作者:Filipe Manjolinho、Matthias F. Grünberg、Nuria Rodríguez、Lukas J. Gooßen
DOI:10.1002/ejoc.201200766
日期:2012.9
ketones. The key advantage of the new reaction protocol is that preformation of the allyl esters is not required. The reaction is believed to proceed via phosphane-mediated decarboxylation of the α-oxocarboxylates, leading to acyl anion equivalents that are allylated within the coordination sphere of the palladium catalyst. Under the reaction conditions, the double bond then migrates into conjugation
发现由 Pd(PPh3)4 和 P(pTol)3 组成的催化剂体系可有效促进 α-氧代羧酸与碳酸二烯丙酯的分子间脱羧偶联,得到 α,β-不饱和酮。新反应方案的主要优点是不需要预先形成烯丙酯。据信,该反应通过磷烷介导的 α-氧代羧酸酯脱羧进行,导致在钯催化剂的配位范围内烯丙基化的酰基阴离子等价物。在反应条件下,双键然后迁移到与羰基共轭。