The SN2 reactions having a symmetrical transition state were studied in a dipolar aprotic solvent. A good Hammett correlation was found for the chlorine isotopic exchangereactions in acetonitrile between tetraethylammonium chloride and three types of substituted methyl chlorides, 2-arylethyl chlorides, chloromethyl aryl ethers, and chloromethyl aryl sulfides. The reaction constant was positive for
[EN] PROCESS FOR PRODUCTION OF 2-CHLORO-4-NITROIMIDAZOLE DERIVATIVES<br/>[FR] PROCÉDÉ DE PRODUCTION DE DÉRIVÉS DE 2-CHLORO-4-NITROIMIDAZOLE
申请人:OTSUKA PHARMA CO LTD
公开号:WO2019146113A1
公开(公告)日:2019-08-01
An improved process for preparing 2-chloro-4-nitroimidazole derivatives which are useful intermediates in the preparation of an anti-tuberculosis drug is provided. The process may comprise the step of chlorinating nitroimidazoles with a chlorinating agent and an activating agent to give 2-chloro-4-nitroimidazole derivatives.
Amino-benzimidazole derivatives of the structure ##SPC1## Are provided which are useful as anti-inflammatory agents. In addition, a method for preparing such compounds, pharmaceutical compositions containing such compounds, and methods for using such pharmaceutical compositions in the treatment of inflammation are taught.