发现Pd [(s)-3-C 3 H 5 -4-(C 5 H 5 CH 2)-1-(2,6- i Pr 2 C 6 H 3)-C 3 H 3 N 2 ](C 5 H 5 N)Br 2衍生自l-苯丙氨酸是有氧条件下短时间内反应的炔烃无铜和无膦的Sonogashira反应的有效预催化剂。此外,钯化合物将被再利用以催化由Sonogashira反应制得的炔烃的加氢芳基化,这首先使Sonogashira /加氢芳基化顺序反应成功。炔的芳基化具有高的区域和立体选择性,并且仅观察到炔的反芳基化。没有ž / Ë在系统中观察到烯烃的异构化。
Hydroarylation of aryl-substituted alkynes with simple and substituted arenes was conducted in the presence of trifluoroacetic acid in dichloromethane without any metal catalysts or additives. Electron-rich arenes coupled with aryl-substituted alkynes to give 1,1-diarylalkenes in good to high yields.
Synthesis of 1,1-diaryl ethylenes by Cu-catalyzed arene C–H addition to aryl acetylenes
作者:Sachin V. Bhilare、Nitin B. Darvatkar、Amol R. Deorukhkar、Dilip G. Raut、Girish K. Trivedi、Manikrao M. Salunkhe
DOI:10.1016/j.tetlet.2008.12.031
日期:2009.2
An unprecedented copper-catalyzed C–H addition of arenes to aryl acetylenes provides a facile route to 1,1-diaryl ethylenes in moderate to excellent yields. Arylboronic acids were likewise used along with aryl acetylenes in generating 1,1-diaryl ethylene.
Hydroarylation of propiolic acids with various arenes in TFA proceeded efficiently in the presence of FeCl3/AgOTf catalyst system. In the case of electron-rich arenes, the iron-catalyzed hydroarylation gave cinnamic acids in moderate to high yields. The hydroarylation of phenylacetylene was observed but the catalyst was not effective under the same conditions. (C) 2010 Elsevier B.V. All rights reserved.