作者:Arbia Talbi、Aïcha Arfaoui、Mohamed Lotfi Efrit、Anne Gaucher、Hédi M'Rabet、Damien Prim
DOI:10.1016/j.tet.2022.132926
日期:2022.9
an efficient and selective functionalization of α-methylene-γ-butyrolactone. The two-step sequence involves the preparation of bromomethylene butyrolactone 2 in good yield prior to a palladium-catalyzed coupling process. The latter allowed the installation of aryl, alkenyl, and alkynyl groups under Suzuki-Miyaura, Heck, and Sonogashira cross-coupling conditions. The reaction sequences involving Pd(dppf)Cl2-CsF
我们描述了 α-亚甲基-γ-丁内酯的有效和选择性功能化。两步顺序包括在钯催化偶联过程之前以良好收率制备溴亚甲基丁内酯2 。后者允许在 Suzuki-Miyaura、Heck 和 Sonogashira 交叉偶联条件下安装芳基、烯基和炔基。涉及 Pd(dppf)Cl 2 -CsF、Pd(OAc) 2 -PPh 3 -Ag 2 CO 3、Pd(PPh 4 ) 4 -CuI-Et 3 N 作为相应催化体系的反应序列允许制备前所未有的α-不饱和取代丁内酯组4– 16从中等到极好的产量。在所有情况下,无论引入的取代基的性质如何,外双键的E构型从起始材料到目标都保持不变。