How is 2-(3,4-Dimethoxyphenyl)-5,7-dimethoxy-4H-chromen-4-one (CAS: 855-97-0) typically synthesized?

2-(3,4-Dimethoxyphenyl)-5,7-dimethoxy-4H-chromen-4-one (CAS: 855-97-0) can be synthesized via a multistep process involving the protection of phenol groups, followed by a Diels-Alder reaction. Commonly, this involves treating 2,3,4-trimethoxybenzaldehyde with a chromenone derivative under anhydrous conditions, using a catalytic amount of a Lewis acid like aluminum chloride. The reaction is typically carried out in a chlorinated solvent such as dichloromethane, yielding the target compound with good to excellent selectivity and up to 90% yield.