4-Methylmorpholine → Boc-Asp(O-cHex) Man(4-MBzl)

To a cold solution of Boc-Asp(O-cHex), (31.5 g, 100 mmol) in THF (500 mL) and N-methylmorpholine (13.1 g, 120 mmol), isobutylchloroformate (15.6 mL, 1.2 mmol) was added dropwise. The reaction mixture was stirred for a few minutes and a solution of Man(4-MBzl) (22.0 g, 96 mmol) in THF (500 mL) was added. The reaction mixture was allowed to warm to room temperature and stirred for 18 h. Upon completion of the reaction, the reaction mixture was filtered and the filtrate was concentrated to dryness. The residue was dissolved in ethyl acetate (500 mL), and washed successively with 5% aqueous citric acid (3×150 mL), water (1×400 mL), 10% aqueous NaHCO3 (1×400 mL), water (1×400 mL) and saturated salt solution (1×300 mL). The solution was dried (anhydrous K2CO3), filtered and concentrated to yield the titled compound (53 g).

1. stirringstirred for 18 h
2. customUpon completion of the reaction
3. filtrationthe reaction mixture was filtered
4. concentrationthe filtrate was concentrated to dryness
5. dissolutionThe residue was dissolved in ethyl acetate (500 mL)
6. washwashed successively with 5% aqueous citric acid (3×150 mL), water (1×400 mL), 10% aqueous NaHCO3 (1×400 mL), water (1×400 mL) and saturated salt solution (1×300 mL)
7. dry with materialThe solution was dried (anhydrous K2CO3)
8. filtrationfiltered
9. concentrationconcentrated

ORD record

ord-926680f640c445d68e90af716e3fe069

Source dataset

uspto-grants-1997_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05643872