反应详情

A solution of N-methylmorpholine (0.217 ml) and isobutyl chloroformate (0.256 ml) in tetrahydrofuran (5 ml) is added to a solution of (2R)-2-(tert-butoxycarbonylamino)-3-(4-methylbenzylthio)propionic acid (reference compound No. 3-1, 700 mg) in tetrahydrofuran (15 ml) under a nitrogen atmosphere and freezing medium (ice-sodium chloride) cooling, and the mixture is stirred for 15 minutes. Then, a 40% aqueous N-methylamlne solution (0.756 ml) is added thereto under a freezing medium (ice-sodium chloride) cooling, and the mixture is further stirred for two hours. A 5% aqueous sodium hydrogencarbonate solution is added to the system of reaction, and the whole is extracted with ethyl acetate. The organic layer is washed with a saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The obtained residue is purified by silica gel column chromatography to give the titled compound.

1. stirringthe mixture is further stirred for two hours
2. extractionthe whole is extracted with ethyl acetate
3. washThe organic layer is washed with a saturated sodium chloride solution
4. dry with materialdried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe obtained residue is purified by silica gel column chromatography