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Green Synthesis and Characterization of Dihydropyrimidinone Derivatives using Fruit Juice.

A simple and precise green synthesis method that has been used to synthesis of dihydropyrimidinone (DHPMs) derivatives. The reaction involves three-component one-pot condensation of an aromatic aldehyde, β-ketoester and urea in lemon juice. A large number of Dihydropyrimidinone (DHPM) derivatives were synthesized using urea, ethyl acetoacetate with electron rich as well as electron deficient aromatic aldehydes. The different type of aldehyde used like benzaldehyde, 4-Chliorobenzaldehyde, 4-methoxybenzaldehyde, anisaldehyde, cinnamaldehyde, and salicyaldehyde etc. The fruit juice like orange, amla, lime juice without processing is used as catalyst. The recrystallized products obtained were identified using physical and spectroscopic techniques UV-Visible, IR, 1 HNMR etc. The yield of these reactions were found comparatively good and in the range of (80–95%). The advantage of this method is to initiate green chemistry approach in new researchers. The excellent yield, short time, operational simplicity, and the avoidance of the use of organic solvents and friendly preparation etc are the importance of the present work.