Thioanisole → HCID 178506884, compound

Participants

Reaction Conditions

Reaction Steps

Phenylthiomethyl lithium was prepared by adding 120 ml of 2.5M butyl lithium in hexane to a solution of 37.3 g of thioanisole and 33.7 g of 1,4-diazabicyclo[2,2,2]octane in 400 ml of tetrahydrofuran dropwise with stirring at 0° C. and then allowing the mixture to react for 45 min at 0° C. and 1 hour at room temperature. A solution of 50.2 g of 1-(3-chloro-2-methoxymethoxyphenyl)-1-(2-methoxymethoxyphenyl)ethene dissolved in 100 ml of tetrahydrofuran was added slowly to this at ambient temperature with stirring. A brick red color developed. The mixture was heated to reflux for about 30 min. Analysis by gas-liquid chromatography indicated that the reaction was complete. The mixture was cooled, diluted with ether, and quenched with water. The solution was extracted several times with water and once with brine, dried over magnesium sulfate, filtered, and concentrated by evaporation under reduced pressure to obtain about 80 ml of a pale orange oil. This was subjected to a bulb-to-bulb distillation at up to 120° C. and 0.3 mm of mercury pressure. The thioanisole impurity was removed and a product cut of less than 5 ml was collected. Considerable decomposition took place. The product cut was partially purified by liquid chromatography, eluting with a 95:5 mixture of hexane and ether to obtain 1.8 g of the title compound of about 82 percent purity (gas-liquid chromatography) as a viscous oil. The proton NMR spectrum was consistent with the assigned structure.

Provenance & Evidence