Triethylamine → HCID 66926177, compound

Participants

Reaction Steps

5-[hydroxy-(tetrahydro-pyran-4-yl)-methyl]-3-methoxy-cyclopent-2-enone (1.1 g, 5 mmol) was dissolved in dichloromethane (25 ml) in a 50 ml round bottom flask fitted with a reflux condenser. Triethylamine (1.4 ml, 10 mmol) and then methane sulfonyl chloride (0.8 ml, 10 mmol) was added dropwise which caused the reaction to warm to reflux. After 10 minutes the reaction was quenched by the addition of 1 M hydrochloric acid (10 ml). The layers were separated and the organics collected, passed through a phase separation cartridge and the solvent removed in vacuo. The crude product was dissolved in methanol (25 ml) and anhydrous potassium carbonate (1.4 g, 10 mmol) added and the mixture was stirred at room temperature for 72 h. The solvent was then removed in vacuo and the residue dissolved in ethyl acetate (25 ml) and filtered to remove any solid. The filtrate was evaporated to dryness and the residue purified on by column chromatography (Hexane/EtOAc (7:3) to 100% EtOAc) to give 3-methoxy-5-[1-(tetrahydro-pyran-4-yl)-methylidene]-cyclopent-2-enone (938 mg).

Provenance & Evidence