Sodium alginate: A renewable and very effective biopolymer catalyst for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones

A convenient and mild methodology is described for the preparation of 3,4-dihydropyrimidin-2(1H)-ones in the presence of sodium alginate as the biopolymer catalyst. The sodium alginate was found as a novel, very mild, recyclable, efficient, eco-friendly and very noteworthy biopolymer catalyst.