[CH3:1][O:2][C:3]([C:5]1[CH:13]=[CH:12][C:8]([C:9]([OH:11])=O)=[CH:7][CH:6]=1)=[O:4].[NH2:14][C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1.CCN=C=NCCCN(C)C.C(N(CC)CC)C>O.C1COCC1>[NH:14]([C:9]([C:8]1[CH:7]=[CH:6][C:5]([C:3]([O:2][CH3:1])=[O:4])=[CH:13][CH:12]=1)=[O:11])[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=14-Methoxycarbonyl benzoic acid (540 mg), aniline (0.27 ml), WSC (863 mg) and triethylamine (0.84 ml) were added to THF (20 ml). After the reaction mixture was stirred at room temperature for 20 hours, the reaction mixture was placed in water, and extraction was conducted using ethyl acetate-THF (1:1). The organic layer was washed with water, saturated sodium bicarbonate solution, and saturated aqueous sodium chloride solution, dried, and then concentrated. The resulting crude crystals were recrystallized from ethyl acetate-hexane to give the titled compound (659 mg).
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