Regioselective 6-iodination of 5,7-dioxygenated flavones by benzyltrimethylammonium dichloroiodate
作者:Jérôme Quintin、Guy Lewin
DOI:10.1016/j.tetlet.2004.03.038
日期:2004.4
The iodination of 5,7-dioxygenated flavones with 1 equiv of benzyltrimethylammonium dichloroiodate (BTMA·ICl2) in the system CH2Cl2–MeOH–CaCO3 at room temperature is presented in this note. Flavones with a free phenol group at C5 and an alkoxy or a peracylglycosyloxy at C7 lead to the 6-iodoflavones with a good regioselectivity (ratio 6-iodination/8-iodination about 9).
本说明介绍了在室温下,在系统CH 2 Cl 2 -MeOH-CaCO 3中用1当量的苄基三甲基二氯碘酸铵(BTMA·ICl 2)对5,7-双加氧黄酮进行碘化。在C5处具有游离酚基的黄酮和在C7处具有烷氧基或过酰基糖基糖氧基的黄酮导致具有良好区域选择性的6-碘黄酮(6-碘化/ 8-碘化比约为9)。