Hot water-promoted cyclopropylcarbinyl rearrangement facilitates construction of homoallylic alcohols
作者:Pei-Fang Li、Cheng-Bo Yi、Jin Qu
DOI:10.1039/c5ob00305a
日期:——
H2O–1,4-dioxane and without an additional catalyst, the rearrangements of various types of cyclopropylcarbinols were attempted. It was found that the reactions generally gave homoallylic alcohols in good to very high chemical yields. Rearrangements of bicyclic or tricyclic cyclopropylcarbinols readily gave the desired ring-expanded cyclic homoallylic alcohols which are difficult to synthesize by other
A facile, copper-catalyzed aminoarylation reaction of various aryl/alkyl alkynes was realized by utilizing N-fluoroarylsulfonimides (NFSI) as aminoarylation or amination reagent with hydroxyl as directing group. With this methodology, various α,β-unsaturated carbonyl compounds and indenones were efficiently constructed, and the synthetic application for indole derivatives was also provided. The aminoarylation
Gold(I)-Catalyzed Rearrangement of Propargyl Benzyl Ethers: A Practical Method for the Generation and in Situ Transformation of Substituted Allenes
作者:Benoit Bolte、Yann Odabachian、Fabien Gagosz
DOI:10.1021/ja1020469
日期:2010.6.2
of benzyl propargyl ethers react with a gold(I) catalyst to furnish variously substituted allenes via a 1,5-hydride shift/fragmentation sequence. This transformation is rapid and practical. It can be performed under very mild conditions (room temperature or 60 degrees C) using terminal as well as substituted alkyne substrates bearing a primary, secondary, or tertiary benzyl ether group. The allenes
A practical synthesis of benzothiophenes via visible-light-promoted cyclization of disulfides and alkynes
作者:Lin-Miao Ye、Lu Qian、Yan-Yan Chen、Xue-Jing Zhang、Ming Yan
DOI:10.1039/c6ob02461k
日期:——
Visible-light-promoted radical cyclization of disulfides and alkynes provided benzothiophenes in good yields.
可见光促进的二硫化物和炔烃的自由基环化反应可以高产得苯并噻吩。
Cu(I)-Catalyzed Oxidative Cyclization of Enynamides: Regioselective Access to Cyclopentadiene Frameworks and 2-Aminofurans
作者:Wen-Bo Shen、Xiang-Ting Tang、Ting-Ting Zhang、Si-Yu Liu、Jiang-Man He、Tong-Fu Su
DOI:10.1021/acs.orglett.0c02317
日期:2020.9.4
An efficient Cu(I)-catalyzed oxidative cyclization of alkynyl-tethered enynamides for the construction of fused bicyclic cyclopentadiene derivatives is disclosed. The cascade proceeds through alkyne oxidation, carbene/alkyne metathesis, and formal (3 + 2) cycloaddition. Employing aryl-tethered enynamides as starting materials, substituted 2-aminofurans can be exclusively formed.