The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 5-Chloro-1-methyl-4-nitroimidazole( cas:4897-25-0 ) is researched.Reference of 5-Chloro-1-methyl-4-nitroimidazole.Yan, Qiu-mei; He, Bin; Pan, Fu-you published the article 《Process improvement on the synthesis of 5-chloro-1-methyl-4-nitroimidazole》 about this compound( cas:4897-25-0 ) in Hecheng Huaxue. Keywords: nitroimidazole preparation. Let’s learn more about this compound (cas:4897-25-0).
5-Chloro-1-methyl-4-nitroimidazole in overall yield of 61.3% was synthesized from di-Et oxalate by a four-step reaction of amination, cyclization, salt formation, and nitration. The structure was characterized by NMR, IR and MS. Two improvements were that 30%∼40% methylamine aqueous solution was substituted for methylamine gas in amination, and crystal of 5-chloro-1-methylimidazole nitrate was separated out by adding nitric acid into acetone solution of cyclization product in salt formation.
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Reference:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts