反应详情

温度

85 °C

(2-Carboxy-2-methylpropyl)phenylboronic acid (608 mg), 2-chloro-N-isobutoxycarbonyl-N-(3-methoxy-5-methylpyrazin-2-yl)pyridine-3-sulphonamide (1.03 g) and sodium carbonate (583 mg) were added to a mixture of toluene (25 ml) ethanol (25 ml) and water (10 ml). The mixture was deoxygenated by alternatively bubbling argon through and evacuating (3 cycles) and tetrakis(triphenylphosphine)palladium(0) (100 mgs) was added. The reaction mixture was heated to 85° C. for 18 hours, cooled to ambient temperature and partitioned between water (15 ml) and ethyl acetate (25 ml). The organic phase was extracted with saturated aqueous sodium carbonate solution (15 ml) and the combined aqueous phases were washed with ethyl acetate (15 ml). The aqueous phase was acidified with 2M hydrochloric acid to pH 1 and extracted with ethyl acetate (3×30 ml). The combined organic extracts were dried (MgSO4) and evaporated to give 2-[4-(2-carboxy-2-methylpropyl)phenyl]-N-(isobutoxycarbonyl)-N-(3-methoxy-5-methylpyrazin-2-yl)pyridine-3-sulphonamide (495 mg); 1H NMR (d6 -DMSO): 0.6 (d, 6 H), 1.10 (s, 6 H), 1.51-1.69 (m, 1 H), 2.52 (s-partly obscured by DMSO), 2.87 (s, 2 H), 3.82 (d, 2 H), 3.95 (s, 3 H), 7.20 (d, 2 H), 7.43 (d, 2 H), 7.79 (dd, 1 H), 8.16 (s, 1 H), 8.84-8.97 (m, 2 H); mass spectum (+ve ESP) 557.2 (M+H)+.

1. customThe mixture was deoxygenated by alternatively bubbling argon through and
2. customevacuating (3 cycles) and tetrakis(triphenylphosphine)palladium(0) (100 mgs)
3. additionwas added
4. temperaturecooled to ambient temperature
5. custompartitioned between water (15 ml) and ethyl acetate (25 ml)
6. extractionThe organic phase was extracted with saturated aqueous sodium carbonate solution (15 ml)
7. washthe combined aqueous phases were washed with ethyl acetate (15 ml)
8. extractionextracted with ethyl acetate (3×30 ml)
9. dry with materialThe combined organic extracts were dried (MgSO4)
10. customevaporated