反应详情

2-Hydroxy-4-cyano-pyridine (240 mg, 2 mmol, 1 equiv.) was dissolved in DMF (6 ml), K2CO3 (415 mg, 3 mmol, 1.5 equiv.) and NaI (60 mg, 0.4 mmol, 0.2 equiv.) were added and the mixture was stirred at r.t. for 10 min. 5-Chloro-2-(chloromethyl)-1,3-benzothiazole (436 mg, 2 mmol, 1 equiv.) was added and the reaction mixture was stirred at 60° C. for 3 h and at r.t. overnight. By addition of H2O, brown solid precipitated, which was filtered, rinsed with H2O, dried and re-crystallised from CH3CN. Yield 280 mg (46%), mp 224-227° C., HPLC-MS (method 1): m/z 302 [M+H]+, Rt=3.80 min. By 13C-NMR analysis it was identified to be the N-alkylated derivative (Scheme 24). The DMF-H2O mother liquors were evaporated to dryness under reduced pressure and the residue was purified by column chromatography on silica, eluted with EtOAc/hexane (10%-100% gradient) to give 45 mg (7.5% yield) of a brown solid, HPLC-MS (method 1): m/z 302 [M+H]+, Rt=4.86 min. By 13C-NMR analysis, it was identified to be the desired O-alkylated derivative (Scheme 24).

1. stirringthe reaction mixture was stirred at 60° C. for 3 h and at r.t. overnight
2. customprecipitated
3. filtrationwhich was filtered
4. washrinsed with H2O
5. customdried
6. customre-crystallised from CH3CN
7. customThe DMF-H2O mother liquors were evaporated to dryness under reduced pressure
8. customthe residue was purified by column chromatography on silica
9. washeluted with EtOAc/hexane (10%-100% gradient)