La 反应 est 适用一个 une variete de composes carbonyles insatures destructures different tels que, cetones aromatiques, cetones acetyleniques, cetones ethyleniques et aldehydes。L'utilite est illustree par la synthese fortement Stereocontrolee d'intermediaires de prostaglandines, de quelques pheromones d'insectes, d'alcools terpeniques primaires chiraux, de phenyloxiranne optiquement actif...
Gold-Catalyzed Highly Regioselective Oxidation of C−C Triple Bonds without Acid Additives: Propargyl Moieties as Masked α,β-Unsaturated Carbonyls
作者:Biao Lu、Chaoqun Li、Liming Zhang
DOI:10.1021/ja1072614
日期:2010.10.13
Gold-catalyzed intermolecular oxidations of internal alkynes have been achieved with high regioselectivities using 8-alkylquinoline N-oxides as oxidants and in the absence of acid additives. Synthetically versatile α,β-unsaturated carbonyls are obtained in good to excellent yields and with excellent E-selectivities. A range of functional groups such as THP, MOMO, N(3), OTBS, and N-Boc are tolerated
使用 8-烷基喹啉 N-氧化物作为氧化剂并且在没有酸添加剂的情况下,已经以高区域选择性实现了内部炔烃的金催化分子间氧化。合成通用的 α,β-不饱和羰基化合物以良好到极好的收率和极好的 E 选择性获得。可以容忍一系列功能组,例如 THP、MOMO、N(3)、OTBS 和 N-Boc。该反应允许 α,β-不饱和羰基被掩蔽为炔丙基部分,从而为复杂结构合成中可能遇到的这些官能团的相容性问题提供了实用的解决方案。
Synthesis of Silyloxyvinylstannanes from BHT Ester Enolates and Stannyllithium Reagents. Copper(I)-Mediated Coupling with Alkenyl Halides
作者:Asunción Barbero、Francisco J. Pulido
DOI:10.1055/s-2001-14590
日期:——
The synthesis of silyloxyvinylstannanes was achieved via reaction of BHT ester enolates with tributylstannyllithium and trapping of the resulting enolates with phenyldimethylchlorosilane. They were coupled with alkenyl iodides through a Cu(I)-mediated reaction to generate silyl dienol ethers which were readily transformed into α,β-unsaturated ketones.
β-Halovinyl ketones: Synthesis from acetylenic ketones
作者:Mikio Taniguchi、Shozo Kobayashi、Masako Nakagawa、Tohru Hino、Yoshito Kishi
DOI:10.1016/s0040-4039(00)85059-5
日期:1986.1
of terminal acetylenicketones with NaI or LiBr gave almost exclusively E-β-iodo- or E-β-bromovinyl ketones in trifluoroacetic acid, while Z-β-iodo- or Z-β-bromovinyl ketones were the major products in acetic acid. Trimethylsilyl iodide and bromide reacted smoothly with acetylenicketones at −78°C to give TMS-allenolates which were readily converted to β-iodo- and β-bromovinyl ketones, respectively
A novel route to 1,3-dienyl-2-boronic esters providing simple syntheses of conjugated [E,E]-dienes and conjugated [E]-alkenones.
作者:Herbert C. Brown、Narayan G. Bhat、Ramakrishnan R. Iyer
DOI:10.1016/s0040-4039(00)79758-9
日期:1991.7
highly stereo- and regioselective synthesis of [E]-2-(1′-[E]-alkenylsubstituted-1′-alkenyl)-l,3,2-dioxaborinanes has been achieved for the first time via the nucleophilic substitution of [Z]-(1-bromo-1- alkenyl)boronic esters with [E]-l-lithio-l-alkenes. These are novel boron intermediates, which are converted into conjugated [E,E]-dienes and conjugated [E]-alkenones in good yields and in excellent stereochemical
[ E ] -2-(1'-[ E ]-烯基取代的-1'-烯基)-1,3,2-二氧杂硼烷酮的高度立体和区域选择性合成是通过[ Z ]-(1-溴-1-烯基)硼酸酯与[ E ] -1-锂硫基-1-烯烃。这些是新颖的硼中间体,可以高收率和出色的立体化学纯度将其转化为共轭[ E,E ]-二烯和共轭[ E ]-烯酮。
Efficient and Selective Hydroacylation of 1-Alkynes with Aldehydes by a Chelation-Assisted Catalytic System This work was supported by the National Research Laboratory Program (2000-N-NL-01-C-271) administered by the Ministry of Science and Technology.