Synthesis of the hexacyclic triterpene core of the jujuboside saponins via tandem Wolff rearrangement–intramolecular ketene hetero-Diels–Alder reaction
作者:Rashad R. Karimov、Derek S. Tan、David Y. Gin
DOI:10.1016/j.tet.2018.04.051
日期:2018.6
The jujubosides are saponin natural products reported to have immunoadjuvant, anticancer, antibacterial, antifungal, and antisweet activities. The triterpene component, jujubogenin contains a unique tricyclic ketal motif comprising the DEF ring system. Herein, we describe our efforts toward the total synthesis of jujubogenin, using a sterically-demanding intermolecular Diels-Alder reaction to assemble
大枣甙是皂素天然产物,据报道具有免疫佐剂,抗癌,抗菌,抗真菌和抗甜活性。三萜成分jujubogenin包含一个独特的三环缩酮基序,该基序包含DEF环系统。在本文中,我们描述了我们在利用分子间的Diels-Alder反应组装C环和串联Wolff重排-分子内烯酮杂Diels-Alder反应以形成DF环系统的过程中全枣合成的努力。 。然后将所得双环烯醇醚进行酸催化的环化反应,使E环闭合,从而提供了jujubogenin的六环核。