A Regiodivergent Synthesis of Ring A C-Prenylflavones.

[摘要]：(Biomolecules and Their Synthetic Analogs) Section Capitalizing on the use of orthogonal protecting groups and the development of a modified Robinson flavone synthesis that avoids harsh acidic conditions, a regioselective synthesis of 6- and 8-prenylflavones from the same prenylated disilylated phloracetophenone I has been developed, targeting cannflavin B II (R1 = CH2CH:CMe2, R2 = H), the COX-inhibiting principle of marijuana, and its unnatural isomer isocannflavin B II (R1 = H, R2 = CH2CH:CMe2) as model compds.

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