A convenient two-step, one-pot synthesis of 4-chloro-2-(trichloromethyl)pyrimidines
starting from 2-(trichloromethyl)-1,3-diazabutadienes is described. These nitrogen
heterocycles were prepared by a sequential acylation/intramolecular cyclization reaction
between 2-(trichloromethyl)-1,3-diazabutadienes and acyl chlorides in the presence
of triethylamine followed by treatment with POCl3. This is the first report for the synthesis of this type of 4-chloro-2-(trichloromethyl)pyrimidine
derivatives and serves as a source for a wide variety of other substituted pyrimidines
by nucleophilic substitution reactions.
Key words
cycloaddition reaction - tetrachloropyrimidines - 1,3-diazadienes - intramolecular
cyclization - nucleophilic substitution