Reactions of ethyl 3‐aryl‐2‐benzoylpropenoates 1 with guanidine andN‐alkyl(or benzyl)guanidines have been investigated. Ethyl 2‐aminodihydro‐5‐pyrimidinecarboxylate derivatives 3, 4 or 5, and 3,7‐diethoxy‐carbonyl‐4,6‐dihydro‐2,4,6,8‐tetraaryl‐1H‐pyrimido[1,2‐a]pyrimidines6have been synthesized.
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Milcent et al. (1997) studied this question.