Deacylative Allylation: Allylic Alkylation via Retro-Claisen Activation
作者:Alexander J. Grenning、Jon A. Tunge
DOI:10.1021/ja205717f
日期:2011.9.21
"deacylative allylation", the coupling partners, an allylic alcohol and a ketone pronucleophile, undergo in situ retro-Claisen activation to generate an allylic acetate and a carbanion. In the presence of palladium, these reactive intermediates undergo catalytic coupling to form a new C-C bond. In comparison to unimolecular decarboxylative allylation, a commonly utilized method for allylation of carbon
本文描述了多种相对不稳定的碳亲核试剂的烯丙基烷基化的新方法。在这个“脱酰基烯丙基化”过程中,偶联伙伴,烯丙醇和酮亲核试剂,进行原位逆克莱森活化以生成烯丙乙酸和碳负离子。在钯的存在下,这些反应性中间体进行催化偶联形成新的 CC 键。与单分子脱羧烯丙基化(一种常用的碳阴离子烯丙基化方法)相比,脱酰基烯丙基化是一种分子间过程。此外,脱酰基烯丙基化允许容易获得的烯丙醇直接偶联。最后,通过快速构建多种 1、
Nickel-Catalysed Bis-Allylation of Activated Nucleophiles with Allyl Alcohol
作者:Rémi Blieck、Mohamed Salah Azizi、Alexis Mifleur、Maxime Roger、Clément Persyn、Mathieu Sauthier、Hélène Bonin
DOI:10.1002/ejoc.201501556
日期:2016.2
Nickel-based catalysis allows the efficient bis-allylation of soft nucleophiles with allylic alcohols. The reaction is best promoted by a combination of Ni(cod)2 (cod = cyclooctadienyl) and diphenylphosphinobutane under additive-free conditions. Alternatively, nickel(II) precursors can be used provided that a reductant is used to generate the nickel(0) species. The NiCl2/Zn combination is particularly
镍基催化允许软亲核试剂与烯丙醇的有效双烯丙基化。在无添加剂的条件下,Ni(cod)2(cod = 环辛二烯基)和二苯基膦丁烷的组合可以最好地促进反应。或者,可以使用镍 (II) 前体,前提是使用还原剂生成镍 (0) 物种。NiCl2/Zn 组合特别简单,可以有利地替代对空气更敏感的 Ni(cod)2 前体的使用。使用适用于双烯丙基化反应的亲核试剂和烯丙基衍生物研究了反应范围。
Pd-Catalyzed α-Allylation of 2-Phenylpropanal and other Carbonyl Compounds with Allyl Alcohol and Allyl Acetates/Carbonates in Ionic Liquids
作者:Martin Hut’ka、Štefan Toma
DOI:10.1007/s00706-007-0710-6
日期:2007.11
allylation of 2-phenylpropanal with allyl alcohol in ionic liquid is described and thus a simplier reaction composition catalytic system than in THF is possible. On the other hand, the Pd-catalyzed α-allylation of the same substrate with allyl acetate or allyl ethyl carbonate is proceeding nicely in ionic liquids. Allylation of different carbonyl derivatives was studied and it was found that the reaction is
(1,2N) and (3,2N)-carbocyclic-2-amino tetralin derivatives
申请人:The Upjohn Company
公开号:US05491236A1
公开(公告)日:1996-02-13
This invention is therapeutically useful tetralins and pharmaceutically acceptable acid addition salts thereof of the formula ##STR1## wherein R, R.sub.1 and A are as defined in claim 1. These compounds are useful to treat central nervous system disorders.
An Unexpected Directing Effect in the Asymmetric Transfer Hydrogenation of α,α-Disubstituted Ketones
作者:Rina Soni、John-Michael Collinson、Guy C. Clarkson、Martin Wills
DOI:10.1021/ol201643v
日期:2011.8.19
alpha,alpha-Disubstituted ketones containing an aromatic ring or alkene are reduced in high enantiomeric excess using an asymmetric transfer hydrogenation catalyst. The sense of reduction indicates that the unsaturated region of the ketone adopts a position adjacent to the Ru-bound eta(6)-arene ring in the reduction transition state.