Solvent free synthesis of 3,4-dihydropyrimidine-2-(1H)-ones/thiones catalyzed by N,O-bis(trimethylsilyl)acetamide and dicyclohexyl carbodimide

Add time:07/30/2019    Source:sciencedirect.com

We report herein, the usage of N,O-bis(trimethylsilyl)acetamide (BSA) and dicyclohexyl carbodimide (DCC) as two new catalysts for three component condensation of an aldehyde, ethyl acetoacetate and urea/thiourea under solvent free conditions at 100 °C to afford the corresponding 3,4-dihydropyrimidine-2-(1H)-ones/thiones (DHPMs) in good to excellent yields. A comparative study of these two catalysts was made and presented.

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