O-Phenylenediamine → HCID 22478729, compound

Participants

Reaction Steps

A mixture of acid 456c (729 mg; 2.54 mmol), 1,2-phenylenediamine (376 mg; 3.47 mmol; 1.36 eq) and BOP (1.43 g; 3.23 mmol; 1.27 eq) was dissolved in acetonitrile (15 mL), treated with triethylamine (3 mL) and stirred overnight. The reaction mixture was quenched with methanol, concentrated and purified by chromatographic column on silica gel (40% EtOAc in DCM) and the obtained material crystallized from DCM to give 358 mg (0.88 mmol; 35% yield) of pure compound 456. 1H-NMR (300 MHz; DMSO-d6) δ (ppm): 9.57 (s, 1H), 7.92 (d, J=7.9 Hz, 2H), 7.66 (d, J=4.8 Hz, 1H), 7.48 (d, J=8.3 Hz, 2H), 7.26 (d, J=8.3 Hz, 1H), 7.15 (d, J=7.9 Hz, 1H), 6.95 (t, J=7.5 Hz, 1H), 6.76 4.87 (bs, 2H), 6.58 (t, J=7.5 Hz, 1H), 6.54 (d, J=1.8 Hz, 1H), 6.13 (dd, J=1.8, 8.3 Hz, 1H), 6.27 (t, J=5.7 Hz, 1H), 4.87 (bs, 2H), 4.36 (d, J=5.7 Hz, 2H), 2.85 (d, J=4.8 Hz, 3H). LRMS: calc: 403.5008. found: 404.2 (M+NH) and 202.6 (M+2H)/2.

Provenance & Evidence