反应详情

(6-Bromo-4-iodo-pyridin-3-yl)-carbamic acid tert-butyl ester (13.6 g, 34.1 mmol) was dissolved in dichloromethane (150 mL) and trifluoroacetic acid (50 mL) was then added. The resultant solution was stirred at ambient temperature for 2 h then evaporated under reduced pressure. The resultant residue was treated with a saturated solution of sodium hydrogen carbonate and the resultant solid was treated with water (50 mL) then extracted with ethyl acetate (2×200 mL). The combined organic layer was dried over anhydrous sodium sulfate, filtered and evaporated under reduced pressure to afford the title compound as an off-white solid (10.0 g, 98%). 1H NMR (CDCl3, 300 MHz): 7.81 (s, 1H), 7.73 (s, 1H), 4.14 (s, 2H). LCMS (Method B): RT=3.03 min, M+H+=299/301.

1. customthen evaporated under reduced pressure
2. additionThe resultant residue was treated with a saturated solution of sodium hydrogen carbonate
3. additionthe resultant solid was treated with water (50 mL)
4. extractionthen extracted with ethyl acetate (2×200 mL)
5. dry with materialThe combined organic layer was dried over anhydrous sodium sulfate
6. filtrationfiltered
7. customevaporated under reduced pressure