Ll. Lai et al., Reaction of piperazine with trimethylacetic arylcarboxylic anhydride; A convenient method for preparing monoacylated piperazine derivatives, SYNTHESIS-S, (3), 2001, pp. 361-363
A series of monosubstituted piperazine derivatives were obtained by the rea
ction of piperazine with trimethylacetic arylcarboxylic anhydrides in good
yields, which were prepared in situ from arylcarboxylic acid with trimethyl
acetyl chloride in the presence of triethylamine.