Coupling Reactions of Alkynylsilanes Mediated by a Cu(I) Salt: Novel Syntheses of Conjugate Diynes and Disubstituted Ethynes
作者:Yasushi Nishihara、Kazutaka Ikegashira、Kazunori Hirabayashi、Jun-ichi Ando、Atsunori Mori、Tamejiro Hiyama
DOI:10.1021/jo991686k
日期:2000.3.1
degrees C under an aerobic conditions smoothly undergoes homo-coupling to give the corresponding symmetrical 1,3-butadiynes in 70-99% yields. In addition, (arylethynyl)trimethylsilanes are found to couple with aryl triflates and chlorides in the presence of Cu(I)/Pd(0) (10 mol %/5 or 10 mol %) cocatalyst system to give the corresponding diarylethynes in 49-99% yields. The cross-coupling reaction is
1-三甲基甲硅烷基炔烃与氯化铜(I)在极性溶剂DMF中在有氧条件下于60摄氏度的反应顺利进行均相偶联,以70-99%的收率得到相应的对称1,3-丁二炔。此外,发现在(Cu)(I)/ Pd(0)(10 mol%/ 5或10 mol%)助催化剂体系存在下,(芳基乙炔基)三甲基硅烷会与芳基三氟甲磺酸酯和氯化物偶合,从而在49- 99%的产率。通过连续的Sonogashira-Hagihara,将交叉偶联反应应用于由(三甲基甲硅烷基)乙炔一锅合成相应的不对称二芳基乙炔,并且使用两种不同的芳基三氟甲磺酸酯进行本发明的交叉偶联反应。