Cross-metathesis reaction. Generation of highly functionalized olefins from unsaturated alcohols
作者:Janine Cossy、Samir BouzBouz、Amir H Hoveyda
DOI:10.1016/s0022-328x(01)01125-1
日期:2001.9
A cross-metathesis reaction was achieved between acid- and base-sensitive functionalized olefins and electron-deficient olefins or allylsilane by using the recyclable ruthenium catalyst V at room temperature. The cross-metathesis products are isolated in moderate to good yield. Ratios of E and Z cross-metathesis products depend upon substituents on the electron-deficient coupling partner.
In Situ Preparation of a Highly Active N-Heterocyclic Carbene-Coordinated Olefin Metathesis Catalyst
作者:John P. Morgan、Robert H. Grubbs
DOI:10.1021/ol0063510
日期:2000.10.1
active N-heterocyclic carbene-coordinatedcatalysts may be synthesized and used in situ, without requiring prior isolation of the catalyst. Activation of this in situ catalyst with ethereal HCl dramatically reduces the reaction times required for high conversions. A variety of alpha,beta-unsaturated carbonyl-containing substrates participate readily in cross and ring-closing metathesis reactions using this
Z-Selective Cross-Metathesis and Homodimerization of 3<i>E</i>-1,3-Dienes: Reaction Optimization, Computational Analysis, and Synthetic Applications
作者:Shao-Xiong Lennon Luo、Jeffrey S. Cannon、Buck L. H. Taylor、Keary M. Engle、K. N. Houk、Robert H. Grubbs
DOI:10.1021/jacs.6b08387
日期:2016.10.26
Olefin metathesis reactions with 3E-1,3-dienes using Z-selective cyclometalated ruthenium benzylidene catalysts are described. In particular, a procedure for employing 3E-1,3-dienes in Z-selective homodimerization and cross-metathesis with terminal alkenes is detailed. The reaction takes advantage of the pronounced chemoselectivity of a recently reported ruthenium-based catalyst containing a cyclometalated
描述了使用 Z 选择性环金属化亚苄基钌催化剂与 3E-1,3-二烯的烯烃复分解反应。特别是,详细介绍了在 Z 选择性同二聚化和与末端烯烃交叉复分解中使用 3E-1,3-二烯的过程。该反应利用了最近报道的钌基催化剂的显着化学选择性,该催化剂包含在内部 E-烯烃存在下用于末端烯烃的环金属化 NHC 配体。可以容忍各种常见的官能团,并且只需要少量过量 (1.5 当量) 的二烯偶联伙伴即可获得所需的内部 E,Z-二烯交叉复分解产物的高产率。已经进行了计算研究以阐明反应机理。计算与二烯优先途径一致。该反应可用于快速组装结构复杂的目标。两种昆虫信息素的简洁合成证明了这种交叉复分解反应的威力。
Remote Radical Trifluoromethylation: A Unified Approach to the Selective Synthesis of γ-Trifluoromethyl α,β-Unsaturated Carbonyl Compounds
作者:Marina Briand、Linh D. Thai、Flavien Bourdreux、Nicolas Vanthuyne、Xavier Moreau、Emmanuel Magnier、Elsa Anselmi、Guillaume Dagousset
DOI:10.1021/acs.orglett.2c03676
日期:2022.12.30
Site-selective trifluoromethylation of silyl dienol ethers derived from α,β-unsaturated aldehydes, ketones, and amides was achieved for the first time in the remote γ position. This photoredox catalyzed process is quite general to compounds bearing many functionalities and is applicable to the late-stage functionalization of biorelevant molecules. The use of S-perfluoroalkyl sulfoximines as ·RF radical
首次在远程 γ 位置实现了衍生自 α,β-不饱和醛、酮和酰胺的甲硅烷基二烯醇醚的位点选择性三氟甲基化。这种光氧化还原催化过程对于具有许多功能的化合物非常普遍,适用于生物相关分子的后期功能化。使用S-全氟烷基亚砜亚胺作为·R F自由基源可以将反应推广到其他全氟烷基(R F = CF 2 H,C 4 F 9)。重要的是,公开了一种前所未有的对映选择性 C(sp 3 )–H 全氟烷基化过程。
Au-Catalyzed Cyclization of Monoallylic Diols
作者:Aaron Aponick、Chuan-Ying Li、Berenger Biannic
DOI:10.1021/ol703002p
日期:2008.2.1
The Ph3PAuCl/AgOTf-catalyzed cyclization of monoallylic diols to form tetrahydropyrans is reported. The reactions proceed rapidly at temperatures as low as -78 degrees C with catalyst loadings as low as 0.1 mol % to provide the products in 79-99% yield. A broad range of structurally diverse substrates perform well in the reaction. When 2,6-disubstituted tetrahydropyrans are produced, the reaction is highly diastereoselective for the 2,6-cis product.