反应详情

温度

80 °C

In a small pressure bottle was placed a mixture of 2-amino-3-(trans-3-methyl-cyclobutyl)-propionic acid methyl ester (147 mg, 0.86 mmol), acetonitrile (6 mL) and N,N-diisopropylethylamine (220 μL, 1.03 mmol) which was heated to 80° C. To this mixture was added (E)-4-bromo-3-(2-chloro-phenoxy)-but-2-enoic acid ethyl ester (prepared as in Example 61, 276 mg, 0.86 mmol) and the tube sealed and heated at 100° C. overnight. The mixture was cooled to room temperature and concentrated in vacuo with silica gel (2 g). Purification by Biotage flash chromatography (40S column, 16% ethyl acetate/hexanes to 40% ethyl acetate/hexanes) afforded 2-[4-(2-chloro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-3-(trans-3-methyl-cyclobutyl)-propionic acid methyl ester (108 mg, 35%) as an amber oil: HR-ES-MS m/z calculated for C19H22NO4Cl [M+H]+ 364.1310, observed 364.1310.

1. customthe tube sealed
2. temperatureheated at 100° C. overnight
3. temperatureThe mixture was cooled to room temperature
4. concentrationconcentrated in vacuo with silica gel (2 g)
5. customPurification by Biotage flash chromatography (40S column, 16% ethyl acetate/hexanes to 40% ethyl acetate/hexanes)