反应详情

温度

110 °C

2-(3,4-Dichloro-phenyl)-3-[2-(tetrahydro-pyran-2-yloxy)-cyclopentyl]-propionic acid methyl ester (400 mg, 0.99 mmol) and methylurea (110.7 mg, 1.49 mmol) in a solution of magnesium methoxide in methanol (7.4 wt. % , 2.85 mL, 1.99 mmol) was heated under reflux at 110° C. for 6 h. The reaction mixture was then concentrated in vacuo and filtered through a plug of celite (ethyl acetate as eluent). Flash chromatography (Merck Silica gel 60, 230-400 mesh, 100% ethyl acetate) afforded 1-{2-(3,4-dichloro-phenyl)-3-[2-(tetrahydro-pyran-2-yloxy)-cyclopentyl]-propionyl}-3-methyl-urea (52 mg, 11.8%) as a white solid: mp 68-70° C.; FAB-HRMS m/e calcd for C21H28Cl2N2O4 (M+H)+ 443.1504. found 443.1499.

1. concentrationThe reaction mixture was then concentrated in vacuo
2. filtrationfiltered through a plug of celite (ethyl acetate as eluent)