Cl[C:2]1[C:7]([O:8][C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][C:10]=2[O:15][CH3:16])=[C:6]([Cl:17])[N:5]=[C:4]([C:18]2[N:23]=[CH:22][CH:21]=[CH:20][N:19]=2)[N:3]=1.[K+].[CH2:25]([S:28]([NH-:31])(=[O:30])=[O:29])[CH2:26][CH3:27].Cl>CS(C)=O>[Cl:17][C:6]1[N:5]=[C:4]([C:18]2[N:23]=[CH:22][CH:21]=[CH:20][N:19]=2)[N:3]=[C:2]([NH:31][S:28]([CH2:25][CH2:26][CH3:27])(=[O:30])=[O:29])[C:7]=1[O:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][C:10]=1[O:15][CH3:16]To a solution of 4,6-dichloro-5-(2-methoxy-phenoxy)-[2,2′]bipyrimidinyl (prepared as described in [6] and [11]) (1.74 g) in DMSO (5 ml) was added n-propanesulfonamide potassium salt (1.77 g). Stirring was continued for 10 days at rt. The reaction mixture was poured onto ice/water and acidified by 2N HCl. The precipitate was filtered off, washed with water and dried at HV to give n-propanesulfonic acid [6-chloro-5-(2-methoxy-phenoxy)-[2,2′]bipyrimidinyl-4-yl]-amide (2.17 g) as a white powder. LC-MS: tR: 4.14, [M+H]+: 434.13.
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