1: 4-methoxy-6-vinyl-2H-pyran-2-one With sodium acetate; palladium diacetate in acetonitrile Heck-Matsuda reaction; 0.166667 h; 2: 3,4-(methylenedioxy)benzenediazonium tetrafluoroborate in acetonitrile Heck-Matsuda reaction;

magnesium methanolate in methanol 7 h; Heating;

1: potassium carbonate / acetone / Inert atmosphere; Reflux 2: selenium(IV) oxide / 1,4-dioxane / 5 h / 180 °C / Inert atmosphere; Sealed tube 3: n-butyllithium; triphenyl-methyl-phosphonium iodide / tetrahydrofuran / 3 h / -78 - 20 °C / Inert atmosphere 4: sodium acetate; palladium diacetate / acetonitrile / 0.17 h View Scheme

1: selenium(IV) oxide / 1,4-dioxane / 5 h / 180 °C / Inert atmosphere; Sealed tube 2: n-butyllithium; triphenyl-methyl-phosphonium iodide / tetrahydrofuran / 3 h / -78 - 20 °C / Inert atmosphere 3: sodium acetate; palladium diacetate / acetonitrile / 0.17 h View Scheme

1: sulfuric acid / 0.25 h / 130 °C / Cooling with ice 2: potassium carbonate / acetone / Inert atmosphere; Reflux 3: selenium(IV) oxide / 1,4-dioxane / 5 h / 180 °C / Inert atmosphere; Sealed tube 4: n-butyllithium; triphenyl-methyl-phosphonium iodide / tetrahydrofuran / 3 h / -78 - 20 °C / Inert atmosphere 5: sodium acetate; palladium diacetate / acetonitrile / 0.17 h View Scheme