aluminum oxide; sodium tetrahydroborate in methanol 0.0333333 h; microwave irradiation;

1: Methyltriphenylphosphonium bromide With phenyllithium; lithium bromide in tetrahydrofuran; anhydrous butyl ether T=-78 - 20°C; 0.166667 h; Inert atmosphere; 2: With phenyllithium in tetrahydrofuran; anhydrous butyl ether T=-78 - 20°C; 0.5 h; Inert atmosphere; 3: 3,4-dimethoxy-benzaldehyde; acetaldehyde regioselective reaction; Further stages;

1: 1.28 g / aq. NaOH / 0.5 h / Ambient temperature 2: NaBH4 / methanol / Ambient temperature View Scheme