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

Participants

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 (195 mg, 82% yield). 1H-NMR (500 MHz, CD3OD) δ 1.32-1.55 (m, 3H), 1.58-1.77 (m, 3H), 1.98-2.54 (m, 4H), 2.68-2.76 (d, 0.3H), 2.79-2.89 (m, 0.7H), 2.96-3.10 (m, 0.7H), 3.18-3.27 (dd, 0.3H), 3.72-4.18 (m, 4H), 4.46-5.12 (m, 3H), 5.60 (s, 0.4H), 5.74-5.84 (m, 0.6H), 7.03 (d, 0.8H), 7.75-7.86 (m, 1H), 8.01 (d, 0.7H), 8.35 (d, 0.3H), 8.74 (d, 0.2H). Analytical HPLC 8.31 min. LC-MS (ES+) m/e=467.3 (MH+).

Provenance & Evidence