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

Participants

Reaction Steps

Prepared from 97a and syn-(2-isobutoxy-5-oxo-tetrahydro-furan-3-yl)-carbamic acid allyl ester according to the procedure used to prepare 98a to afford 93 mg (38% yield) of the title compound. 1H-NMR (500 MHz, CDCl3): δ 0.74-0.76 (t, 0.6H), 0.80-1.00 (m, 5.4H), 1.40-1.50 (m, 3H), 1.90-2.22 (m, 3H), 2.33-2.45 (m, H), 2.80-2.90 (m, H), 3.32-3.38 (m, H), 3.55-3.80 (m, 3H), 4.38 (br, H), 4.50-4.60 (m, H), 4.70-4.80 (m, H), 4.90-5.00 (m, H), 5.42-5.45 (m, H), 6.74-6.76 (d, H), 6.86-6.88 (d, H), 7.31-7.33 (d, H), 7.51-7.53 (m, H), 7.74-7.75 (d, H); retention time on analytical HPLC: 9.63 & 9.80 min; LC-MS: m/z=495 (M+H+).

Provenance & Evidence