反应详情

A round bottom flask equipped with magnetic stirrer, nitrogen inlet and additional funnel was charged with trimethylsulfoxonium iodide (1.1 g, 5.02 mmol), DMSO (10 ml) and powdered sodium hydroxide (0.175 g, 4.39 mmol). The suspension was stirred for 1.5 hours at ambient temperature to yield a solution. So prepared solution was added drop wise at ambient temperature to a solution of 4-(2,6-dichloro-phenyl)-but-3-en-2-one (0.90 g, 4.18 mmol) prepared as described in example P31 in DMSO (5 ml). The reaction mixture was stirred for 0.5 hours, poured onto ice and extracted with ether (3×25 ml). Combined organic layers were washed with water, brine and dried over anhydrous sodium sulfate. The solvent was removed in vacuo and the residue was purified by flash chromatography over silica gel (25 g) (eluent: n-hexane/ethyl acetate 20:1) to afford 0.30 g (31% of theory) of trans 1-[2-(2,6-dichloro-phenyl)-cyclopropyl]-ethyanone in form of a pale yellow liquid.

1. customA round bottom flask equipped with magnetic stirrer, nitrogen inlet and additional funnel
2. customto yield a solution
3. customSo prepared solution
4. customprepared
5. stirringThe reaction mixture was stirred for 0.5 hours
6. additionpoured onto ice
7. extractionextracted with ether (3×25 ml)
8. washCombined organic layers were washed with water, brine
9. dry with materialdried over anhydrous sodium sulfate
10. customThe solvent was removed in vacuo
11. customthe residue was purified by flash chromatography over silica gel (25 g) (eluent: n-hexane/ethyl acetate 20:1)
12. customto afford 0.30 g (31% of theory) of trans 1-[2-(2,6-dichloro-phenyl)-cyclopropyl]-ethyanone in form of a pale yellow liquid