反应详情

To a suspension of 6-chloro-2-(2-fluoro-4-trimethylsilanyl-phenylamino)-nicotinic acid (33.7 g, 99.5 mmol) in dichloromethane (500 mL) at 0° C. was added DIPEA (17.1 mL, 99.5 mmol). The reaction mixture was stirred for 10 minutes, then DMF (2 mL) and oxalyl chloride (8.7 mL, 99.5 mmol) were added dropwise (CAUTION: EFFERVESCENCE). The reaction mixture was stirred at room temperature for 2 hours and then added dropwise to a solution of DIPEA (17.1 mL, 99.5 mmol) in MeOH (500 mL) at 0° C. over a 45 minutes period. The reaction mixture was stirred at room temperature for 18 hours before being concentrated in vacuo. The resultant residue was dissolved in ethyl acetate and washed with a saturated aqueous solution of sodium hydrogen carbonate, followed by water, then brine, dried (Na2SO4), filtered and evaporated in vacuo to afford the title compound as a brown foam which was used without purification into the next step (36.4 g). LCMS (method B) RT=5.35 min, M+H+=353.

1. stirringThe reaction mixture was stirred at room temperature for 2 hours
2. stirringThe reaction mixture was stirred at room temperature for 18 hours
3. concentrationbefore being concentrated in vacuo
4. dissolutionThe resultant residue was dissolved in ethyl acetate
5. washwashed with a saturated aqueous solution of sodium hydrogen carbonate
6. dry with materialbrine, dried (Na2SO4)
7. filtrationfiltered
8. customevaporated in vacuo