反应详情

N-[4-Fluoro-3-(trifluoromethyl)-benzyl]-N-(3-methylbenzo[b]thiophen-2-yl)-4-carboxy-benzenesulfonamide (not shown). A 3-L 4-neck flask equipped with an overhead mechanical stirrer, N2 inlet/outlet adapter, condenser and thermocouple was charged with MeOH (1.9 L) and compound 141 (190 g, 0.35 mol) followed by 3M NaOH (412 mL, 1.2 mol) and the reaction mixture was refluxed for 2 h. The reaction mixture was cooled to room temperature, diluted with EtOAc (2 L) and 1N HCl (2 L), the layers separated and the aqueous phase extracted with EtOAc (2 L). The organic extracts were combined, washed with brine (1.5 L), dried over Na2SO4, filtered and evaporated under reduced pressure. The yellow solid was placed in vacuum oven for 18 h at 50° C. to afford 158 g of the titled compound (not shown) as a yellow solid. 1H-NMR (DMSO-d6): δ 13.63 (s, 1H), 8.19 (d, 2H), 8.01 (d, 2H), 7.86-7.83 (m, 1H), 7.71-7.63 (m, 3H), 7.49-7.37 (M, 3H), 4.89 (br s, 1H), 1.95 (s, 3H).

1. customA 3-L 4-neck flask equipped with an overhead mechanical stirrer, N2 inlet/outlet adapter, condenser
2. temperaturethe reaction mixture was refluxed for 2 h
3. customthe layers separated
4. extractionthe aqueous phase extracted with EtOAc (2 L)
5. washwashed with brine (1.5 L)
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. customevaporated under reduced pressure