allylmalonate this migration could be partially or completely controlled using appropriate reaction conditions. The ramification on the alkyl chain and the substituents on the aryl halide have also an important influence on this migration. Moreover, the cis,cis,cis-1,2,3,4-tetrakis(diphenylphosphinomethyl)cyclopentane/1/2[PdCl(C3H5)]2 system catalyses this reaction with a wide range of aryl bromides using
芳基卤化物与官能化的烷基-1-烯的Heck反应应该是合成官能化的(E)-1-芳基烷基-1-烯衍生物的有效方法。该反应的主要问题是当烷基-1-烯的C3碳原子上没有取代基时,钯催化的碳-碳双键沿烷基链的迁移。我们观察到,对于戊-4-烯酸乙酯,2-甲基戊-4-烯酸乙酯或烯丙基丙二酸二甲酯的芳基化,可以使用适当的反应条件部分或完全控制这种迁移。烷基链上的分枝和芳基卤化物上的取代基对这种迁移也有重要影响。此外,顺式,顺式,顺式-1,2,3,4-四(二苯基膦甲基)环戊烷/ 1/2 [PdCl(C 3 H 5)] 2体系使用非常高比例的底物/催化剂以良好的收率催化多种芳基溴化物的反应。
Highly Regio- and Enantioselective Pd-Catalyzed Allylic Alkylation and Amination of Monosubstituted Allylic Acetates with Novel Ferrocene <i>P,N</i>-Ligands
作者:Shu-Li You、Xia-Zhen Zhu、Yu-Mei Luo、Xue-Long Hou、Li-Xin Dai
DOI:10.1021/ja016121w
日期:2001.8.1
Chemo-, Regio- and Stereoselective Heck Arylation of Allylated Malonates: Mechanistic Insights by ESI-MS and Synthetic Application toward 5-Arylmethyl-γ-lactones
作者:Caio C. Oliveira、Marcelo V. Marques、Marla N. Godoi、Thaís Regiani、Vanessa G. Santos、Emerson A. F. dos Santos、Marcos N. Eberlin、Marcus M. Sá、Carlos R. D. Correia
DOI:10.1021/ol502529v
日期:2014.10.3
We describe herein a general method for the controlled Heck arylation of allylated malonates. Both electron-rich and electron-poor aryldiazonium salts were readily employed as the aryl-transfer agents in good yields and in high chemo-, regio-, and stereoselectivity without formation of decarboxylated byproducts. Reaction monitoring via ESI-MS was used to support the formation of chelated Pd species