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Iso coumarins 4. synthesis of 5 6 di methoxy iso coumarins 6 7 di methoxy iso coumarins 7 8 di methoxy iso coumarins 5 7 di methoxy iso coumarins 5 8 di methoxy 3 methyl iso coumarins and a new synthesis of racemic 6 methoxy mellein



Iso coumarins 4. synthesis of 5 6 di methoxy iso coumarins 6 7 di methoxy iso coumarins 7 8 di methoxy iso coumarins 5 7 di methoxy iso coumarins 5 8 di methoxy 3 methyl iso coumarins and a new synthesis of racemic 6 methoxy mellein



Proceedings of the Indian Academy of Sciences Chemical Sciences 89(6): 525-532



o-Lithio 2,3-, 3,4-, 3,5-, 2,5- and 2,4-dimethoxy-N-methyl-benzamides upon condensation with propylene oxide give corresponding dimethoxy-3-methyl-3,4-dihydroisocoumarins. The method was used to synthesize (.+-.)-6-methoxy mellein. 3-Methyl-6,7-dimethoxy-3,4-dihydroisocoumarin was synthesized by an acid catalyzed cyclization reaction. The dihydroisocoumarins were dehydrogenated to respective isocoumarins.

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