反应详情

2,3-dichloro-pyrido(3,4-b)pyrazine (300 mg, 1.5 mmol, 1 eq.), benzenesulfonamide (235.8 mg, 1.5 mmol, 1 eq.) and K2CO3 (207.3 mg, 1.5 mmol, 1 eq.) are taken up in anhydrous DMA (10 ml) under argon. The reaction mixture is stirred at room temperature for 3 days, then water (15 ml) is added. The aqueous phase is washed with EtOAc (4×10 ml) then lyophilized. The solid residue obtained is extracted with DCM and the solvent is evaporated to near dryness then purified by preparative HPLC using a gradient of H2O, TFA 0.1%/ACN, TFA 0.1%, to afford 21.7 mg (5%) of the title compound. 1H NMR (DMSO-d6) δ 9.13 (s, 1H), 8.42 (d. J=6.7 Hz, 1H), 8.03-7.97 (m, 2H), 7.56 (d, J=6.8 Hz, 1H), 7.51-7.45 (m, 3H). HPLC (max plot) 95%; Rt 1.71 min. LC/MS: (ES+): 321.0, (ES−): 319.0.

1. washThe aqueous phase is washed with EtOAc (4×10 ml)
2. customThe solid residue obtained
3. extractionis extracted with DCM
4. customthe solvent is evaporated
5. customthen purified by preparative HPLC