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.
Boehmite nanoparticles (AlOOH NPs) was found to be a highly active and green catalyst for the synthesis of highlysubstitutedimidazoles under solvent-free conditions. This one-pot procedure is very simple, and affords good to excellent yields. Furthermore, the catalyst shows good thermal stability and recyclability. The catalyst was recycled for five runs without an appreciable loss in its catalytic