反应详情

N,N-dimethylformamide (9.00 mL) was added to a vial containing 4-(cyclobutyl(hydroxy)methyl)benzoic acid (370 mg, 1.79 mmol), ethyl 3-aminopropanoate hydrochloride (551 mg, 3.59 mmol) and O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (1.36 g, 3.59 mmol). Diisopropylethylamine (1.56 mL, 8.97 mmol) was then added. The reaction was stirred for 1.5 h, and was then concentrated. Purification by column chromatography (0-50% ethyl acetate in heptane) afforded ethyl 3-(4-(cyclobutyl(hydroxy)methyl)benzamido)propanoate (570 mg, 100% yield) as a white solid. 1H NMR (400 MHz, CDCl3) δ 7.73 (d, J=8.2 Hz, 2H), 7.38 (d, J=8.2 Hz, 2H), 4.63 (d, J=7.8 Hz, 1H), 4.17 (q, J=7.2 Hz, 2H), 3.72 (q, J=6.0 Hz, 2H), 2.64 (t, J=5.9 Hz, 2H), 2.61-2.54 (m, 1H), 2.08-1.95 (m, 2H), 1.88-1.75 (m, 4H), 1.27 (t, J=7.1 Hz, 3H). MS (M+1): 306.3.

1. concentrationwas then concentrated
2. customPurification by column chromatography (0-50% ethyl acetate in heptane)