反应详情

A solution of 0.50 g (1.26 mmol) of 2-adamantyloxycarbonyl-α-methyl-DL-tryptophan and 0.19 g (1.41 mmol) of 1-hydroxybenzotriazole hydrate in 20 mL of anhydrous EtOAc (under a N2 atmosphere) was treated in one portion with 0.34 g (1.65 mmol) of 1,3-dicyclohexylcarbodiimide. The mixture was stirred at room temperature for 2 hours, treated with 0.26 g (1.62 mmol) of tryptamine, and stirred for an additional 18 hours. The precipitated solid was filtered, washed with a small amount of fresh EtOAc, and discarded. The filtrate was diluted to 150 mL with EtOAc and washed with 5% aqueous citric acid (3×150 mL), brine (1×150 mL), 5% aqueous NaHCO3 (3×150 mL), and brine again. The organic layer was dried (Na2SO4) and evaporated (vacuum) to a tan solid. The residue was chromatographed (E. Merck prepacked Lobar column, 37×440 mm, eluted with 2% MeOH in CH2Cl2) to yield the purified product as a white foam, 0.32 g (47%); 1H NMR (CDCl3) δ1.46-1.92 (17H, m), 2.83 (2H, t, J 7 Hz), 3.23 (1H, d, J 15 Hz), 3.40 (1H, d, J 15 Hz), 3.52 (2H, m), 4.78 (1H, br s), 5.23 (1H, br s), 6.12 (1H, m), 6.77 (1H, m), 6.82 (1H, m), 7.06-7.58 (8H, m), 7.96 (2H, br s).

1. stirringstirred for an additional 18 hours
2. filtrationThe precipitated solid was filtered
3. washwashed with a small amount of fresh EtOAc
4. additionThe filtrate was diluted to 150 mL with EtOAc
5. washwashed with 5% aqueous citric acid (3×150 mL), brine (1×150 mL), 5% aqueous NaHCO3 (3×150 mL), and brine again
6. dry with materialThe organic layer was dried (Na2SO4)
7. customevaporated (vacuum) to a tan solid
8. customThe residue was chromatographed
9. wash(E. Merck prepacked Lobar column, 37×440 mm, eluted with 2% MeOH in CH2Cl2)