4-Methylmorpholine → Cbz-Dap(Boc)-Ala-OBn

Participants

Reaction Steps

Cbz-Dap(Boc)-OH (0.41 g, 1.2 mmol) was treated with a mixture of 1-(3-(dimethylamino)propyl)-3-ethylcarbodiimide methiodide (0.374 g, 1.26 mmol) and N-hydroxybenzotriazole (0.17 g, 1.26 mmol) in N-methylmorpholine (0.28 mL, 2.1 mmol) in dichloromethane. H-Ala-OBn (0.26 g, 1.2 mmol) was added to the above solution and the resulting mixture was stirred for 14 h at room temperature, then diluted with ethyl acetate (40 mL). The organic solution was washed with 10% aqueous citric acid solution (2×30 mL), saturated aqueous sodium bicarbonate solution (2×30 mL) and brine (2×30 mL). The organic layer was dried over magnesium sulfate and then concentrated in vacuo. The crude compound (247) (0.51 g) was used without further purification.

Provenance & Evidence