Four-component coupling reactions of silylacetylenes, allyl carbonates, and trimethylsilyl azide catalyzed by a Pd(0)–Cu(I) bimetallic catalyst. Fully substituted triazole synthesis from seemingly internal alkynes
作者:Shin Kamijo、Tienan Jin、Yoshinori Yamamoto
DOI:10.1016/j.tetlet.2003.11.070
日期:2004.1
unactivated silylacetylenes, two equivalents of allyl carbonates, and trimethylsilyl azide in the presence of a Pd(0)–Cu(I) bimetallic catalyst. Various trisubstituted 1,2,3-triazoles were obtained in good yields. The reaction most probably proceeds through the [3+2] cycloaddition reaction between the alkynylcopper species and azide followed by the cross-coupling reaction between the vinylcopper intermediate
通过在Pd(0)-Cu(I)双金属催化剂存在下,未活化的甲硅烷基乙炔,两当量的碳酸烯丙酯和三甲基甲硅烷基叠氮化物的四组分偶联反应,可以合成完全取代的三唑。以良好的产率获得了各种三取代的1,2,3-三唑。该反应最有可能通过炔铜物种与叠氮化物之间的[3 + 2]环加成反应进行,然后是乙烯基铜中间体与π-烯丙基铝络合物之间的交叉偶联反应。