Extension of the Biginelli-Type Reaction: One-Pot Synthesis of Pyrimido-pyrimidines and Spirobi[pyrimidine]s Using Potassium Hydrogen Sulfate as a Catalyst
Silica functionalized sulfonic acid catalyzed one-pot synthesis of 4,5,8a-triarylhex-ahydropyrimido[4,5-d]pyrimidine-2,7(1H,3 H)-diones under liquid phase catalysis
作者:Princy Gupta、Vineet Kumar、Satya Paul
DOI:10.1590/s0103-50532010000200022
日期:——
SiO2-SO3H catalyzed one-pot synthesis of 4,5,8a-triarylhexahydropyrimido[4,5-d]pyrimidine-2,7(1H,3H)-diones (4a-k) is reported under liquid phase catalysis. The catalyst is easily prepared, highly stable, very simple to handle and recycled for five times without loss of significant activity.