Organic reactions in ionic liquids:A simple Highly regioselective or regiospecific substitutions of benzotriazole

摘要

In theabsence of any added base in ionic liquids [Bmim][BF_4],benzotriazole replaces the halogen aotm of an alpha-halogenated ketone or alpha-halogenated carboxylic ester to give the corresponding N-1-substituted benzotriazole as th eonly isomer,and 1-chloro-2,4-dinitrobenzene reacted similarly with benzotriazole to afford the N-1-substituted benzotriazole in a good yield.Alkyl halides reacted regioselectively to afford the N-1-alkylbenzotriazole in ratios of more htan 15 to 1 over the N-2-isomer.