One-pot synthesis of dihydropyrimidiones catalyzed by strontium(II) triflate under solvent-free conditions

A simple, efficient and practical procedure for the Biginelli reaction using strontium(II) triflate [Sr(OTf)2] as a novel catalyst is described under solvent-free conditions in high yields. The catalyst exhibited remarkable reactivity and reusable activity. Some of the dihydropyrimidiones showed strong pesticidal activity.