Synthesis of ring-halogenated histidines and histamines

Add time:08/02/2019    Source:sciencedirect.com

Series of ring-halogenated histidines and histamines have been synthesized from the suitably protected parent bioimidazoles. The 5-X and 2,5-X2-derivatives are obtained by direct electrophilic halogenation while 2-X derivatives (X= Br and I) are prepared by regiospecific electrophilic dehalogenation at C-5.

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