Ultrasound-accelerated synthesis of 1,4-dihydropyridines in an ionic liquid

Abstract

Hantzsch 1,4-dihydropyridine compounds were synthesized efficiently in high yields at room temperature within short times in 1,1,3,3-N,N,N′,N′- tetramethylguanidinium trifluoroacetate as ionic liquid using ultrasound irradiation. The ionic liquid can be recovered conveniently and reused efficiently. © Springer-Verlag 2006.