Ammonium Hydroxide → 3-Phthalimido-3-(4-benzyloxy-3-methoxyphenyl)propionamide

Participants

Reaction Steps

A mixture of 3-phthalimido-3-(4-benzyloxy-3-methoxyphenyl)propionic acid (1.00 g, 2.32 mmol), carbonyldiimidazole (0.406 g, 2.50 mmol) and a catalytic amount of dimethylaminopyridine in 20 mL of dry tetrahydrofuran under nitrogen was stirred for 1 hour. To the reaction solution was then added 0.25 mL of concentrated amrnonium hydroxide. After 15 minutes, the reaction mixture was concentrated in vacuo to an oil which was diluted with 20 mL of water and stirred overnight. The resulting slurry was filtered and the solid dried to afford 0.645 g (65%) of 3-phthalimido-3-(4-benzyloxy-3-methoxyphenyl)propionamide as a white powder: 1H NMR (DMSO-d6) δ 7.84 (m, 4 H, Ar), 7.60-7.25 (m, 5 H), 7.53 (br s, 1 H, CONH), 7.15-6.8 (m, 4 H), 5.67 (t, 1 H, J=7.8 Hz), 5.04 (s, 2 H, OCH2), 3.75 (s, 3 H, OMe), 3.19 (d, 2 H, J=9, 16.5 Hz); 13C NMR (DMSO-d6) δ 171.1, 167.6,148.8, 147.2, 137.0, 134.5, 132.0, 131.2, 128.3, 127.7, 127.6, 123.0, 119.3, 113.2, 111.4, 69.8, 55.5, 50.3, 36.9. Anal. Calcd for C25H22N2O5. Theory: C, 69.76; H, 5.15; N, 6.51. Found: C, 69.54; H, 5.13; N, 6.28.

Provenance & Evidence