1-[2-(4-Amino-3-chloro-benzoylamino)-propionyl]-pyrrolidine-2-carboxylic acid → 1-[2-(4-Amino-3-chloro-benzoylamino)-propionyl]-pyrrolidine-2-carboxylic acid (2-ethoxy-5-oxo-tetrahydro-furan-3-yl)-amide

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Reaction Steps

Prepared from (2-ethoxy-5-oxo-tetrahydro-furan-3-yl)-carbamic acid allyl ester and 97a following the method used for 98a. The title compound was isolated as a white solid (175 mg, 77% yield). 1H-NMR (500 MHz, CD3OD) δ 1.13 (t, 0.5H), 1.23 (t, 2.5H), 1.36 (d, 0.5H), 1.44 (d, 2.5H), 1.75-2.38 (m, 4H), 2.56 (dd, 1H), 2.76 (dd, 1H), 3.45-3.97 (m, 5H), 4.47 (dd, 1H), 4.59-4.67 (m, 1H), 4.74 (q, 1H), 5.55 (d, 0.2H), 5.56 (d, 0.8H), 6.75-6.82 (m, 1H), 7.56 (dd, 1H), 7.77 (d, 1H), 8.39 (d, 1H). Analytical HPLC 8.17 min. LC-MS (ES+) m/e=467.4 (MH+).

Provenance & Evidence