[NH2:1][C:2]1[N:10]=[C:9]([NH2:11])[CH:8]=[CH:7][C:3]=1[C:4](O)=[O:5].CC[N:14]=C=NCCCN(C)C.C1C=CC2N(O)N=NC=2C=1.[Cl-].[NH4+].C(N(C(C)C)CC)(C)C>O.CS(C)=O>[NH2:1][C:2]1[N:10]=[C:9]([NH2:11])[CH:8]=[CH:7][C:3]=1[C:4]([NH2:14])=[O:5]2,6-Diaminonicotinic acid (1.5 g), WSC (2.8 g), HOBt (2.0 g), ammonium chloride (1.6 g), diisopropylethylamine (7.6 g), and DMSO (45 mL) were stirred for 15 hours at room temperature. Water was added to the reaction solution, which was then extracted with ethyl acetate. The organic layer was concentrated and purified by silica gel chromatography (ethyl acetate, then ethyl acetate:methanol=4:1). The organic layer thus obtained was concentrated and purified by NH silica gel column chromatography (ethyl acetate). Ethyl acetate and hexane were added to the residue thus obtained, and the solids were filtered off to obtain the titled compound (1.1 g).
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