反应详情

温度

50 °C

A solution of 1-(2-fluorophenyl)ethanone (20 g, 145 mmol) in tetrahydrofuran (250 ml) was treated under an inert atmosphere at room temperature with (R)-(+)-tert-butylsulfinamide (21.1 g, 174 mmol) followed by the addition of titanium(IV)ethoxide (66.1 g, 290 mmol). The solution was stirred at 50° C. for 15 hours. For the workup, the dark brown solution was cooled to room temperature, then poured into a saturated solution of ammonium chloride. After addition of ethyl acetate, the mixture was stirred vigorously for 15 minutes. After separation of the layers, the aqueous phase was extracted twice with ethyl acetate. The combined organic layers were washed twice with water, dried over sodium sulphate and evaporated at reduced pressure. Purification of the crude product by chromatography on silica gel using a 4:1-mixture of cyclohexane and ethyl acetate yielded the (R)-E-N(1-(2-fluorophenyl)ethylidene)-2-methylpropane-sulfinamide (25.9 g, 74% of theory) as a brown oil. MS (ISP): m/z=242.3 [M+H]+.

1. temperatureFor the workup, the dark brown solution was cooled to room temperature
2. stirringthe mixture was stirred vigorously for 15 minutes
3. customAfter separation of the layers
4. extractionthe aqueous phase was extracted twice with ethyl acetate
5. washThe combined organic layers were washed twice with water
6. dry with materialdried over sodium sulphate
7. customevaporated at reduced pressure
8. customPurification of the crude product by chromatography on silica gel using a 4