Patent ID: 7759491

Claim:
A method for producing an indazol-3-ylmethyl phosphonium salt represented by Formula (IV): [wherein, X represents halogen, ONO 2 , OSO 3 H, OSO 2 R a (wherein R a represents substituted or unsubstituted lower alkyl, substituted or unsubstituted aryl, or a substituted or unsubstituted aromatic heterocyclic group), or OC(═O)R b (wherein R b has the same meaning as the above R a ), and R 1 , R 2 and R 3 may be the same or different and each represents substituted or unsubstituted aryl or a substituted or unsubstituted aromatic heterocyclic group] or a salt thereof, which comprises reacting a compound represented by Formula (I): a compound represented by Formula (II): H—X (II), and a compound represented by Formula (III):