反应详情

温度

12.5 °C

To a solution of biotin in anhydrous dimethylformamide is added 1.1 equivalents of N-methylglycine methyl ester and 3 equivalents of triethylamine followed by the addition of 1.05 equivalents of BOP (benzotriazol-1-yloxy-tris (dimethylamine)phosphonium hexafluorophosphate). The mixture is stirred at 0-25° C. for 2-24 h and then concentrated. The residue is diluted with ethyl acetate and the resulting solution is washed with 1 N aqueous hydrochloric acid and then with saturated aqueous sodium bicarbonate. The organic phase is dried over magnesium sulfate, filtered and then concentrated via reduced pressure rotary evaporation. The residue is chromatographed on silica gel, eluting with 5-15% methanol/ethyl acetate. Chromatographic fractions containing product are combined and concentrated to afford the final product (4).

1. concentrationconcentrated
2. additionThe residue is diluted with ethyl acetate
3. washthe resulting solution is washed with 1 N aqueous hydrochloric acid
4. dry with materialThe organic phase is dried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated via reduced pressure rotary evaporation
7. customThe residue is chromatographed on silica gel
8. washeluting with 5-15% methanol/ethyl acetate
9. additionChromatographic fractions containing product
10. concentrationconcentrated