Acetic Anhydride → HCID 57733336, compound

Participants

Reaction Steps

A mixture of 2-[((S)-1-phenyl-propylcarbamoyl)-methyl]-benzoic acid (10 g), acetic anhydride (50 ml), and N,N-dimethylaminopyridine (100 mg) was heated at gentle reflux (Tmax=+124° C.) for 7 min and evaporated in vacuo at +50° C. to give the title compound as a yellow-brown solid (11.1 g, purity 98% by NMR). LC-MS (m/z) 322.3 (MH+); tR=1.72. 1H NMR (500 MHz, DMSO-d6): 0.89 (t, J=7.2 Hz, 3H), 1.86-1.97 (m, 2H), 2.56 (s, 3H), 4.95 (q, J=7.1 Hz, 1H, CH—NH), 7.26 (t, J=7.5 Hz, 1H), 7.29 (unres. m, 1H), 7.36-7.41 (unres m., 3H), 7.71 (t, J=7.5 Hz, 1H), 7.75 (d, J=8.3 Hz, 1H), 7.98 (d, J=7.8 Hz, 1H), 11.53 (d, J=7.6 Hz, 1H, NH). 13C APT NMR (125 MHz, DMSO-d6, δ(DMSO-d6)=39.87 ppm): 10.68 (CH3), 30.0 (CH2), 31.57 (CH3), 57.01 (CH), 92.44 (C), 114.88 (C), 124.2 (CH), (CH), 124.26 (CH), 126.65 (CH), 127.8 (CH), 129.05 (CH), 129.93 (CH), 135.71 (CH), 138.68 (C), 141.86 (C), 158.51 (C), 160.55 (C), 194.82 (C, MeCO).

Provenance & Evidence