Patent ID: 7459552

Claim:
A method for producing a cyclic diamine derivative represented by formula (3) or a salt thereof, comprising: reacting a compound represented by formula (1): with a thiol derivative represented by formula (2a) or (2b): in the presence of a phosphorus compound, wherein Ar represents a phenyl group, a pyridyl group, or a pyrimidinyl group, any of which may have a substituent; X represents NH, S, or O; ring A represents a benzene ring or a pyridine ring, which may have a substituent; 1 represents an integer of 1 or 2; m represents an integer of 1 or 2; and n represents an integer of 1 to 6, and the phosphorus compound is a reagent selected from the group consisting of a phosphine reagent, a phosphorus reagent formed of a phosphine and an azo compound, a phosphorus reagent formed of a phosphine and an ethylenedicarboxylic acid and a phosphonium ylide reagent.