反应详情

trans-4-Hydroxy-L-proline (5.00 g, 38.2 mmol) and NaHCO3 (8.00 g, 95.2 mmol) were suspended in 150 ml H2O/Dioxane (1:1). Fluorenylmethyl chloroformate (11.4 g, 44.0 mmol) in 25 ml toluene was added dropwise. The temperature of the reaction was not allowed to rise above 25° C. during the addition. The mixture was stirred vigorously overnight, and then quenched with 50 ml saturated NaHCO3 solution and 50 ml water. The solution was then extracted with 100 ml diethyl ether. The aqueous layer was acidified to pH 1 with concentrated HCl, and extracted twice with ethyl acetate, and the organic extracts washed with brine. The solution was dried with MgSO4, filtered and the solvent removed in vacuo. The pure product crystallized from the concentrated solution. Yield: 13.4 g (100%). 1H NMR: (CDCl3, 200 MHz) δ 7.75-7.15 (8H, m, ArH), 4.55-4.05 (5H, m, ArCHCH2, H2, H4), 3.65-3.45 (2H, m, 2 H5), 2.35-2.10 (2H, m, 2 H3).

1. additionto rise above 25° C. during the addition
2. customquenched with 50 ml saturated NaHCO3 solution and 50 ml water
3. extractionThe solution was then extracted with 100 ml diethyl ether
4. extractionextracted twice with ethyl acetate
5. washthe organic extracts washed with brine
6. dry with materialThe solution was dried with MgSO4
7. filtrationfiltered
8. customthe solvent removed in vacuo
9. customThe pure product crystallized from the concentrated solution