反应详情

温度

110 °C

A mixture of 3-chloro-4-propoxybenzoic acid (0.298 g, 0.93 mmol), the product of Step A (0.2 g, 0.93 mmol) and EDC (0.214 g, 1.1 mmol) in anhydrous DMF (3 ml) was stirred overnight at 45° C. 1 M TBAF in THF (0.3 ml) was added and this was stirred for 2.5 h at 110° C. The reaction mixture was diluted to 20 ml with H2O and extracted with EtOAc (2×15 ml). The organic layer was separated, dried over MgSO4 and filtered. The filtrate was distilled off and the residue was purified by FCC (SiO2, hexane/EtOAc) to give the title compound (0.22 g, 47.4%), as a colourless solid. 1H-NMR (CDCl3) 8.56 (d, 1H, J=2.04 Hz); 8.21 (d, 1H, J=2.37 Hz); 8.07-8.02 (m, 2H); 7.00 (d, 1H, J=8.73 Hz); 6.87 (d, 1H, J=8.67 Hz); 4.68-4.63 (m, 1H); 4.08 (t, 2H, J=6.45 Hz); 1.93-1.87 (m, 2H); 1.36 (d, 6H, J=6.06 Hz); 1.09 (t, 3H, J=7.44 Hz).

1. extractionextracted with EtOAc (2×15 ml)
2. customThe organic layer was separated
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. distillationThe filtrate was distilled off
6. customthe residue was purified by FCC (SiO2, hexane/EtOAc)