Regioselective Synthesis of β-Aryl- and β-Amino-Substituted Aliphatic Esters by Rhodium-Catalyzed Tandem Double-Bond Migration/Conjugate Addition
作者:Dominik M. Ohlmann、Lukas J. Gooßen、Markus Dierker
DOI:10.1002/chem.201100654
日期:2011.8.16
unsaturated esters. Once the double‐bond is in conjugation with the carboxylate group, they also catalyze the Michael addition of carbon and nitrogen nucleophiles. In the presence of these catalysts, unsaturated carboxylates enter a dynamic equilibrium of positional and geometrical double‐bond isomers. The conjugated species are continuously removed through 1,4‐additions with formation of β‐amino esters or
发现亚磷酸铑催化剂可有效介导不饱和酯内的双键迁移。一旦双键与羧酸酯基结合,它们还将催化碳和氮亲核试剂的迈克尔加成。在这些催化剂的存在下,不饱和羧酸盐进入位置和几何双键异构体的动态平衡。根据所使用的亲核试剂,通过1,4加成不断地除去结合物,形成β-氨基酯或β-芳基化产物。证明了这两种方案对一系列底物的适用性,例如不同链长和双键位置的脂肪酸酯,以及包括芳基硼酸酯和伯胺和仲胺在内的几种亲核试剂。