Indium/copper-mediated conjugate addition of unactivated alkyl iodides to α,β-unsaturated carbonyl compounds in water
摘要:
An efficient method for the conjugate addition of unactivated alkyl iodides to alpha,beta-Unsaturated carbonyl compounds using indium/copper in water is described. The reactions proceed more efficiently in water than in organic solvents. In, CuI, and InCl3 are all essential for efficient reaction. Formation of a symmetrical vic-diarylalkane is observed when an aryl-substituted alkene is used as substrate. (C) 2009 Elsevier Ltd. All rights reserved.
Direct Copper(I) Iodide Dimethyl Sulfide Catalyzed Conjugate Addition of Alkenyl Groups from Vinylzirconocene Reagents
作者:Amer El-Batta、Taleb R. Hage、Steve Plotkin、Mikael Bergdahl
DOI:10.1021/ol036141y
日期:2004.1.1
text] CuI.0.75DMS complex is an excellent catalyst for the direct conjugate addition of alkenyl groups from vinylzirconocene reagents to alpha,beta-unsaturated aldehydes and ketones. The presence of the catalyst with an alkenylzirconocene, at +40 degrees C in THF, circumvents the need for making discrete alkenylcopper reagents. The catalyst is superior in terms of product yields and alkene flexibility
Heterogeneous double-activation catalysis: Rh complex and tertiary amine on the same solid surface for the 1,4-addition reaction of aryl- and alkylboronic acids
作者:Hiroto Noda、Ken Motokura、Wang-Jae Chun、Akimitsu Miyaji、Sho Yamaguchi、Toshihide Baba
DOI:10.1039/c5cy00133a
日期:——
Double-activation catalysis by a rhodium complex/tertiary amine catalyst for the 1,4-addition of organoboronic acids was investigated. A rhodium complex and a tertiary amine were co-immobilized on the same silicasurface by silane-coupling reactions followed by complexation of the Rh species. Structures of the Rh complex and tertiary amine on the silicasurface were determined by solid-state 13C and
研究了铑配合物/叔胺催化剂对有机硼酸的1,4-加成的双活化催化作用。通过硅烷偶联反应将铑配合物和叔胺共固定在同一二氧化硅表面上,然后使Rh物种络合。通过固态13 C和29 Si MAS NMR,XAFS和XPS测量确定二氧化硅表面上的Rh络合物和叔胺的结构。固定化的叔胺加速了Rh催化的苯基硼酸向环己烯酮的1,4-加成反应。固态11阐明了锚固叔胺在1,4-加成反应中的作用B MAS NMR:它激活芳基硼酸形成四配位的硼物种,然后加速Rh络合物催化的1,4-加成中的金属转移步骤。二氧化硅负载的Rh络合物/叔胺催化剂体系可适用于各种芳基-甚至烷基-硼酸的反应。
ASYMMETRIC SYNTHESIS OF ORGANIC COMPOUNDS
申请人:Isis Innovation Limited
公开号:US20140303385A1
公开(公告)日:2014-10-09
The present invention provides processes for the production of chiral compounds in a stereoisomeric excess. The present processes involve reacting a hydrometallated alkene compound with a compound comprising a conjugated-bond system under conditions such that the compounds undergo an asymmetric 1,4- or 1,6-conjugate addition reaction, generating a chiral compound in a stereoisomeric excess. The reaction is performed in the presence of a metal catalyst, which catalyst preferably comprises a non-racemic chiral ligand.
Copper-catalyzed conjugate additions of organozirconocenes. Synthetic and mechanistic studies.
作者:Peter Wipf、Wenjing Xu、Jacqueline H. Smitrovich、Roman Lehmann、Luigi M. Venanzi
DOI:10.1016/s0040-4020(01)85058-4
日期:1994.2
broad range of functional groups are tolerated in the conjugate addition process. Unsaturated N-acyl oxazolidinones give high diastereoselectivities for the formation of the new asymmetric carbon. The resulting zirconium enolates can be used for tandem aldoladdition reactions to aldehydes. Depending on the type of copper salt used, slow or fast formation of copper mirror occurs, but no intermediate
在3–10 mol%的Cu(l)盐(例如CuBr·S Me 2或CuCN)存在下,烷基锆茂金属很容易添加到α,β-不饱和酮,醛和砜中。反应产率对路易斯酸和碱的存在敏感。在共轭加成过程中可以耐受立体位阻以及广泛的官能团。不饱和氮-酰基恶唑烷酮类对形成新的不对称碳具有高的非对映选择性。所得的烯醇锆可用于醛醇的串联醇醛加成反应。根据所用铜盐的类型,会发生缓慢或快速形成铜镜的现象,但是在光谱学上没有检测到中间的铜物种。因此,提出了一种机理,该机理涉及路易斯酸性的锆茂并烯的烯酮络合,然后烷基取代基的内球转移到螯合的Cu(l)上。
[EN] ASYMMETRIC SYNTHESIS OF ORGANIC COMPOUNDS<br/>[FR] SYNTHÈSE ASYMÉTRIQUE DE COMPOSÉS ORGANIQUES
申请人:ISIS INNOVATION
公开号:WO2013054131A1
公开(公告)日:2013-04-18
The present invention provides processes for the production of chiral compounds in a stereoisomeric excess. The present processes involve reacting a hydrometallated alkene compound with a compound comprising a conjugated -bond system under conditions such that the compounds undergo an asymmetric 1,4- or 1,6-conjugate addition reaction, generating a chiral compound in a stereoisomeric excess. The reaction is performed in the presence of a metal catalyst, which catalyst preferably comprises a non-racemic chiral ligand.