With a system consisting of a catalytic zinc Lewis acid, pyridine, and TEMPO in a nitrile medium, terminalalkynes coupled with HSnBu3, providing alkynylstannanes with structural diversity. The resulting alkynylstannane, without being isolated, could be directly used for Pd‐ and Cu‐catalyzed transformations to deliver internal alkynes and more intricate tin‐atom‐containing molecules. Mechanistic studies
Metal-dependent regioselective homocoupling of stannyl- and alkyl-substituted alkynes on group 4 elements. Formation of unsymmetrical titanacyclopentadienes and symmetrical zircona-cyclopentadienes
Homocoupling of stannyl- and alkyl-substituted alkynes with Cp2TiBu2 gave unsymmetrical titanacyclopentadienes (αβ isomers) with >95% regioselectivities, whereas the coupling with Cp2ZrBu2 provided symmetrical zirconacyclopentadienes (αα isomers) with >93% selectivities. This is the first example of metal-dependent regioselective homocoupling of unsymmetrical alkynes on group 4 elements.
A Highly Efficient and Recyclable Pd(Pph<sub>3</sub>)<sub>4</sub>/Peg-400 System for Stille Cross-Coupling Reactions of Organostannanes with Aryl Bromides
作者:Xue Huang、Fang Yao、Ting Wei、Mingzhong Cai
DOI:10.3184/174751917x15045169836226
日期:2017.9
Pd(PPh3)4 in PEG-400 is shown to be a highly efficient catalyst for the Stille cross-coupling reactions of various organotin compounds with arylbromides. The reaction could be conducted at 80 °C using NaOAc as base, yielding a variety of biaryls, alkynes and alkenes in good to excellent yields. The isolation of the products was readily performed by extraction with petroleum ether and the Pd(PPh3)4/PEG-400
A Practical Synthesis of Biaryls and Aromatic Acetylenes by Stille Coupling in Room-Temperature Ionic Liquids
作者:Wenyan Hao、Zhiwen Xi、Mingzhong Cai
DOI:10.1080/00397911.2011.558233
日期:2012.8.15
cross-coupling reactions of aryl halides with aryl or alkynylstannanes have been achieved under mild conditions in 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]), affording the corresponding biaryls and aromatic acetylenes in good yields. Use of this solvent allows for facile recycling of the solvent and catalyst system, which can be used at least five times without loss of activity. GRAPHICAL
MCM-41-supported bidentate phosphine palladium(0) complex as an efficient catalyst for the heterogeneous Stille reaction
作者:Hong Zhao、Yue Wang、Junchao Sha、Shouri Sheng、Mingzhong Cai
DOI:10.1016/j.tet.2008.05.120
日期:2008.8
Stille coupling reaction of organostannanes with organic halides has been developed in the presence of a catalytic amount of MCM-41-supportedbidentatephosphine palladium(0) complex (0.5 mol %) in DMF/H2O (9:1) under air atmosphere in high yields. This polymeric palladium catalyst exhibits higher activity than Pd(PPh3)4 and can be reused at least 10 times without any decrease in activity.
在空气中DMF / H 2 O(9:1)中催化量的MCM-41负载的双齿膦膦钯(0)络合物(0.5 mol%)的存在下,开发了有机锡与有机卤化物的Stille偶联反应。高产的气氛。该聚合钯催化剂显示出比Pd(PPh 3)4更高的活性,并且可以重复使用至少10次而活性没有降低。