Abstract A number of N-aryl and N-alkyl substituted piperazines 1 were prepared from variously substituted 2-oxazolidinone derivatives 3. The method involved treatment of 3 with HBr in glacial acetic acid followed by heating the resulting ring-opened salts 5 in alcoholic solvent. The piperazines 1a–1q were isolated by crystallization in yields ranging from 23– 91%.
