反应详情

A solution of 4-(biphenyl-4-yl)-3-(tert-butoxycarbonylamino)butanoic acid (250 mg, 0.703 mmol), t-BuOH (0.135 ml, 1.407 mmol), EDCl (270 mg, 1.407 mmol) and 4-dimethylaminopyridine (86.0 mg, 0.704 mmol) in DCM (7 ml) was allowed to stir at room temperature under nitrogen for 62 hours. The reaction was quenched with water, and the organic layer was separated and concentrated under reduced pressure. The obtained residue was purified by flash column chromatography on silica gel to give tert-butyl 4-(biphenyl-4-yl)-3-(tert-butoxycarbonylamino)butanoate (110 mg); HPLC retention time=1.77 minutes (condition B); MS (ES+)=412.1 (m+1) 300.0 (m-tBux2+3; 100%); 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.41 (s, 9H) 1.47 (s, 9H) 2.36 (A of ABX, Jab=15.5 Hz, Jax=6.2 Hz, 1H) 2.44 (B of ABX, Jab=15.5 Hz, Jbx=5.6 Hz) 2.82-2.94 (m, 2H) 4.11-4.17 (m, 1H) 5.08-5.10 (m, 1H) 7.25-7.34 (m, 3H) 7.41-7.44 (m, 2H) 7.51-7.58 (m, 4H).

1. customThe reaction was quenched with water
2. customthe organic layer was separated
3. concentrationconcentrated under reduced pressure
4. customThe obtained residue was purified by flash column chromatography on silica gel