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Biginelli compounds (ethyl 4-substituted-2-oxo-1,2,3,4-tetrahydropyrimidine-6- carboxylates) prepared from cyclodehydration of ethyl acetoacetate, urea and aromatic (or aliphatic) aldehydes have been subjected to bromination using (i) Br 2/CHCl 3 (ii) Br 2/AcOH and (iii) 2,4,4,6-tetrabromocyclohex-2-en-1-one (TBCO) separately. The last one viz ., TBCO is found to be the best reagent in preparing the 6-dibromethyl derivative in terms of yield and green context.

2,4,4,6-Tetrabromocyclohex-2,5-dien-1-one: An Excellent Reagent for Dibromination of Methyl at C-6 in Biginelli Compounds