Method for preparing phenazine compound by catalyzing o-halogeno aniline in water phase

The invention provides a method for preparing a phenazine compound by catalyzing o-halogeno aniline in a pure water phase. By using a water soluble coordination compound as a catalyst, the phenazine compound is prepared by efficiently catalyzing the o-halogeno aniline in the pure water phase. The invention provides a novel method for preparing the phenazine compound, which has the advantages of environment friendliness, simplicity and convenience for operation, safety, low price and high efficiency. Compared with the prior art, the method provided by the invention is not only applicable to a large quantity of functional groups but also has the advantages of simplicity in operation, high yield, single product, convenience for separation and purification, safety, low price and less pollution. The catalyst is as follows: (1) an in-situ catalyst formed by a copper salt and 2-pyridine carboxylic acid, and (2) a coordination compound.