Triethylamine → HCID 86699922, compound

Participants

Reaction Conditions

Reaction Steps

In a round bottomed flask equipped with a magnetic stirrer and a dropping funnel (2S,3R)-3-hydroxy-2-[(1-methylcyclohexoxy)carbonylamino]-butanoic acid (0.503 g, 1.95 mmol) was dissolved in anhydrous CH2Cl2 (50 mL). The clear yellow solution was cooled to 0° C., PyBOP (1.22 g, 2.34 mmol) was added, followed by a dropwise addition of Et3N solution (0.815 mL, 5.85 mmol) in anhydrous CH2Cl2 (5 mL), over a period of 10 min. The crude mixture was stirred at 0° C. for 1 h then overnight at rt. The reaction was quenched by addition of 5% NaHCO3 solution (50 mL) and the corresponding mixture was vigorously stirred for 10 min. The two phases were separated and the organic one collected, dried over Na2SO4 and concentrated to dryness to leave an oil, which was purified by typical chromatography eluting with petroleum ether/AcOEt mixtures (from 9:1 to 7:3). The title compound was obtained as white solid (0.070 g, 15%). m.p.: 92-93° C. MS (ESI) m/z: 242.2 [M−H]+; (ESI) m/z: 240.1 [M−H]−. 1H NMR (DMSO-d6): δ 1.15-1.60 (m, 8H) 1.35 (d, J=6.3 Hz, 3H), 1.42 (s, 3H), 2.02 (m, 2H), 4.83 (m, 1H), 5.35 (dd, J=9.2, 6.3 Hz, 1H), 7.98 (d, J=9.2 Hz, 1H).

Provenance & Evidence