O-Phenylenediamine → tert-butyl (2R,4R)-2-((2-aminophenyl)carbamoyl)-4-(3-(4-cyanophenyl)ureido)piperidine-1-carboxylate

Participants

Reaction Steps

Benzene-1,2-diamine (365 mg, 3.38 mmol) was added to a mixture of (2R,4R)-1-(tert-butoxycarbonyl)-4-(3-(4-cyanophenyl)ureido)piperidine-2-carboxylic acid (1400 mg, 3.60 mmol), BOP (1600 mg, 3.6 mmol) and DIEA (1.2 mL, 6.9 mmol) in DMF (20 mL), and the resulting solution was stirred at room temperature for 8 hours. Water (100 mL) was added to the reaction mixture and it was then extracted with ethyl acetate (2×200 mL). The organic layers were dried over MgSO4 and concentrated to give a red solid. Further purification by Companion (ReadySep, 80 g, silica gel packed) using ethyl acetate/heptane from 50-80% as eluent provided the title compound as a white solid 1600 mg (93%). LC-MS: 479.1, 477.2 (t=2.3 min).

Provenance & Evidence