A Catalytic Cross‐Olefination of Diazo Compounds with Sulfoxonium Ylides
作者:James D. Neuhaus、Adriano Bauer、Alexandre Pinto、Nuno Maulide
DOI:10.1002/anie.201809934
日期:2018.12.3
A ruthenium‐catalysed cross‐olefination of diazo compounds and sulfoxonium ylides is presented. Our reaction design exploits the intrinsic difference in reactivity of diazo compounds and sulfoxonium ylides as both carbene precursors and nucleophiles, which results in a highly selective reaction.
The reaction of alkyl 4-hydroxy-2-alkynoates and 4-hydroxy-2-alkyn-1-ones with palladium tributylammonium formate and with tributylamine: Preparation of 1,4-dicarbonyl compounds
作者:A. Arcadi、S. Cacchi、F. Marinelli、D. Misiti
DOI:10.1016/s0040-4039(00)80324-x
日期:1988.1
Ethyl 4-oxo-2-alkenoates and 1,4-dioxo-2-alkenes are easily prepared by treating ethyl 4-hydroxy-2-alkynoates and 4-hydroxy-2-alkyn-1-ones with n-tributylamine. Treatment of ethyl 4-hydroxy-2-alkynoates and 4-hydroxy-2-alkyn-1-ones with palladium-tributylammonium formate produces ethyl 4-oxo-alkanoates and 1,4-alkandiones in good to high yield through a novel one-pot isomerization/hydrogenation reaction
Catalytic Conjugate Addition of Indoles to 4-Aryl-4-oxobut-2-enoates by FeCl<sub>3</sub>
作者:Xiaoxia Wang、Yaohong Zhang、Xiaohui Xiao、Xinsheng Li
DOI:10.1246/cl.2008.1284
日期:2008.12.5
The conjugate addition of indoles to 4-aryl-4-oxobut-2-enoates was achieved with FeCl3 as a catalyst under mild conditions. The reaction was highly regioselective and afforded a variety of new 3-substituted indoles in good to excellent yields.
Catalytic Reactions of Carbene Precursors on Bulk Gold Metal
作者:Yibo Zhou、Brian G. Trewyn、Robert J. Angelici、L. Keith Woo
DOI:10.1021/ja900653s
日期:2009.8.26
Bulk gold metal powder, consisting of particles (5-50 microm) much larger than nanoparticles, catalyzes the coupling of carbenes generated from diazoalkanes (R(2)C=N(2)) and 3,3-diphenylcyclopropene (DPCP) to form olefins. It also catalyzes cyclopropanationreactions of these carbeneprecursors with styrenes. The catalytic activity of the gold powder depends on the nature of the gold particles, as
散装金金属粉末,由比纳米粒子大得多的粒子 (5-50 微米) 组成,催化重氮烷烃 (R(2)C=N(2)) 和 3,3-二苯基环丙烯 (DPCP) 产生的卡宾的耦合形成烯烃。它还催化这些卡宾前体与苯乙烯的环丙烷化反应。金粉的催化活性取决于金颗粒的性质,这由 TEM 和 SEM 研究确定。可以从涉及生成卡宾 R(2)C:吸附在金表面上的中间体的机制来理解这些反应。
Photoisomerization of 3-benzoylacrylates on a silica gel surface: Effect of reaction environment on selectivity
On irradiation on a dry silica gel surface, 2-(N, N-dialkylamino)ethyl 3-benzoylacrylates undergo selective E-Z isomerization. Competing processes, such as remote-hydrogen abstraction via a charge-transfer state, with the photoisomerization in solution are completely suppressed on the surface. The yield of the Z - from the E- isomer increases with increase in the coverage of the E-isomer on the surface