Synthesis of Tetrasubstituted Pyrroles from Terminal Alkynes and Imines
摘要:
Tetrasubstituted pyrroles can be obtained via the reaction of terminal alkynes and Imines using (BuLi)-Bu-n as the base In one step with high chemoselectivity (method 1). Alternatively, the intermediate propargylamines can also react with imines to afford tetrasubstituted pyrroles when using LiHMDS as the base (method 2), which provides a complementary method to construct the pyrroles with different substituents.
Catalytic Deprotonative Functionalization of Propargyl Silyl Ethers with Imines
作者:Hiroshi Naka、Daiki Koseki、Yoshinori Kondo
DOI:10.1002/adsc.200800281
日期:2008.8.4
A metal-free, catalytic CH functionalization of propargylsilylethers with imines using the phosphazene base (t-Bu-P4 base) provides structurally defined multisubstituted pyrroles in modest to excellent yields under mild conditions. A one-pot, three-component reaction using silylated acetylenes, aldehydes, and imines is also presented.