compound introduction
2-Chlorobenzimidazole can be synthesized by reacting benzimidazole-2-one with phosphoryl chloride in the presence of phenol； Application： 2-Chlorobenzimidazole can be used to synthesize the following: 1-methyl-2-chlorobenzimidazole via reaction with dimethyl sulfate； 1-ethyl-2-chlorobenzimidazole via reaction with diethyl sulfate； 1-benzyl-2-chlorobenzimidazole via reaction with benzyl chloride； 2-chloro-4,5,6,7-tetrabromobenzimidazole via bromination with bromine； It may be used as a building block to synthesize 4-amino-6-benzimidazole-pyrimidines；
