Potassium → HCID 19966028, compound

Participants

Reaction Steps

454 mg (4.06 mmol) of potassium-t-butoxide were added to 10 ml of a tetrahydrofuran solution containing 1.00 g (4.16 mmol) of ethyl 5-cycloheptyl-3-oxovalerate (prepared as described in Preparation 5). The mixture was then stirred for 10 minutes to prepare the corresponding potassium salt. 1.11 g (3.47 mmol) of 2-t-butyl-5-iodomethyl-1-nitrobenzene (prepared as described in Preparation 51) were added to the mixture in an ice bath, and the mixture was stirred for 2 hours at the temperature of the ice bath. The reaction solution was diluted with diethyl ether and washed with water. The solvent was removed by distillation under reduced pressure, and the resulting residue was dissolved in 10 ml of ethanol. 1.73 ml of a 2N aqueous solution of sodium hydroxide were added, and the mixture was heated for 4 hours under reflux. The reaction mixture was then cooled in an ice bath, sufficient concentrated aqueous hydrochloric acid was added to adjust its pH to a value of 5.0, and the mixture was heated for a further 2 hours under reflux. At the end of this time, the reaction solution was diluted with diethyl ether and washed with water. The solvent was then removed by distillation under reduced pressure. The resulting residue was subjected to column chromatography through 70 g of silica gel. Elution with a 2:1 by volume mixture of methylene chloride and hexane afforded 850 mg (yield 68%) of the title compound as an oily substance.

Provenance & Evidence