI:10.1021/acs.joc.9b02114
日期:2019.11.1
A palladium-catalyzed site-selectiveC-Hcarbonylation of heterocyclic amines for the synthesis of lactam motifs has been developed. The reaction of 3-thiophene methylamines, 2-thiophene methylamines, and tryptamines with benzene-1,3,5-triyl triformate (TFBen) as the CO source provides a series of structurally diverse lactams in moderate to high yields with excellent regioselectivities.
Amines are prominent in natural products, pharmaceutical agents and agrochemicals. Moreover, they are synthetically valuable building blocks for the construction of complex organic molecules and functional materials. However, amines, especially aliphatic and aromaticamines with free N–H bonds, tend to coordinate with transition metals and deactivate the catalyst, posing a tremendous challenge to applying