摘要:
                                1-Methyl-2-chloromethyl-5-nitroimidazole reacts by an S(RN)1 mechanism with various aliphatic, cyclic or heterocyclic nitronate anions to afford, in high yields, new 5-nitroimidazoles bearing a trisubstituted ethylenic double bond at the 2 position.  Some of these compounds are as active as metronidazole in vitro and in vivo against protozoa and anaerobic bacteria.  Structure-activity relationships are discussed.