Iron-Catalyzed Regioselective Hydroaryloxylation of CC Triple Bonds: An Efficient Synthesis of 2<i>H</i>-1-Benzopyran Derivatives
作者:Xiaobing Xu、Jun Liu、Linfeng Liang、Hongfeng Li、Yanzhong Li
DOI:10.1002/adsc.200900483
日期:2009.11
An efficient, regioselective, iron-catalyzed intramolecular hydroaryloxylation of 2-propargylphenols or naphthols is reported. The reactions proceed through an endo-dig cyclization to afford benzopyran or naphthopyran derivatives in good to high yields using iron(III) chloride as the catalyst with the assistance of aniline in dimethylformamide (DMF).
InCl<sub>3</sub>-Catalyzed Propargylation of Indoles and Phenols with Propargylic Acetates: Application to the Syntheses of Benzofurans and Naphthofurans
作者:Li Liu、Yong-Jun Chen、Zhe Liu、Zahid Shafiq、Yan-Chao Wu、Dong Wang
DOI:10.1055/s-2007-983735
日期:2007.7
InCl3-catalyzed propargylation of indoles and phenols was developed. A strategy combining propargylation with intramolecular cyclization was used to easily prepare 2-benzyl-3-arylbenzofurans and -naphthofurans, which are important pharmaceutical intermediates.
Iron-Catalyzed Direct Synthesis of Densely Substituted Benzofurans and Naphthopyrans from Phenolic Compounds and Propargylic Alcohols
作者:Feng-Quan Yuan、Fu-She Han
DOI:10.1002/adsc.201200804
日期:2013.2.1
propargylic alcohols in the presence of 5 mol% of iron(III) chloride hexahydrate (FeCl3⋅6 H2O) catalyst. On the other hand, pyran derivatives were obtained exclusively when tertiary propargylic alcohols were employed. Mechanistic studies revealed that presumably due to the discriminated steric effect of secondary and tertiary propargylic alcohols, the Fe-catalyzed Friedel–Crafts (F–C) reaction of phenols