反应详情

A solution of [4-(4-benzyloxycarbonylaminobutyl)phenoxy]acetic acid ethyl ester 23 (0.3 g, 0.78 mmol), 2-(2-hydroxyethylamino)ethanol 24 (0.15 mL, 1.6 mmol), and ethanol (20 mL) was heated at 70° C. for 72 hours. Solvent was evaporated in vacuo. The residue was purified by flash chromatography (silica gel, dichloromethane/methanol, 100:5, v/v) to provide [4-(4-{[N,N-bis-(2-hydroxyethyl)carbamoyl]methoxy}phenyl)-butyl]carbamic acid benzyl ester 25 [0.19 g, 100% based on the recovered starting material (0.13 g)] as a pale yellow solid. 1H NMR (300 MHz, CD3OD) δ 1.65 (m, 4H), 2.50 (m, 2H), 3.20 (m, 2H), 3.55 (m, 4H), 3.75 (m, 4H), 4.80 (s, 2H), 5.10 (s, 2H), 6.85 (d, 2H), 7.10 (d, 2H), 7.40 (m, 5H). m/z (ESI): 445 [C24H32N2O6+H]+.

1. customSolvent was evaporated in vacuo
2. customThe residue was purified by flash chromatography (silica gel, dichloromethane/methanol, 100:5