1-Bromopentane → 4-(4-Ethoxy-2,3-difluorophenyl)-1-pentylcyclohexanol

Participants

Reaction Steps

A solution of 54.5 ml of 1-bromopentane in 200 ml of THF was added dropwise to 10.7 g of magnesium turnings under a layer of 100 ml of THF, and the mixture was subsequently refluxed for 1 hour. A solution of 104.5 g of 4-(4-ethoxy-2,3-difluorophenyl)cyclohexanone (obtainable by lithiation of 4-ethoxy-2,3-difluorobenzene using n-butyllithium, reaction with 1,4-dioxaspiro[4.5]decan-8-one, dehydration and hydrogenation of the resultant alkene, followed by removal of the carbonyl protecting group under acidic conditions) in 500 ml of THF was then added dropwise at 40° C., and the mixture was refluxed for 2 hours. Conventional work-up gave 4-(4-ethoxy-2,3-difluorophenyl)-1-pentylcyclohexanol.

Provenance & Evidence