反应详情

To a solution of 4′-chloro-3-methoxy-biphenyl-4-carboxylic acid, 9, (0.325 g, 1.24 mmol) in CH2Cl2 (5 mL) and DMF (1.5 mL) at room temperature under N2 is added glycine ethyl ester hydrochloride (0.19 g, 1.36 mmol), 1-(3-dimethylamino-propyl)-3-ethylcarbodiimide (EDCI) (0.261 g, 1.36 mmol), 1-hydroxybenzotriazole (HOBt) (0.033 g, 0.248 mmol) and diisopropylethylamine (DIPEA) (0.432 ml, 2.28 mmol). The resulting suspension is stirred for 16 hours after which the reaction mixture is diluted with EtOAc and washed with 1M HCl, 1M NaOH and saturated aqueous NaCl. The organic phase is separated, dried (MgSO4), filtered and concentrated under reduced pressure. The crude material is purified over silica (hexanes:EtOAc 1:1) to afford 0.364 g (85% yield) of the desired product as a colorless solid. 1H NMR (400 MHz, CDCl3) δ ppm 8.51 (1 H, br s), 8.28 (1 H, d, J=8.1 Hz), 7.53-7.57 (2 H, m), 7.42-7.46 (2 H, m), 7.27 (1 H, dd, J=8.1, 1.6 Hz), 7.14 (1 H, d, J=1.5 Hz), 4.29 (2 H, d, J=4.8 Hz), 4.28 (2 H, q, J=7.1 Hz), 4.09 (3 H, s), 1.34 (3 H, t, J=7.2 Hz). HPLC-MS: m/z 348 [M+H]+.

1. washwashed with 1M HCl, 1M NaOH and saturated aqueous NaCl
2. customThe organic phase is separated
3. dry with materialdried (MgSO4)
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe crude material is purified over silica (hexanes:EtOAc 1:1)