反应详情

In tetrahydrofuran (300 ml) was dissolved 23.86 g (200 mmol) of 1,1-dimethyl-2-(methylthio)ethylamine, and 103.4 g (200 mmol) of a 30% solution of carbobenzoxy chloride in toluene and then a solution of 24.29 g (240 mmol) of triethylamine in tetrahydrofuran were slowly dropped thereinto under ice-cooling. After the resulting mixture was stirred at room temperature for 3 hours, the triethylamine hydrochloride precipitated was filtered under reduced pressure and washed with ethyl acetate. The filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography (hexane:ethyl acetate=4:1) to obtain 36.35 g (yield 72%) of benzyl 1,1-dimethyl-2-(methylthio)ethylcarbamate.

1. temperatureunder ice-cooling
2. customthe triethylamine hydrochloride precipitated
3. filtrationwas filtered under reduced pressure
4. washwashed with ethyl acetate
5. concentrationThe filtrate was concentrated under reduced pressure
6. customthe residue was purified by silica gel column chromatography (hexane:ethyl acetate=4:1)