反应详情

A stirred solution of (R)-4-(1-hydroxy-1-methyl-2-phenyl-ethyl)-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester (0.50 g) in THF (25 ml) was cooled under an argon atmosphere to −78° C. and treated dropwise with 1 M lithium-bis-(trimethylsilyl)amide in THF (1.79 ml). The solution was allowed to warm to r.t. Then, phenyl chlorothionoformate (0.3 ml) was added. After stirring at r.t. for 2 hrs, the reaction mixture was quenched with saturated aqueous NH4Cl solution and extracted with EtOAc. The organic layer was washed with brine, dried over MgSO4 and concentrated to give crude (R)-2,2-dimethyl-4-(1-methyl-1-phenoxythiocarbonyloxy-2-phenyl-ethyl)-oxazoli-dine-3-carboxylic acid tert-butyl ester as pale yellow oil which was used in the next reaction step without further purification.

1. customthe reaction mixture was quenched with saturated aqueous NH4Cl solution
2. extractionextracted with EtOAc
3. washThe organic layer was washed with brine
4. dry with materialdried over MgSO4
5. concentrationconcentrated