反应详情

A dry 100 mL round-bottomed flask equipped with a magnetic stir bar and a rubber septum was charged with 1-{[1-((2E)-3-phenylprop-2-enoyloxy)-2-methylpropoxy]carbonylamino}cyclopropanecarboxylic acid (18) (0.62 g, 1.8 mmols) and 10% palladium on carbon in a 1:1 mixture of ethylacetate and ethanol. The reaction was done at 1 atm pressure under a hydrogen balloon at ca. room temperature. After the reaction was complete, the solution was filtered through Celite and the solvents removed in vacuo using a rotary evaporator. The dry, crude residue was dissolved in a small amount of a mixture of 60% (v/v) acetonitrile/water (ca. 10 mL), and the solution filtered through a 0.2 μm nylon syringe filter. Final purification was achieved by mass-guided preparative HPLC. After lyophilization of the solvents, the title compound (19) was obtained as a yellow semisolid (70% yield). 1H NMR (CDCl3, 400 MHz): δ=7.33 (t, 2H), 7.20 (m, 3H), 6.61 (d, 1H), 6.05 (s, 0.35H), 5.35 (s, 0.65H), 2.98 (t, 2H), 2.71 (m, 2H), 2.01 (m, 1H), 1.65 (m, 2H), 1.36 (m, 2H), 0.98 (d, 6H). MS (ESI) m/z 371.92 (M+Na)+; 348.01 (M−H)−.

1. customA dry 100 mL round-bottomed flask equipped with a magnetic stir bar
2. customat ca. room temperature
3. filtrationthe solution was filtered through Celite
4. customthe solvents removed in vacuo
5. customa rotary evaporator
6. dissolutionThe dry, crude residue was dissolved in a small amount of a mixture of 60% (v/v) acetonitrile/water (ca. 10 mL)
7. filtrationthe solution filtered through a 0.2 μm nylon syringe
8. filtrationfilter
9. customFinal purification