DL-beta-Phenylalanine → HCID 15435489, compound

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Reaction Steps

A stirred mixture 3-amino-3-phenylpropionic acid and cis-1,2-cyclohexanedicar-boxylic anhydride in 10 mL of acetic acid under nitrogen was heated to reflux for 4 h and then allowed to cool to room temperature. The resulting mixture was concentrated to an orange yellow oil. This oil was crystallized from a 1/1 mixture of ethyl acetatethexane to afford 1.77 g (58%) of 3-(cis-hexahydrophthalimido)-3-phenylpropionic acid as white crystals: 1H NMR (DMSO-d6) δ12.45 (br s, 1H, COOH), 7.33 (m, 5H, Ph), 5.48 (dd, 1H, J=6.3, 9.6, CH), 3.41 (dd, 1H, J=16.5, 9.6 Hz), 3.14 (dd, 1H, J=16.5, 6.3 Hz), 2.50 (m, 2H), 1.8-1.1 (m, 8 H); 13C NMR (DMSO-d6) δ179.3, 179.2, 171.7, 138.7, 128.4, 127.5, 126.8, 50.1, 38.7, 38.6, 35.2, 23.0, 22.9, 21.1. Anal. Calcd for C17H19NO4. Theory: C, 67.76; H, 6.36; N, 4.65. Found: C, 67.52; H, 6.20; N, 4.60.

Provenance & Evidence