反应详情

An oven-dried 20 mL vial equipped with septum and stir bar was charged with 6 mL dioxane, Gly—Gly (1.325 g, 10.0 mmol), BOC—ON (2.714 g, 11.0 mmol), and Et3N (2.10 mL, 15 mmol). The mixture was stirred for 2 hours during which time a clear yellow solution formed. The mixture was extracted with EtOAc (20 mL) and H2O (15 mL). The aqueous layer was collected, washed with EtOAc and added to 50 mL 5% citric acid. The t-BOC-GlyGlyOH was extracted with EtOAc (200 ml) and dried over anhydrous Na2SO4. The EtOAc was removed in vacuo and triturated with hot Et2O. White crystals were collected, washed with Et2O and dried to give 1.309 g of the title compound: 1H NMR (300 MHz, DMSO-d6): δ 12.3 (bs 1H, CO2H), 8.04 (t, 1, NH), 6.98 (t, 1H, NH), 3.75 (d, 2H, CH2), 3.56 (d, 2H, CH2), and 1.38 (s, 9H, C(CH3)3).

1. customAn oven-dried 20 mL vial equipped with septum
2. stirringThe mixture was stirred for 2 hours during which time a clear yellow solution
3. customformed
4. extractionThe mixture was extracted with EtOAc (20 mL) and H2O (15 mL)
5. customThe aqueous layer was collected
6. washwashed with EtOAc
7. additionadded to 50 mL 5% citric acid
8. extractionThe t-BOC-GlyGlyOH was extracted with EtOAc (200 ml)
9. dry with materialdried over anhydrous Na2SO4
10. customThe EtOAc was removed in vacuo
11. customtriturated with hot Et2O
12. customWhite crystals were collected
13. washwashed with Et2O
14. customdried