[CH3:1][N:2]1[C:6]2[CH:7]=[CH:8][C:9]([C:11]([OH:13])=[O:12])=[CH:10][C:5]=2[N:4]=[N:3]1.[CH3:14][N:15]1[C:19](O)=[CH:18][CH:17]=[N:16]1.C(#N)C.C(Cl)CCl>CN(C1C=CN=CC=1)C.O.C(N(CC)CC)C>[CH3:1][N:2]1[C:6]2[CH:7]=[CH:8][C:9]([C:11]([O:13][C:19]3[N:15]([CH3:14])[N:16]=[CH:17][CH:18]=3)=[O:12])=[CH:10][C:5]=2[N:4]=[N:3]11.5 g of 1-methylbenzotriazole-5-carboxylic acid (8.5 mmol) and 0.87 g of 1-methyl-5-hydroxypyrazole (8.9 mmol) were dissolved in 70 ml of abs. acetonitrile and admixed with 1.62 g of EDC (8.5 mmol), 2 ml of triethylamine and a catalytic amount of DMAP. After the reaction had ended, the solution was poured into water and the mixture was extracted with ethyl acetate. The organic phase was washed and dried, and the product was then purified by crystallization. Yield: 0.77 g (35%).
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