反应详情

To a stirred solution of methyl 3-[(dipropylamino)carbonyl]-5-[(trimethylsilyl)ethynyl]benzoate 26 (185.3 mg, 0.49 mmol) in MeOH (2.5 mL) was added a solution of KOH (2.9 mL of a 1 M solution in H2O, 2.9 mmol). The resulting homogeneous brown solution turned to a white/brown suspension, then to a clear brown solution. The reaction mixture was stirred for 4 h, diluted with CHCl3 (40 mL), separated and the organic layer was concentrated under reduced pressure to provide 3-[(dipropylamino)carbonyl]-5-ethynylbenzoic acid 27 (141.8 mg): 1H NMR (300 MHz, CDCl3): δ 8.22 (d, J=1 Hz, 1H), 8.05 (d, J=1 Hz, 1H), 7.71 (d, J=1 Hz, 1H), 3.48 (br s, 2H), 3.17 (s, 1H), 3.16 (br s, 2H), 1.71 (d, J=7 Hz, 2H), 1.55 (d, J=7 Hz, 2H), 1.00 (d, J=7 Hz, 3H), 0.78 (d, J=7.Hz, 3H).

1. customseparated
2. concentrationthe organic layer was concentrated under reduced pressure