Total Synthesis of Lamellarins G, J, L, and Z Using One-Pot Halogen Dance/Negishi Coupling
作者:Kazuki Morii、Yuto Yasuda、Daiki Morikawa、Atsunori Mori、Kentaro Okano
DOI:10.1021/acs.joc.1c01505
日期:2021.10.1
A bottom-up synthesis of lamellarins G, J, L, and Z was achieved via one-pot halogen dance/Negishi coupling of a lithiated dibromopyrrole derivative. The easily accessible dibromopyrrole bearing an ester moiety underwent halogen dance smoothly at −78 °C within 10 min. The resultant α-pyrrolyllithium was transmetalated to the corresponding organozinc species, which was then coupled with an aryl iodide
层状蛋白 G、J、L 和 Z 的自下而上合成是通过锂化二溴吡咯衍生物的一锅卤素舞蹈/Negishi 偶联实现的。易于获得的带有酯部分的二溴吡咯在-78°C 下10 分钟内顺利进行了卤素舞蹈。得到的 α-吡咯锂被金属转移到相应的有机锌物质上,然后在催化钯的存在下与芳基碘化物偶联以提供完全取代的吡咯。随后进行卤素 - 锂交换以仅在靠近酯部分的 β 位置掺入硼酸酯基团。这种合成中间体允许逐步二芳基化,用于层状蛋白 G、J、L 和 Z 的全合成。