The organocatalytic enantioselective [3+2] cycloaddition reaction of α,β-unsaturated aldehydes with azomethine ylides applied to the asymmetric synthesis of densely substituted pyrroloisoquinolines
作者:Ainara Iza、Iratxe Ugarriza、Uxue Uria、Efraím Reyes、Luisa Carrillo、Jose L. Vicario
DOI:10.1016/j.tet.2013.08.012
日期:2013.10
The synthesis of densely functionalized pyrrolo[2,1-a]isoquinolines was accomplished using the organocatalytic [3+2] cycloaddition between enals and azomethine ylides under iminium catalysis developed in our group some years ago as the key step. The cycloaddition proceeds smoothly yielding the corresponding pyrrolidine as a single endo diastereoisomer with enantiopurity in the range of 94–96% and further
密集地官能化吡咯的合成[2,1-一个]异喹啉,使用下我们组开发了一些年前,作为关键步骤亚胺催化enals和甲亚胺叶立德之间的有机催化的[3 + 2]环加成来完成。环加成顺顺利得到相应的吡咯烷作为一个单一的内使用高产反应协议和最终甲磺酰化,在94-96%的范围内,将得到的cycloadducts进一步操作对映体非对映体/分子内N-烷基化序列允许目标的合成在其中在第一步骤中安装的所有立构中心的完整性得以维持的化合物。