Reactions of ketene acetals—IX11Part VIII. J. Org. Chem. 41, 3018 (1976).
作者:Jean-Louis Grandmaison、Paul Brassard
DOI:10.1016/0040-4020(77)80312-8
日期:——
react with ketene acetals and give benzofurans, but in the presence of acetic acid, naphthoquinones are produced in variable yields. Some aspects of the reaction have been studied and the method has been applied to the synthesis of useful intermediates and of derivatives of some naturally occurring naphthoquinones such as tri-O-methylflaviolin 20 and tetra-O-methylspinochrome B 23. Benzoquinones also react
卤代苯醌与乙烯酮缩醛反应,生成苯并呋喃,但在乙酸存在下,萘醌的产量可变。反应的一些方面进行了研究,该方法已被应用到的有用的中间体的合成和一些天然存在的萘醌的衍生物,例如三- ö -methylflaviolin 20和四- ö -methylspinochrome乙 23。苯醌也可与共轭乙烯酮缩醛反应,而无酸催化作用,提供了方便的Ramentaceone 43,O-甲基苯乙烯戊酮45和1,3,6,8-四甲氧基蒽醌34的合成方法。