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.