A new In–SiO2 composite catalyst in the solvent-free multicomponent synthesis of Ca2+ channel blockers nifedipine and nemadipine B
作者:Ricardo F. Affeldt、Edilson V. Benvenutti、Dennis Russowsky
DOI:10.1039/c2nj40060j
日期:——
An InâSiO2 composite was prepared by the solâgel method and was applied as a heterogeneous Lewis acid catalyst in the multicomponent Hantzsch synthesis of symmetrical and non-symmetrical 1,4-DHPs. The Ca2+ channel blockers nifedipine and nemadipine B were synthesized in a single step through a solvent-free protocol.
Ceric Ammonium Nitrate (CAN) catalyzes the one-pot synthesis of polyhydroquinoline via the Hantzsch reaction
作者:Shengkai Ko、Ching-Fa Yao
DOI:10.1016/j.tet.2006.05.037
日期:2006.7
A facile and efficient one-pot synthesis of high yields of polyhydroquinoline derivatives at ambient temperature using Ceric Ammonium Nitrate (CAN) as catalyst via the Hantzschreaction was reported. The process is simple and environmentally benign and the catalyst is commercially available and inexpensive.
Combined Thiourea Dioxide–Water: An Effective Reusable Catalyst for the Synthesis of Polyhydroquinolines via Hantzsch Multicomponent Coupling
作者:Neeraj Kumar、Sanny Verma、Suman L. Jain
DOI:10.1246/cl.2012.920
日期:2012.9.5
Thiourea dioxide in water was found to be an efficient and reusable organocatalytic system for the one-pot synthesis of polyhydroquinoline derivatives via the Hantzsch-type coupling of aldehyde, dimedone, acetoacetate, and ammonium acetate under mild reaction conditions. Operational simplicity, the use of an economically affordable catalyst, environmentally benign conditions, high product yields, and reusability of the catalyst system were the advantageous features of the developed method.