Disclosed herein is an efficient synthetic route for the synthesis of functionalized 2-benzyl benzo[b]furans via a regioselective 5-exo-trig intramolecular oxidative cyclization of ortho-cinnamyl phenols using [PdCl2(CH3CN)2] as catalyst and benzoquinone as an oxidant. Further, a sequential ortho-cinnamylation of phenols using cinnamyl alcohols catalyzed by Re2O7, followed by an oxidative cyclization
本文所公开的是用于官能化的2-苄基苯并[合成的有效合成路线b ]呋喃经由区域选择性5 -外-TRIG分子内的氧化环化邻-使用肉桂酚[的PdCl 2(CH 3 CN)2 ]作为催化剂和苯醌作为氧化剂。此外,使用由Re 2 O 7催化的肉桂醇对苯酚进行邻位邻肉桂酸化,然后使用上述Pd催化剂进行氧化环化。反应显示出广泛的底物范围,具有良好至优异的产率。
Selective Benzylic and Allylic Alkylation of Protic Nucleophiles with Sulfonamides through Double Lewis Acid Catalyzed Cleavage of sp<sup>3</sup>Carbon-Nitrogen Bonds
broad range of tosyl‐activated benzylic and allylic amines to give diversely functionalized products in good to excellent yields and with high regioselectivity. Furthermore, the cross‐coupling reaction of 1,3‐dicarbonyl compounds with benzylic propargylicamine derivatives has been successfully applied to the one‐step synthesis of polysubstituted furans and benzofurans.
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).
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
Metal-free sequential reaction via a propargylation, annulation and isomerization sequence for the one-pot synthesis of 2,3-disubstituted benzofurans
作者:Wen-Tao Li、Wen-Hui Nan、Qun-Li Luo
DOI:10.1039/c4ra05503a
日期:——
A metal-freeone-potsynthesis of 2,3-disubstituted benzofurans is described, which allows for the reactions to be performed under ambient conditions with readily accessible propargyl alcohols and general phenols, including phenols substituted with an electron withdrawing group or a nitrogen-containing group.