反应详情

To a solution of morpholine (Aldrich, 1.27 mL, 14.6 mmol) and N,N-diisopropyl-N-ethylamine (DIPEA, Aldrich, 2.5 mL, 14.6 mmol) in acetonitrile (25 mL) at rt is added solid 2-benzyloxycarbonylamino-3-chlorosulfonylpropionic acid benzyl ester (3.0 g, 7.3 mmol), (prepared as described in Ross, D. L.; Skinner, C. G.; Shive, W. J. Org. Chem. 1959, 24, 1372-1374; and b) Byrnes, S.; Burckart, G. J.; Mokotoff, M. J. Med. Chem. 1978, 21, 45-49], in small portions over 10 min. A clear colorless solution resulted from which white solid began to precipitate within minutes. After 10 min, a thick white suspension was formed. The reaction was diluted in CH2Cl2 to redissolve all solids and the solution washed with 1M HCl. The aqueous layer was separated and extracted with additional CH2Cl2. The organic layer was washed with brine and dried over anhydrous Na2SO4. Following concentration in vacuo, 3.35 g (99%) of 2(R)-benzyloxycarbonylamino-3-(morpholin-4-sulfonyl)propionic acid benzyl ester was obtained as a white solid.

1. customA clear colorless solution resulted from which white solid
2. customto precipitate within minutes
3. waitAfter 10 min
4. customa thick white suspension was formed
5. dissolutionto redissolve all solids
6. washthe solution washed with 1M HCl
7. customThe aqueous layer was separated
8. extractionextracted with additional CH2Cl2
9. washThe organic layer was washed with brine
10. dry with materialdried over anhydrous Na2SO4
11. concentrationconcentration in vacuo