Using 2-(tert-butoxycarbonylamino)-5-carboxyindan (30 mg, 0.11 mmol) synthesized in Preparation Example 4, aniline (21 μl, 0.23 mmol), triethylamine (0.20 ml, 1.4 mmol), propanephosphonic acid anhydride (0.3 ml), dimethylaminopyridine (a catalytic amount) and methylene chloride (0.25 ml), a similar procedure to a) in Example 29 was carried out. The product obtained was purified by silica gel chromatography (hexane:ethyl acetate=4:1 to 7:3) to obtain N-phenyl-2-(tert-butoxycarbonylamino)-5-indan carboxamide (27 mg, 0.077 mmol) having the following physical properties:
