Tetrahedron Letters p. 8083 - 8085 (2004)
Update date:2022-08-03
Topics:
Zheng, Xing
Meng, Wei-Dong
Qing, Feng-Ling
gem-Difluoromethylenated biflavonoid 1 was synthesized via the Suzuki coupling reaction. The key intermediate 6-iodonated flavone 4 was regioselectively synthesized by the use of AgOAc/I2 under mild conditions without handling of a strongly toxic reagent. The key step was the formation of a flavone 3′-boronate 3 using a palladium-catalyzed exchange of the corresponding 3′-iodonated flavone with a diboron reagent.
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