On theClaisen Rearrangement of Allyl Ethyl Ketene Acetals Generatedin situ via Benzeneselenenic Acid Eliminiation
作者:Rita Pitteloud、Martin Petrzilka
DOI:10.1002/hlca.19790620445
日期:1979.6.8
alcohols 5, undergo benzeneselenenic acid elimination to transient ketene acetals 8 which afford γ, δ-unsaturated esters 9via the ester Claisen rearrangement (Scheme 2). Under the same conditions selenoxide 7h derived from benzyl alcohol 5h is converted back to benzyl alcohol with the concomitant formation of ethylphenylselenoacetate 12.
由简单的两步法由单环和双环烯丙基醇5制备的苯硒基乙醛混合缩醛7经过苯硒酸消除,生成瞬态乙烯酮缩醛8,后者通过酯Claisen重排反应得到γ,δ-不饱和酯9 (方案2)。在相同条件下,衍生自苄醇5h的亚硒酸酯7h被转化回苄醇,并伴随形成乙基苯基硒乙酸乙酯12。