The invention discloses a key
clozapine intermediate synthesis method and belongs to the field of
drug synthesis. The key
clozapine intermediate synthesis method comprises the steps that N-(2-halogenated-5-chlorphenyl) amino
formic acid and
aniline are used as starting raw materials, the
aniline serves as a
solvent, and 8-
chlorine-5,10-dihydro-11H-dibenzo [b,e][1,4]-dinitrogen(shown in the description)-11-
ketone is obtained through reaction under the effects of a catalyst and alkali. The key
clozapine intermediate synthesis method has the positive and progressive advantages that the novel method for synthesis of the 8-
chlorine-5,10-dihydro-11H-dibenzo [b,e][1,4]-dinitrogen(shown in the description)-11-
ketone overcome lots of shortcomings in the prior art, adopts simple steps and only needs one-step reaction, the yield is up to 90% or above; the
aniline is a reaction
solvent and is also a
raw material, can not only make reaction of the
raw material (2-halogenated-3-pyridyl)
carbamic acid complete, but also increase the yield of reaction, cost increase and environmental
pollution brought by usage of other solvents are further avoided, the excessive aniline can be continuously used after being poste-treated and evaporated out, the cost is greatly saved, the environment is protected, and the key clozapine intermediate synthesis method has a good industrialized prospect.