反应详情

To 50 ml of tetrahydrofuran was added 4-fluorobenzoic acid (3.64 g, 26 mmol), L-serine methyl ester hydrochloride (2 g, 13 mmol), 1-hydroxybenzotriazole hydrate (4 g, 26 mmol), O-benzotriazol-1-yl-N,N,N′,N′-tetramethyluronium hexafluorophosphate (9.9 g, 26 mmol), triethylamine (3.5 ml, 26 mmol) and dimethylaminopyridine (20 mg, 0.16 mmol). The reaction was stirred for 24 hours at room temperature. Solvent was removed under reduced pressure, and the residue dissolved in 150 ml of ethyl acetate. The organic solution was washed in a separatory funnel in the following manner: 3×100 ml 10% aqueous citric acid, 3×100 ml saturated sodium bicarbonate, 3×100 ml water, 1×75 ml saturate sodium chloride solution. The organic layer was concentrated and purified using a Flash40 column (1:2 EtOAc:Hexane, 20 psi) to yield 3 grams of methyl 2-[(4-fluorophenyl)carbonylamino]-3-hydroxypropanoate.

1. customSolvent was removed under reduced pressure
2. dissolutionthe residue dissolved in 150 ml of ethyl acetate
3. washThe organic solution was washed in a separatory funnel in the following manner
4. concentration3×100 ml 10% aqueous citric acid, 3×100 ml saturated sodium bicarbonate, 3×100 ml water, 1×75 ml saturate sodium chloride solution
5. concentrationThe organic layer was concentrated
6. custompurified