Darzens Reaction in the Synthesis of 3-(α-Chloroalkyl)quinoxalin-2(1H)-ones.

A two-stage method was developed for the synthesis of 3-(α-chloroalkyl- and α-chlorophenylalkyl)-quinoxalin-2(1H)-ones proceeding from methyl chloroalkyl- and chlorophenylalkylpyruvates obtained by Darzens reaction from methyl dichloroacetate and appropriate aldehydes in the presence of t-BuOK.