Synthesis of Benzo[c] and Naphtho[c]heterocycle Diesters and Dinitriles via Homoelongation
摘要:
Syntheses of benzo[c] and naphtho[c]heterocycle diesters and dinitriles were achieved via our newly developed iterative elongation protocol. The photophysical and electrochemical properties of these conjugated systems are explored.
Phosphane-Mediated Domino Synthesis of Tetrasubstituted Furans from Simple Terminal Activated Olefins
作者:Jianfang Wang、Rong Zhou、Zheng-Rong He、Zhengjie He
DOI:10.1002/ejoc.201200945
日期:2012.10
Convenient and highly efficient syntheses of tetrasubstitutedfurans with flexible substituent patterns fromsimple and readily available starting materials have been developed. Under very mild conditions, with the mediation of stoichiometric nBu3P, simpleterminalactivatedolefins and acyl chlorides or anhydrides smoothly furnish tetrasubstitutedfurans in modest to excellent yields. This synthetic
Ionic Liquid as Catalyst and Reaction Medium: A Simple and Efficient Procedure for Paal–Knorr Furan Synthesis
作者:Gangqiang Wang、Zhi Guan、Rongchang Tang、Yanhong He
DOI:10.1080/00397910902978049
日期:2010.1.14
The ionicliquid 1-butyl-3-methyl-imidazolium hydrogen sulfate, [bmim]HSO4, efficiently catalyzes Paal–Knorr furan synthesis without any organic solvent. A wide range of aliphatic and aromatic 1,4-diketones easily undergo condensations to form furan derivatives, providing a general and convenient procedure. The Paal–Knorr reaction of ester-substituted 1,4-diketones is first reported. The ionic liquid
Vicinal dianions of diethyl α-aroylsuccinates: preparation of functionalized-2,3-dihydrofurans and -furans, and diaxial 2,4-diaryl-3,7-dioxabicyclo[3.3.0]octanes
treatment of the adducts obtained with a catalytic amount of p-toluenesulfonic acid in refluxing toluene. cis-2,3-Dihydrofurans are used as precursors for the preparation of tetrasubstituted furans and diaxial 2,4-diaryl-3,7-dioxabicyclo[3.3.0]octanes.