反应详情

To a stirred light brown suspension of 5-bromo-4-methylnicotinic acid (10.00 g, 46.3 mmol) and ethanol (2.35 g, 2.97 mL, 50.9 mmol) in CH2Cl2 (231 mL) at 0° C. under Argon was added EDCI (10.9 g, 55.5 mmol) and DMAP (566 mg, 4.63 mmol), stirring was continued over night and the reaction mixture was allowed to warm up to RT. The reaction mixture was poured on aq. 10% KH2PO4 solution followed by extraction with AcOEt (3×). The organic phases were washed once with aq. 10% KH2PO4, aq. sat. NaHCO3 and with aq. sat. NaCl solution. The combined organic phases were dried (Na2SO4), filtered and evaporated to afford the title compound (9.49 g, 84%) as brown solid. MS: 244.0 (M+H+, 1Br).

1. waitwas continued over night
2. extractionfollowed by extraction with AcOEt (3×)
3. washThe organic phases were washed once with aq. 10% KH2PO4, aq. sat. NaHCO3 and with aq. sat. NaCl solution
4. dry with materialThe combined organic phases were dried (Na2SO4)
5. filtrationfiltered
6. customevaporated