4-tert-Butylcyclohexanone → 4-tert-butyl-1,1-difluorocyclohexane

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Reaction Steps

A solution of 4-t-butylcyclohexanone (308 mg, 2.0 mmol) in CH2Cl2 (10.0 mL) was added to N-ethyl-N-phenylaminosulfur trifluoride (627 mg, 3.0 mmol ) at room temperature under N2. BF3.OEt2 (100 mL) was added and the mixture was stirred for 6 h at room temperature. The mixture was washed with saturated NaHCO3, dried (Na2SO4), filtered and evaporated in vacuo. Proton and Fluorine NMR with 4-fluoroanisole (2 mmol) as internal standard showed that a 99% yield of 1,1-difluoro-4-t-butylcyclohexane was obtained.

Provenance & Evidence