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
Biomimetic synthetic studies on lactonamycin: an expedient synthesis of dihydroxy-isoindolinone-carboxylates
作者:Sylvain A. Jacques、Bhavesh H. Patel、Anthony G.M. Barrett
DOI:10.1016/j.tetlet.2011.08.173
日期:2011.11
The synthesis of dihydroxy-isoindolinone-carboxylates from a dioxinone keto-ester and N-protected sarcosine without the use of phenolic protection is described. Base-induced aromatization of the dioxinone diketo-ester followed by lactamization furnished the desired dihydroxy-isoindolinone moiety, which could be used as an EF-ring precursor toward the synthesis of lactonamycin. (C) 2011 Elsevier Ltd. All rights reserved.