Anodic oxidation of cycloheptatrienes has been found to be one of the most powerful key tools for the preparation of a variety of non-benzenoidaromaticcompounds such as tropylium salts, tropones, tropolones, 2H-cyclohepta[b]furan-2-ones, and azulenes.
The Sensitized Photooxidation of Methoxycycloheptatrienes. The Synthesis of α-, β-, and γ-Tropolones
作者:Morio Yagihara、Yoshio Kitahara、Toyonobu Asao
DOI:10.1246/bcsj.53.236
日期:1980.1
The sensitized photooxidation of 7-methoxycycloheptatriene (7-methoxytropilidene) afforded [4+2] cycloadduct (2), tropone, benzaldehyde and their 2-methoxy derivatives. Thermal isomerization of 2 followed by the treatment with alumina yielded 4-methoxytropone. The photooxidation of 1-methoxytropilidene gave 4-hydroxytropone and o-methoxybenzaldehyde, and the photooxidation of 3-methoxytropilidene followed
compound to a tropylium salt, by the anodic oxidation of CHT in methanol. The further anodic oxidation of 3-MCHT prepared from 7-MCHT has been found to be an effective method of synthesis of tropone and tropolone.