Solid phase synthesis of dihydropyrimidinones and pyrimidinone carboxylic acids from malonic acid resin
作者:Bruce C. Hamper、Kevin Z. Gan、Thomas J. Owen
DOI:10.1016/s0040-4039(99)00961-2
日期:1999.7
Malonicacidresin 1 and the corresponding diester 2 have been used for the preparation of dihydropyrimidinones 6 and pyrimidinone carboxylic acids 8. Knoevenagel condensation of the unsymmetrical resin bound malonate diester 2 followed by condensation with amidines provides dihydropyrimidinone carboxylate esters 4. Cleavage of 4 with TFA afforded the carboxylic acid 5 which undergoes decarboxylation