Selectivity in the Ruthenium-Catalyzed Alder Ene Reactions of Di- and Triynes
作者:Eun Jin Cho、Daesung Lee
DOI:10.1021/ja0719430
日期:2007.5.1
Ruthenium-catalyzed Alder enereactions between diynes and triynes with terminal alkenes gave the corresponding enynes and enediynes with high regio- and site-selectivity. The selectivity profile clearly indicates that one of the alkynyl moieties of 1,3-diynes not participating in the reaction determines the regiochemistry, whereas the interplay between steric hindrance and polar substituents at the
Cross and Ring-Closing Metathesis of 1,3-Diynes: Metallotropic [1,3]-Shift of Ruthenium Carbenes
作者:Mansuk Kim、Reagan L. Miller、Daesung Lee
DOI:10.1021/ja054875v
日期:2005.9.1
The regio- and stereoselective enyne CM and RCM reactions involving 1,3-diynes have been developed. The ring-closingmetathesis of enediynes induces a facile metallotropic [1,3]-shift of alkynyl rutheniumcarbene species, thereby providing a unique entry into the synthesis of fully conjugated 1,5-diene-3-ynes.
已经开发了涉及 1,3-二炔的区域选择性和立体选择性烯炔 CM 和 RCM 反应。烯二炔的闭环复分解导致炔基钌卡宾物质的易金属化[1,3]-移位,从而为完全共轭的1,5-二烯-3-炔的合成提供独特的入口。
Bulky Trialkylsilyl Acetylenes in the Cadiot−Chodkiewicz Cross-Coupling Reaction
作者:Joseph P. Marino、Hanh Nho Nguyen
DOI:10.1021/jo025745x
日期:2002.9.1
tert-butyldimethylsilyl (TBS), and triisopropylsilyl (TIPS) acetylenes underwent the Cadiot-Chodkiewicz cross-coupling reaction with different bromoalkynes to form a variety of synthetically useful unsymmetrical diynes in good yields. The diyne alcohol 10 was transformed regio- and stereoselectively into enynes by hydrotelluration, carbometalation, and reduction reactions.
Palladium-Catalyzed Dimerization of Conjugated Diynes: Synthesis of (<i>E</i>)-1,2-Divinyldiethynylethenes Having Donor and Acceptor Chromophores at the Terminus of Alkyne
作者:Nirmal K. Pahadi、Draxel H. Camacho、Itaru Nakamura、Yoshinori Yamamoto
DOI:10.1021/jo052262v
日期:2006.2.1
es (DVDEEs) having donor and acceptor chromophores at the terminals of alkyne unit 7‘ were synthesized by the palladium/HOAc-catalyzed dimerization of the conjugated diynes 8 bearing an Si group at the terminus of alkyne (R1 position), followed by desilylation and subsequent Sonogashira reaction of the resulting terminal alkyne 10 with aryl iodides.
(E)-1,2-二乙烯基二乙炔基(DVDEEs)在炔烃单元7 '的末端具有供体和受体发色团,是通过钯/ HOAc催化的在炔烃末端带有Si基团的共轭二炔8的二聚共轭二炔8的二聚作用合成的( R 1位置),然后进行甲硅烷基化和随后的最终炔烃10与芳基碘化物的Sonogashira反应。