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Steps in the selective synthesis of 2,2′-((4-(3,7-bis(2-amino-2-oxoethoxy)-5-hydroxy-4-oxo-4H-chromen-2-yl)-1,2-phenylene)bis(oxy))diacetamide or quercetin tetra acetamide (4), ethyl 2-((3,7-bis(2-amino-2-oxoethoxy)-2-(3,4-bis(2-amino-2-oxoethoxy)phenyl)-4-oxo-4H-chromen-5-yl)oxy)acetate (5) and 2,2′,2″-((2-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-4-oxo-4H-chromene-3,5,7-triyl)tris(oxy))triacetamide (7) derivatives.
