[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:11]=[CH:12][C:13]([OH:15])=O)[CH:6]=[CH:7][C:8]=1[O:9][CH3:10].C(N1C=CN=C1)(N1C=CN=C1)=O.O[NH:29][C:30](=[NH:38])[CH2:31][C:32]1[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=1.O>CN(C=O)C>[CH2:31]([C:30]1[N:38]=[C:13]([CH:12]=[CH:11][C:5]2[CH:6]=[CH:7][C:8]([O:9][CH3:10])=[C:3]([O:2][CH3:1])[CH:4]=2)[O:15][N:29]=1)[C:32]1[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=13-(3,4-Dimethoxy-phenyl)-acrylic acid (compound of Example 2, Method A, Step 1; 2.0 g, 9.6 mmol) was dissolved in DMF (20 mL) to which 1,1′-carbonyldiimidazole (CDI) (1.71 g, 10.56 mmol) was added and the reaction mixture was stirred at room temperature. At the end of 3 h, N-hydroxy-2-phenyl-acetamidine (1.58 g, 10.56 mmol) was added and the reaction mixture was stirred at room temperature for 8 h. After the completion of the reaction, additional CD (1.71 g, 10.56 mmol) was added and the reaction mixture was refluxed at 110° C. to 120° C. for 8 h to effect cyclodehydration. DMF was evaporated and the residue obtained was cooled to room temperature followed by addition of water (15 mL). The resulting mixture was extracted with ethyl acetate (3×10 mL). The combined organic layers were washed with water (2×10 mL) and brine (10 mL). The organic phase obtained was dried over anhydrous sodium sulfate and concentrated to afford the title compound.
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