反应详情

Prepared from 1-[2-(4-methoxy-3,5-dimethyl-benzoylamino)-propionyl]-pyrrolidine-2-carboxylic acid tert-butyl ester and syn-(2-ethoxy-5-oxo-tetrahydro-furan-3-yl)-carbamic acid allyl ester according to the procedure used to prepare 98a to afford 174 mg (81% yield) of the title compound. 1H-NMR (500 MHz, CDCl3) δ 1.04 (t, 0.45H), 1.27 (t, 2.55H), 1.34-1.45 (m, 3H), 1.95-2.45 (m, 10H), 2.78-2.84 (m, H), 3.60-3.90 (m, 8H), 4.50-4.70 (m, 2H), 4.90-4.94 (m, H), 5.45 (d, 0.85H), 5.61 (d, 0.15H), 6.99 (d, H), 7.15 (d, H), 7.45 (s, 2H); retention time on analytical HPLC: 10.09 min; LC-MS: m/z=476 (M+H+).