Rh(I)-Catalyzed Decarbonylation of Diynones via C–C Activation: Orthogonal Synthesis of Conjugated Diynes
摘要:
Utilization of C-C bond activation as a unique mode of reactivity for constructing C-C bonds provides new strategies for preparing important organic molecules. Development of a Rh(I)-catalyzed C-C activation of diynones to synthesize symmetrical and unsymmetrical conjugated diynes through decarbonylation is reported. This C-C cleavage strategy takes advantage of the innate reactivity of conjugated ynones without relying on any ring strain or auxiliary directing group. This alkynation method also has orthogonal properties compared to typical cross-coupling reactions.
Cross-coupling reactions of gold(I) alkynyl and polyyndiyl complexes
作者:Wing Y. Man、Sören Bock、Natasha N. Zaitseva、Michael I. Bruce、Paul J. Low
DOI:10.1016/j.jorganchem.2010.11.026
日期:2011.5
Gold(I) alkynylcomplexes are shown to efficiently couple with aryl iodides under mild conditions in the presence of both Pd(II) and Cu(I) co-catalysts. The reaction is not gold catalysed, but rather the Au(I) centre serves to transfer the alkynyl moiety to Cu(I), which then enters the conventional Sonogashira cycles. Using this method, a small range of 1,4-disubstituted diynes, including examples
已显示金(I)炔基络合物在钯(II)和铜(I)助催化剂的存在下,在温和条件下可与芳基碘化物有效偶联。该反应不是金催化的,而是Au(I)中心用于将炔基部分转移至Cu(I),然后进入常规的Sonogashira循环。使用这种方法,已经直接从[[(Ph 3 P)AuC CC CAu(PPh 3)]和碘化芳基ArI制备了少量的1,4-二取代的二炔,包括差异取代的化合物ArC CC CAr'的实例。
“Anti-Michael addition” of Grignard reagents to sulfonylacetylenes: synthesis of alkynes
作者:Francisco Esteban、Lazhar Boughani、José L. García Ruano、Alberto Fraile、José Alemán
DOI:10.1039/c7ob00783c
日期:——
In this work, the addition of Grignardreagents to arylsulfonylacetylenes, which undergoes an “anti-Michael addition”, resulting in their alkynylation under very mild conditions is described. The simplicity of the experimental procedure and the functional group tolerance are the main features of this methodology. This is an important advantage over the use of organolithium at −78 °C that we previously
An Efficient Heterogeneous Palladium(0)-Catalysed Cross-Coupling between 1-Bromoalkynes and Terminal Alkynes Leading to Unsymmetrical 1,3-Diynes
作者:Zhaotao Xu、Jinting Ai、Mingzhong Cai
DOI:10.3184/174751918x15208574638459
日期:2018.3
efficient heterogeneouspalladium(0)-catalysed cross-coupling of 1-bromoalkynes with terminal alkynes was achieved in DMF at room temperature in the presence of 5 mol% of MCM-41-immobilised bidentate phosphine palladium(0) complex [MCM-41-2P-Pd(0)] and 2 mol% of CuI with Et3N as base, yielding a variety of unsymmetrical 1,3-diynes in moderate to good yields. This heterogeneouspalladium(0) complex
Investigation of an Efficient Palladium-Catalyzed C(sp)−C(sp) Cross-Coupling Reaction Using Phosphine−Olefin Ligand: Application and Mechanistic Aspects
作者:Wei Shi、Yingdong Luo、Xiancai Luo、Lei Chao、Heng Zhang、Jian Wang、Aiwen Lei
DOI:10.1021/ja8049436
日期:2008.11.5
A pi-acceptor phosphine-electron-deficient olefin ligand was found effective in promoting Pd-catalyzed C(sp)-C(sp) cross-coupling reactions. The new protocol realized the cross-coupling of a broad scope of terminal alkynes and haloalkynes in good to excellent yields with high selectivities. Electron-rich alkynes, which are normally difficult substrates in Glaser couplings, could be employed as either