Highly Chemoselective Nickel-Catalyzed Three-Component Cross-Trimerization of Three Distinct Alkynes Leading to 1,3-Dien-5-ynes
作者:Kenichi Ogata、Jun Sugasawa、Shin-ichi Fukuzawa
DOI:10.1002/anie.200902099
日期:2009.8.3
Cross‐yned: The first highly chemoselective three‐component cross‐trimerization between a triisopropylsilylacetylene, an ether‐functionalized unsymmetrical internalalkyne, and a symmetrical internalalkyne leading to a 1,3‐dien‐5‐yne was achieved using a [Ni(cod)2]/PPh3 catalyst. This reaction is applicable for various internalalkynes with high regio‐ and stereoselectivities.
Cascade intramolecular imidoylation and C–H activation/annulation of benzimidoyl chlorides with alkynes: one-pot synthesis of 7<i>H</i>-dibenzo[<i>de</i>,<i>h</i>]quinoline analogues
作者:Jiao Liu、Hao Fang、Rui Cheng、Zhishuo Wang、Yudong Yang、Jingsong You
DOI:10.1039/c9cc03400e
日期:——
Reported herein is a cascade Lewis acid-promoted intramolecular Friedel–Crafts-type imidoylation and Rh(III)-catalyzed C–H activation/annulation of benzimidoyl chlorides and alkynes, providing a general and concise one-pot approach to 7H-dibenzo[de,h]quinoline analogues. This divergent approach is based on a convergent retrosynthetic disconnection strategy.
Copper(0) nanoparticle catalyzed
<i>Z</i>
‐Selective Transfer Semihydrogenation of Internal Alkynes
作者:Maria Jesus Moran、Katia Martina、Vidmantas Bieliunas、Francesca Baricco、Silvia Tagliapietra、Gloria Berlier、Wim M. De Borggraeve、Giancarlo Cravotto
DOI:10.1002/adsc.202100126
日期:2021.6.8
The use of copper(0) nanoparticles in the transfer semihydrogenation of alkynes has been investigated as a lead-free alternative to Lindlar catalysts. A stereo-selective methodology for the hydrogenation of internal alkynes to the corresponding (Z)-alkenes in high isolated yields (86% average) has been developed. This green and sustainable transfer hydrogenation protocol relies on non-noble copper
Regio-and stereo-specific reduction of conjugated and non-conjugated triple bonds by activated zinc powder
作者:Marc H. P. J. Aerssens、Lambert Brandsma
DOI:10.1039/c39840000735
日期:——
Regio-as well as stereo-specificreductions of a wide variety of acetylenic derivatives have been carried out in absolute ethanol with zincpowderactivated with 1,2-dibromoethane, and with zincpowderactivated successively with dibromoethane and copper(I) bromide, the first reagent less powerful and more selective than the second one.
Etude du comportement d'organometalliques (M = Zn, Mg, Li) vis a vis d'enynes conjuges
作者:D. Mesnard、L. Miginiac
DOI:10.1016/s0022-328x(00)87262-9
日期:1976.9
organometallic compounds such as allyl-zinc, -magnesium, -lithium and saturated lithium compounds are shown to readily undergo addition reactions with conjugated enynes: HCCC(R)C(R)(R), but the reactivity is reduced when the steric hindrance around the double bond is increased. With each organometallic compound used, this reaction is regioselective: 3,4 addition with organozinc compounds, 1,2 addition