A Highly Efficient Friedel-Crafts Reaction of 3-Hydroxyoxindoles and Aromatic Compounds to 3,3-Diaryl and 3-Alkyl-3-aryloxindoles Catalyzed by Hg(ClO4)2⋅3 H2O
作者:Feng Zhou、Zhong-Yan Cao、Jing Zhang、Hai-Bo Yang、Jian Zhou
DOI:10.1002/asia.201100773
日期:2012.1.2
other screened metal perchlorate hydrates and Brønsted acids such as HOTf and HClO4. The high catalytic property of Hg(ClO4)2⋅3 H2O originates from the unprecedented dual activation effects of aromatic mercuration, which could generate a strong protic acid to facilitate the generation of a carbocation at the C3‐position of oxindoles and simultaneously form the more reactive nucleophilic reaction partner
我们报道了3-烷基或3-芳基3-羟基羟吲哚与各种芳香族和杂芳族化合物到不对称的3,3-二芳基羟吲哚或3-烷基-3-芳基羟吲哚的高效弗里德-克来福特反应,这是有趣的药物靶点,天然产物合成的有用组成部分。汞柱(CLO 4)2 ⋅ 3小时2 O的确定为用于该反应的一个功能强大的催化剂,并且是显著比其他屏蔽金属高氯酸盐水合物更有效和布朗斯台德酸如HOTf和的HClO 4。汞的高催化性能(CLO 4)2 ⋅ 3小时2O源自芳香族汞的空前的双重活化作用,它可以生成强质子酸,以促进在羟吲哚的C3位碳正离子的生成,并同时形成更具反应性的亲核反应伙伴。