Enantioselective Michael Additions to α,β-Unsaturated Imides Catalyzed by a Salen−Al Complex
作者:Mark S. Taylor、Eric N. Jacobsen
DOI:10.1021/ja037177o
日期:2003.9.1
conjugate addition of di- and trisubstituted nitriles to a wide range of acyclic alkyl- and aryl-substituted α,β-unsaturated imides. This new methodology provides access to multifunctional compounds that previously have not been readily accessible in enantioenriched form. Synthetic applications of these products include the preparation of enantiomerically enriched piperidines, as exemplified by an expedient
Highly Enantioselective, Catalytic Conjugate Addition of Cyanide to α,β-Unsaturated Imides
作者:Glenn M. Sammis、Eric N. Jacobsen
DOI:10.1021/ja034635k
日期:2003.4.1
(Salen)Al−Cl complex 1a catalyzes the asymmetric conjugate addition of hydrogen cyanide to α,β-unsaturated imides in high yields and enantioselectivities. The cyanide adducts can readily be converted into a variety of useful chiralbuildingblocks, including α-substituted-β-amino acids and β-substituted-γ-aminobutyric acids. Mechanistic data obtained thus far point to a cooperative bimetallic mechanism
Cooperative Dual Catalysis: Application to the Highly Enantioselective Conjugate Cyanation of Unsaturated Imides
作者:Glenn M. Sammis、Hiroshi Danjo、Eric N. Jacobsen
DOI:10.1021/ja046653n
日期:2004.8.1
Cooperative heterobimetallic catalysis was used as a design principle to achieve a highly reactive system for the enantioselective conjugate addition of cyanide to alpha,beta-unsaturated imides. A dual-catalyst pathway involving chiral (salen)Al complex 1b and chiral (pybox)Er complex 4b provides measurable improvements in rates and enantioselectivities relative to single-catalyst systems. Mechanistic
协同异双金属催化被用作设计原理,以实现氰化物对映选择性共轭加成到 α,β-不饱和酰亚胺的高反应性系统。涉及手性 (salen)Al 配合物 1b 和手性 (pybox)Er 配合物 4b 的双催化剂途径提供了相对于单催化剂系统的速率和对映选择性的可测量改进。机理研究指出了一种协同双金属机制,包括通过 Al 配合物激活酰亚胺和通过 Er 配合物激活氰化物。
Dinuclear {(salen)Al} Complexes Display Expanded Scope in the Conjugate Cyanation of α,β-Unsaturated Imides
作者:Clément Mazet、Eric N. Jacobsen
DOI:10.1002/anie.200704461
日期:2008.2.15
Asymmetric Synthesis of β-Amino Acid Derivatives via Catalytic Conjugate Addition of Hydrazoic Acid to Unsaturated Imides