反应详情

The product from Step 1 (0.67 g, 2.5 mmol) was dissolved in methylene chloride (10 mL) and Cbz-His(Trt)-OH (1.46 g, 2.75 mmol) was then added, followed by diisopropylethylamine (1.3 mL, 7.5 mmol), HATU (1.05 g, 2.76 mmol), HOAt (0.374 g, 2.75 mmol), and dimethylformamide (10 mL). The reaction was stirred overnight at room temperature. The solution was concentrated, the residue taken up in ethyl acetate and washed three times with saturated NaHCO3, brine, dried over MgSO4, filtered and concentrated in vacuo to give a white solid; 1.8 g (97% yield). MS-APCI: M+1=747.

1. concentrationThe solution was concentrated
2. washwashed three times with saturated NaHCO3, brine
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customto give a white solid