Styryl coupling vs. styryl acetate formation in reactions of styryl tellurides with palladium(II) salts
摘要:
In sharp contrast to the expected formation of a telluride-palladium complex, the treatment of either (E,E)- and (Z,Z)-distyryl tellurides (1 and 2) or (E)- and (Z)-styryl phenyl tellurides (5 and 6) with Li2PdCl4 in acetonitrile at 25-degrees-C results in the formation of stereoisomeric 1,4-diphenylbuta-1,3-dienes, whereas the treatment of 1 and 2 with Pd(OAc)2 produces styryl acetates solely or mainly.
Preparation of symmetrical divinyl tellurides via an ylidation reaction
作者:Claudio C Silveira、Gelson Perin、Paula Boeck、Antonio L Braga、Nicola Petragnani
DOI:10.1016/s0022-328x(99)00090-x
日期:1999.7
Symmetrical divinyl tellurides are prepared by sequential reaction of bis-(triphenylmethyl phosphonium) halotellurate with base or by the reaction of triphenylmethylidene phosphoranes with TeCl4, followed by aldehydes. The products are converted to E-α,β-unsaturated aldehydes by treatment with n-BuLi and DMF.
Abstract A new method of Sonogashira coupling reactions between diorganyl tellurides and terminal alkynes is reported. The coupling reactions are performed using Pd(dppf)Cl2 as a catalyst, CuI as a co-catalyst in the presence of K2CO3 in DMSO. The reactions are carried out at room temperature and completed within 2 h when phenyl acetylene is used as a terminal alkyne. For aliphatic terminal alkynes
Stereoselective Synthesis of (Z)-Enynes via Pd(II)/CuI(I)-Catalyzed Cross-Coupling Reaction of bis-Vinylic Tellurides with 1-Alkynes
作者:Gilson Zeni、Paulo H. Menezes、Angélica Venturini Moro、Antonio L. Braga、Claudio C. Silveira、Hélio A. Stefani
DOI:10.1055/s-2001-16799
日期:——
(Z)-bis-Vinylic tellurides undergo direct coupling reaction with terminal alkynes in the presence of palladium (II) at room temperature to give (Z)-enyne systems in good yields.
Carbon-carbon bond forming reactions via Pd-catalyzed detellurative homocoupling of diorganyl tellurides
作者:Shaozhong Zhang、Lalitha Kolluru、Souseelya K. Vedula、Drew Whippie、Jin Jin
DOI:10.1016/j.tetlet.2017.07.087
日期:2017.9
method for the constructions of Csp-Csp, Csp2-Csp2 and Csp3-Csp3 bonds is reported. The symmetrical diaryl tellurides undergo detellurative homocouplings to afford symmetrical biaryl products. The reactions are carried out at ambient temperature using PdCl2 as a catalyst in the presence of Ag2O and Na2CO3. Similarly, the detellurative homocouplings of dibenzyl telluride and bis(phenylethynyl)telluride
Vinyllithiums from butyl-vinyl tellurides and bis-vinyl tellurides
作者:Simone M. Barros、João V. Comasseto、Jorge Berriel
DOI:10.1016/s0040-4039(00)70695-2
日期:1989.1
Butyl vinyl tellurides and bis-vinyl tellurides furnish vinyllithiums with retention of configuration in good yields upon treatment with n-butyllithium at −78°C.