Tolvaptan intermediate and preparation method thereof

The invention relates to the field of pharmaceutical chemistry and particularly discloses preparation methods for a tolvaptan intermediate 1-(4-amino-2-methylbenzoyl)-7-chloro-5-oxo-2,3,4,5-tetrahydro-1H-1-benzoazepine (I) (shown in the description) and salts thereof. The tolvaptan intermediate prepared by utilizing the method disclosed by the invention has the characteristics of low cost, high yield, environmental friendliness, strong operability and suitability for industrial production.