Synthesis of 5-(1-Alkoxyalkylidene)tetronates by Direct Condensation Reactions of Tetronates with Thionolactones and Thionoesters
作者:Ya-Qing Huang、Xiong-Zhi Huang、Pei-Qiang Huang
DOI:10.1021/acs.joc.0c02502
日期:2021.2.5
thionolactones and thionoesters as activated forms of lactones/esters that allows the direct condensation with tetronates via one-pot enolate formation, nucleophilic addition, S-methylation, and DBU-promoted elimination. The value of the method was demonstrated by the stereoselective syntheses of two natural products: 5,6-Z-fadyenolide (Z/E ratio = 6:1) and 9,10-methylenedioxy-5,6-Z-fadyenolide (Z/E
我们报告了从内酯/酯开始的双环和单环5-(1-烷氧基亚烷基)代酸酯的两步方法。该方法的特征在于使用硫代内酯和硫代酸酯作为内酯/酯的活化形式,其允许通过一锅式烯醇化物形成,亲核加成,S-甲基化和DBU促进的消除而与四价酸酯直接缩合。该方法的价值通过两种天然产物的立体选择性合成得到证明:5,6- Z-脂肪酸(Z / E比= 6:1)和9,10-亚甲基二氧基-5,6- Z-脂肪酸(Z / E比= 9:1)。