1,2-Dichloroethane → 1-[2-(4-Methoxy-benzoylamino)-2-methyl-propionyl]-pyrrolidine-2-carboxylic acid (2-benzyloxy-5-oxo-tetrahydro-furan-3-yl)-amide

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반응 단계

To a solution of (2-benzyloxy-5-oxo-tetrahydrofuran-3-yl)-carbamic acid allyl ester (40) (1.027 g, 3.5 mmol) in CH2Cl2 (20 ml) was added DMBA (543 mg, 3.48 mmol) and Pd(PPh3)4 (280 mg, 0.24 mmol) and the solution was stirred at room temperature under N2 for 20 minutes. A solution of 1-[2-(4-methoxy-benzoylamino)-2-methyl-propionyl]-pyrrolidine-2-carboxylic acid (818 mg, 2.45 mmol) in CH2Cl2 (5 ml) was added, followed by HOBT (0.534 g, 3.95 mmol) and EDC (738 mg, 3.84 mmol). The reaction was stirred at room temperature for 18 hours under N2. The solvent was evaporated, the crude material dissolved in EtOAc and washed with 0.5N NaHSO4 (2×), saturated NaHCO3 (2×) and brine and was dried over anhydrous Na2SO4, filtered and evaporated to give a yellow solid. Purification by flash column chromatography, eluting with ethyl acetate/hexanes (20/80 to 50/50%), gave the product as pale yellow solid (760 mg, 61% yield). 1H-NMR (500 MHz, CD3OD) δ 1.53 (d, 6H), 1.65-1.93 (m, 3H), 1.96-2.14 (m, 1H), 2.60 (dd, 0.1H), 2.77 (dd, 0.85H), 2.94 (dd, 0.85H), 3.04-3.11 (m, 0.2H), 3.42-3.52 (m, 1H), 3.57-3.67 (m, 1H), 3.84 (s, 3H), 4.38-4.76 (m, 3H), 4.84 (d, 1H), 5.64-5.70 (m, 1H), 6.96-7.03 (m, 2H), 7.23-7.43 (m, 5H), 7.78-7.97 (m, 2H). Analytical HPLC (C18 column) 13.32, 14.37 min. LC-MS (ES+) m/e=524.3 (M+H).

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