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Guojun Pan,Ke Yang,Yantao Ma,Xia Zhao,Kui Lu,Peng Yu 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.5
C-6 and C-8 monobromo flavonoids are important building blocks for the synthesis of flavonoid natural products and their derivatives. Bromination of suitably alkylated flavonoids with N-bromosuccinimide in dichloromethane (DCM), followed by deprotection with BCl3, gives either a C-6 or a C-8 monobromo flavonoid in high yield and with high regioselectivity, depending on the protection pattern of the C-5 and C-7 OH groups. The mild and neutral conditions are particularly useful for the regioselective bromination of acid-labile substrates.