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Synthesis of Azulene Derivatives from 2H-Cyclohepta[b]furan-2-ones as Starting Materials: Their Reactivity and Properties
Authors:Taku Shoji  Shunji Ito  Masafumi Yasunami
Affiliation:1.Department of Material Science, Graduate School of Science and Technology, Shinshu University, Matsumoto 390-8621, Japan;2.Graduate School of Science and Technology, Hirosaki University, Hirosaki 036-8561, Japan;3.Department of Chemical Biology and Applied Chemistry, College of Engineering, Nihon University, Koriyama 963-8642, Japan
Abstract:A variety of synthetic methods have been developed for azulene derivatives due to their potential applications in pharmaceuticals and organic materials. Particularly, 2H-cycloheptab]furan-2-one and its derivatives have been frequently used as promising precursors for the synthesis of azulenes. In this review, we describe the development of the synthesis of azulenes by the reaction of 2H-cycloheptab]furan-2-ones with olefins, active methylenes, enamines, and silyl enol ethers as well as their reactivity and properties.
Keywords:azulene  2H-cyclohepta[b]furan-2-one  cycloaddition  enamine  silyl enol ether
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