Carbopalladation/Suzuki Coupling Cascade for the Generation of Quaternary Centers: Access to Pyrrolo[1,2-<i>b</i>]isoquinolines
作者:Iratxe Barbolla、Nuria Sotomayor、Esther Lete
DOI:10.1021/acs.joc.9b01357
日期:2019.8.16
A convergent route to pyrrolo[1,2-b]isoquinolines with a quaternary center at C-10 has been developed, which implies a sequential Pd(0)-catalyzed carbopalladation followed by cross-coupling reaction with boronic acids. The adequate catalytic system and experimental conditions, with and without the use of phosphane ligands, have been selected to control the chemoselectivity of the process, allowing
已经开发了一条以四元中心在C-10上的吡咯并[1,2- b ]异喹啉的收敛途径,这意味着先后顺序是Pd(0)催化的碳钯反应,然后与硼酸进行交叉偶联反应。选择了适当的催化体系和实验条件,可以选择使用或不使用膦配体来控制该过程的化学选择性,从而使6-exo-carbopalladation生成四元中心并避免直接的Suzuki偶联。可以使用多种富电子和缺电子的芳基硼酸,以中等至良好的产率(最高94%,22个例子)为取代的吡咯并[1,2- b ]异喹啉提供有效的途径。