How is 2-(3,4-Dihydroxyphenyl)-3,5,7-trihydroxychromenium (CAS: 13306-05-3) typically synthesized?

2-(3,4-Dihydroxyphenyl)-3,5,7-trihydroxychromenium is commonly synthesized via a multistep process involving the protection of a chromone ring, followed by introduction of hydroxy groups at specific positions. The synthesis often utilizes acylation and reduction steps, with careful selection of catalysts to ensure high yield and selectivity. Common reagents include acetic anhydride for acylation and sodium borohydride for reductions.