Amidines react in the presence of NaHCO3 with β-chlorovinyl ketones, prepared regioselectively by the reaction of 2-acetylcyclo- pentanone-type diketones with PPh3-CCl4 in 73–78% yield, to afford 2-alkyl (aryl)-pyrimidines annelated with cyclopentane derivatives in 79–87% yields.
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Popov et al. (2001) studied this question.
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