Water → 548-42-5

Participants

Reaction Conditions

Reaction Steps

800 mg of 2-bromo-1-(tert-butyldimethylsilyl)-8,9-didehydro-6,8-dimethylergoline was dissolved in 50 ml of anhydrous toluene; the solvent was distilled off under vacuum and the mixture taken up in 75 ml of anhydrous, freshly distilled toluene under an argon atmosphere. To this solution was added 1 ml of anhydrous tetramethylethylenediamine and the mixture was cooled to -90° C. Then the mixture was combined with 6.0 ml of 1.4-molar tert-butyllithium solution in hexane (8.4 mmol) and agitated for 5 hours. Water was then added, the mixture was extracted with methylene chloride, the organic phase was dried with sodium sulfate and evaporated. In a quantitative yield, 8,9-didehydro-6,8-dimethylergoline was isolated. The desired 8,9-didehydro-6,8-dimethyl-2-trimethylsilylergoline could not be detected by NMR.

Provenance & Evidence