56881-08-4Relevant articles and documents
An Improved Synthesis of 3-(1,1-Dimethylallyl)coumarins
Hernandez-Galan, Rosario,Salva, Javier,Massanet, Guillermo M.,Collado, Isidro G.
, p. 1701 - 1710 (2007/10/02)
The syntheses of several 3-(1,1-dimethylallyl)coumarins, simple or bearing additional furan or pyran rings is achieved starting from the corresponding C-3 unsubstituted derivatives.The key step involves Ireland-Claisen rearrangements of allyl esters.
Synthesis of 3-(1,1-Dimethylallyl)xanthyletin, 3-(1,1-Dimethylallyl)-8-(3,3-dimethylallyl)xanthyletin, Gravelliferone and dl-Chalepin
Sharma, R. B.,Kapil, R. S.
, p. 538 - 541 (2007/10/02)
The synthesis of title compounds has been achieved from the key intermediate 3-(1,1-dimethylallyl)-7-hydroxycoumarin (7) which, in turn, is obtained by triple Claisen rearrangement of 7-(3,3-dimethylallyl)oxycoumarin (2) using butyric anhydride as the trapping reagent.