28795-33-7Relevant articles and documents
Preparation method of high-purity tinidazole
-
Paragraph 0021-0022; 0024-0025; 0027-0028; 0030-0031, (2020/10/04)
The invention discloses a synthetic preparation method of high-purity tinidazole, and belongs to the technical field of chemical pharmacy. The method includes: taking beta-hydroxyethyl sulfide and 2-methyl-5-nitroimidazole as the raw materials, using 4-methyl-2-pentanone as a solvent, conducting dehydration condensation under the action of concentrated sulfuric acid to obtain a condensation compound 2-methyl-1-(2-ethylthioethyl)-5-nitro-1H-imidazole, and then under the catalysis of sodium molybdate, performing oxidization to generate a tinidazole crude product; and decoloring and refining thecrude product with water to obtain a tinidazole finished product with purity of greater than or equal to 99.98%. Compared with the prior art, the raw materials are easy to obtain, reaction is simple,and operation is easy and convenient; meanwhile, the incompletely reacted 2-methyl-5-nitroimidazole and the recycled 4-methyl-2-pentanone can be directly applied mechanically, so that the production cost is effectively reduced, the reaction period is shortened, pollution is reduced, and the yield and the product quality are improved.
Regioselective Alkylation of 4(5)-Nitro-1H-Imidazoles in Acidic Media: Study of Temperature Effects
Rao, A. K. S. Bhujanga,Rao, C. Gundu,Singh, B. B.
, p. 2399 - 2402 (2007/10/02)
Alkylation of 4(5)-nitro-1H-imidazoles in acidic media with reactive alkylating agents such as benzyl chloride and allyl bromide resulted in the predominant formation of the 5-nitro isomers at lower temperatures (75 deg C) and the 4-nitro isomers at higher temperatures (140 deg C).With less reactive alkylating agents, only the 5-nitro isomers were produced irrespective of temperature.The mechanism was shown to involve quaternization of the initially formed 1-alkyl-5-nitro-1H-imidazoles followed by preferential dealkylation to yield the thermodynamically more stable 4-nitro-1H-imidazoles.