反应详情

To the solution of 4-(2-methylsulfanyl-benzothiazol-6-yloxy)-pyridine-2-carboxylic acid methylamide from step 3 (3.88 g, 11.72 mmol, 1.0 eq) in DCM (20 mL) at 0° C., was added MCPBA (77%, 2.88 g, 1.1 eq). The mixture was stirred at this temperature for one hour. Saturated sodium bicarbonate solution (100 mL) was added. The aqueous layer was extracted with DCM (3×150 mL). The organic layer was dried over sodium sulfate, filtered, and evaporated in vacuo to yield 4-(2-methanesulfinyl-benzothiazol-6-yloxy)-pyridine-2-carboxylic acid methylamide as white powder in quantitative yields. The crude product was used in the next step without purification. M+H=348.0.

1. extractionThe aqueous layer was extracted with DCM (3×150 mL)
2. dry with materialThe organic layer was dried over sodium sulfate
3. filtrationfiltered
4. customevaporated in vacuo