Synthesis of Highly Substituted Furans by the Electrophile-Induced Coupling of 2-(1-Alkynyl)-2-alken-1-ones and Nucleophiles
作者:Tuanli Yao、Xiaoxia Zhang、Richard C. Larock
DOI:10.1021/jo0510585
日期:2005.9.1
induced by an electrophile, provides highlysubstitutedfurans in good to excellent yields under very mild reaction conditions. Various nucleophiles, including functionally substitutedalcohols, H2O, carboxylic acids, 1,3-diketones, and electron-rich arenes, and a range of cyclic and acyclic 2-(1-alkynyl)-2-alken-1-ones readily participate in these cyclizations. Iodine, NIS, and PhSeCl have proven
Stereoselective synthesis of bicyclo[3.n.1]alkenone frameworks by Lewis acid-catalysis
作者:Stalin R. Pathipati、Lars Eriksson、Nicklas Selander
DOI:10.1039/c7cc06400d
日期:——
An intermolecular cyclization of alkynyl enones with cyclic ketones for the synthesis of bicyclo[3.n.1]alkenones is reported. This protocol exhibits a high functional group tolerance and provides access to a variety of bicyclic systems found as skeletons in many natural products.
Described is the development of a highly efficient 2π disrotatory ring‐opening aromatization sequence using bicyclo[3.1.0]hexan‐2‐ones. This unprecedented transformation efficiently proceeds under thermal conditions and allows facile construction of uniquely substituted and polyfunctionalized benzoates. In the presence of either amines or alcohols formation of substituted anilines or ethers, respectively,
Electrophilic Cyclization of 2-(1-Alkynyl)-2-alken-1-ones Using the I<sub>2</sub>/K<sub>3</sub>PO<sub>4</sub> System: An Efficient Synthesis of Highly Substituted Iodofurans
作者:Yuanhong Liu、Shaolin Zhou
DOI:10.1021/ol051659i
日期:2005.10.1
[reaction: see text] The electrophiliccyclization of 2-(1-alkynyl)-2-alken-1-ones in the presence of various alcohols or carbon-based nucleophiles offers an efficient and straightforward route to highly substituted iodofurans under extremely mild reaction conditions. The iodo derivatives are potential synthetic intermediates for amplification of molecular complexity.