Efficient methods of synthesis of unsaturated alcohols and ketones by allylation of Favorsky reaction products under phase transfer conditions

Resumo

Allylation of the Favorsky reaction products with allyl halides under phase-transfer catalysis in the system CuI–K₂CO₃–Na₂SO₃–BTEAC–H₂O–C₆H₆ afforded the corresponding allylpropargyl alcohols in high yields (87–96%). The procedure is practical and scalable (more than 50 g of the target product can be prepared in a single run) and is characterized by high selectivity. Oxidation of secondary allylpropargyl alcohols with manganese dioxide in anhydrous acetonitrile at room temperature gave 75–81% of allylacetylenic ketones.