反应详情

Under a nitrogen stream, (R)-3-methylisothiazolidine 1,1-dioxide (149 mg) described in Preparation Example 2 was dissolved in a solution of tetrahydrofuran (5 mL) and N,N-dimethylformamide (4 mL), sodium hydride (44 mg) was added under ice-cooling, and the mixture was stirred at the same temperature for 15 min. Then, a solution of methyl 4-bromomethylbenzoate (229 mg) in tetrahydrofuran (5 mL) was added, and the mixture was stirred under ice-cooling for 1.5 hr, and at room temperature for 2 hr. To the reaction mixture was added 0.5N hydrochloric acid, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and the solvent was evaporated. The obtained residue was purified by column chromatography (hexane:ethyl acetate) to give the title compound (159 mg).

1. additionwas added under ice-
2. temperaturecooling
3. stirringthe mixture was stirred under ice-
4. temperaturecooling for 1.5 hr
5. waitat room temperature for 2 hr
6. extractionthe mixture was extracted with ethyl acetate
7. washThe organic layer was washed with water and saturated brine
8. customthe solvent was evaporated
9. customThe obtained residue was purified by column chromatography (hexane:ethyl acetate)