Sequential Ketene Generation from Dioxane-4,6-dione-keto-dioxinones for the Synthesis of Terpenoid Resorcylates
作者:Daniel C. Elliott、Tsz-Kan Ma、Aymane Selmani、Rosa Cookson、Philip J. Parsons、Anthony G. M. Barrett
DOI:10.1021/acs.orglett.6b00533
日期:2016.4.15
Trapping of the ketene generated from the thermolysis of 2-methyl-2-phenyl-1,3-dioxane-4,6-dione-keto-dioxinone at 50 °C with primary, secondary, or tertiary alcohols gave the corresponding dioxinone β-keto-esters in good yield under neutral conditions. These intermediates were converted by palladium(0)-catalyzed decarboxylative allyl migration and aromatization into the corresponding β-resorcylates
在50°C下用伯,仲或叔醇热解2-甲基-2-苯基-1,3-二恶烷-4,6-二酮-酮二恶烷酮所产生的乙烯酮,得到相应的二恶英酮β-酮酯在中性条件下收率高。这些中间体通过钯(0)催化的脱羧烯丙基迁移和芳构化转化为相应的β-间苯二酸酯。这些转化应用于天然产物(±)-大麻二甲铬酸和(±)-十二碳二烯酸的合成。