反应详情

A solution of tert-butyl 3-amino-2-(4-methoxybenzyl)propanoate (50 mg, 0.188 mmol), 1-(2-(benzyloxy)-2-oxoethyl)cyclopentanecarboxylic acid (49.4 mg, 0.188 mmol), EDC (47.0 mg, 0.245 mmol) and HOAt (33.3 mg, 0.245 mmol) in DMF (2 ml) was allowed to stir at room temperature for 3 hours. The reaction mixture was diluted with H2O and EtOAc. To the organic layer was added NH4OH (6 ml) and washed with brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The obtained residue was purified by flash column chromatography on silica gel (eluent: heptane/EtOAc=100:0 to 50:50) to give tert-butyl 3-(1-(2-(benzyloxy)-2-oxoethyl)cyclopentanecarboxamido)-2-(4-methoxybenzyl)propanoate (56.3 mg); Retention time=1.61 minutes (condition B); MS (m+1)=510.5; 1H NMR (400 MHz, CDCl3) δ ppm 1.37 (s, 9H) 1.57-1.70 (m, 6H) 2.00-2.04 (m, 2H) 2.66-2.86 (m, 5H) 3.24-3.47 (m, 2H) 3.77 (s, 3H) 5.08 (s, 2H) 6.36-6.39 (m, 1H) 6.79-6.82 (m, 2H) 7.07-7.11 (m, 2H) 7.30-7.34 (m, 5H).

1. washwashed with brine
2. dry with materialdried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure
5. customThe obtained residue was purified by flash column chromatography on silica gel (eluent: heptane/EtOAc=100:0 to 50:50)