3-iodo-7-isopropoxy-5,6-dimethoxy-4H-chromen-4-one 3. An important feature of this synthetic scheme involves selective alkylation, which can be achieved by two different routes. One route involves the selective isopropylation of a triacetate derivative 4 underbasicconditions. The second route employs the selective demethylation of a trimethoxy derivative5under acidic conditions followed by isopropylation. The product