Diethyl Ether → 2-(2-Chlorocyclohex-2-en-1-yl)-1H-isoindole-1,3(2H)-dione

Participants

Reaction Steps

A solution of 11.0 g (72.8 mmol) 1,6-dichlorocyclohexene, 20.0 g (108 mmol) potassium phthalimide and 1.0 g (6.0 mmol) potassium iodide in 50 ml dry dimethylformamide was stirred 24 hours at 110° C. under an atmosphere of nitrogen. The reaction mixture was allowed to cool then poured into 30 ml diethyl ether. The dark mixture was filtered then ether and DMF removed in vacuo. The dark crystalline residue was dissolved in ethyl acetate then chromatographed on 500 g flash silica eluting with 10% to 20% ethyl acetate/hexane. Concentration of appropriate fractions followed by recrystallization from ethyl acetate/hexane gave 14.0 g (73.5%) of the desired phthalimide, mp 99°-103° C.

Provenance & Evidence