Regioselective chlorination of the phenyl ring of 4,5-dihydro-1-phenyl-1H-1,2,4-triazol-5-ones
申请人:Framroze Bomi Patel
公开号:US20130072689A1
公开(公告)日:2013-03-21
An improved process for selectively chlorinating 4,5-dihydro-1-phenyl-1H-1,2,4-triazole-5-ones, including 4,5-dihydro-3-alkyl-1-phenyl-1H-1,2,4-triazole-5-ones and 4-haloalkyl-4,5-dihydro-3-alkyl-1-phenyl-1H-1,2,4-triazole-5-ones in the 4-position of the phenyl ring by dissolving the compounds in a synergistic ratio of polar aprotic solvents, preferably acetonitrile and N,N-dimethylformamide in a 7:3 ratio and reacting the solution with chlorine gas.
一种改进的方法,用于选择性氯化4,5-二氢-1-苯基-1H-1,2,4-三唑-5-酮,包括4,5-二氢-3-烷基-1-苯基-1H-1,2,4-三唑-5-酮和4-卤代烷基-4,5-二氢-3-烷基-1-苯基-1H-1,2,4-三唑-5-酮在苯环的4位通过将化合物溶解在极性无水溶剂的协同比例中,优选为乙腈和N,N-二甲基甲酰胺的7:3比例,并将溶液与氯气反应。