Patent ID: 8183365

Claim:
A method for preparing a compound of the formula (I) the method comprising: dehydrogenating a compound of the formula (II) or a salt thereof, with 2-iodoxybenzoic acid in an organic solvent, wherein X 1 is an aryl hydrocarbon group optionally substituted with one or more groups independently selected from —R, —NH 2 , —NHR, —NR 2 , —OH, —OR, —F, —Cl, —Br, —I, —CF 3 , —C(═O)OH, —C(═O)OR, —C(═O)NH 2 , —C(═O)NHR, and —C(═O)NR 2 ; X 2 is —H, —R, —NH 2 , —NHR, —NR 2 , —OR, —F, —Cl, —Br, or —I; and R is C 1 to C 10 hydrocarbyl.