Abstract
Reaction of
1,3,5-trihydroxyxanthone (6) with 3-methylbut-2-enyl bromide in the presence of
methanolic sodium methoxide yields a mixture of
2,4-di(3-methylbut-2-enyl)-5-(3-methylbut-2-enyloxy) derivative (7), natural
8-deoxygartanin (3) and the 2-(3-methylbut-2-eny1)-5-(3-methylbut-2-enyloxy) derivative (8). Cyclodehydrogenation of (3) and (8) with DDQ affords
natural trapezifolixanthone (5) and
5-(3-methylbut-2-eny1oxy)-6-deoxyjacareubin (9) respectively.
Cited by
10 articles.
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