反应详情

A solution of 2-(4-methanesulfonyl-phenyl)-3-(tetrahydro-pyran-2-yl)-propionic acid methyl ester (75 mg, 0.23 mmol), methylurea (34 mg, 0.46 mmol), and a solution of magnesium methoxide in methanol (7.4 wt. %, 0.49 mL, 0.35 mmol) and methanol (0.5 mL) was heated at 100° C. for 8 h. Over time, the reaction mixture turned cloudy in appearance. At this time, the reaction was concentrated in vacuo. The residue was dissolved in ethyl acetate (10 mL) and then filtered through a pad of silica gel. The filtrate was concentrated in vacuo. Biotage chromatography (FLASH 12M, Silica, 30/70 hexanes/ethyl acetate) afforded 1-[2-(4-methanesulfonyl-phenyl)-3-(tetrahydro-pyran-2-yl)-propionyl]-3-methyl-urea (5 mg, 6%) as a colorless oil: FAB-HRMS m/e calcd for C17H24N2O5S (M+H)+ 369.1484, found 369.1495.

1. concentrationAt this time, the reaction was concentrated in vacuo
2. dissolutionThe residue was dissolved in ethyl acetate (10 mL)
3. filtrationfiltered through a pad of silica gel
4. concentrationThe filtrate was concentrated in vacuo