Stereoretentive Nucleophilic Substitution at the Tetrasubstituted Carbon of Galiellalactone
作者:Zilma Escobar、Jakob Nilsson、Ritha Gidlöf、Martin Johansson、Olov Sterner
DOI:10.1021/acs.joc.0c00152
日期:2020.6.19
(1) was, as its acetate 4, discovered to undergo a substitution reaction with cysteine derivatives. By studying the reaction mechanism and the intermediates formed, and in an effort to expand the chemical diversity of the galiellalactonoids, a mild and general method of preparing ether, thioether, and amine analogues of galiellalactone was developed. The reaction is a formal stereoretentive nucleophilic
真菌代谢产物加利拉内酯(1)为乙酸盐4被发现与半胱氨酸衍生物发生取代反应。通过研究反应机理和所形成的中间体,并努力扩大加利拉内酯的化学多样性,开发了一种温和而通用的制备加利拉内酯的醚,硫醚和胺类似物的方法。该反应是在氧化的叔碳处的正式的立体保持亲核取代。进行的反应的NMR分析表明,它涉及初始的烯丙基取代以形成新的迈克尔受体,然后向该反应物中添加第二当量的亲核试剂,最后是逆迈克尔反应。这将恢复原始的galiellalactone系统,在C-2a和C-3之间具有双键,但在C-7b处具有新的取代基。由于加利拉内酯是一种有前途的STAT3抑制剂,