Site-selective sequential coupling reactions controlled by “Electrochemical Reaction Site Switching”: a straightforward approach to 1,4-bis(diaryl)buta-1,3-diynes
Selectivity of aryl iodo over ethynyl iodo toward the Suzuki cross couplingreaction is explored by utilizing a palladium complex of amino‐etherheteroditopicmacrobicycle. Subsequently, unreacted ethynyl iodide undergoes homocoupling reaction in the same catalytic atmosphere, thereby representing a cascadedualC−Ccouplingreaction. Furthermore, this approach is extended for novel one‐pot synthesis
Site-selective sequential coupling reactions controlled by “Electrochemical Reaction Site Switching”: a straightforward approach to 1,4-bis(diaryl)buta-1,3-diynes
作者:Koichi Mitsudo、Natsuyo Kamimoto、Hiroki Murakami、Hiroki Mandai、Atsushi Wakamiya、Yasujiro Murata、Seiji Suga
DOI:10.1039/c2ob26567b
日期:——
Site-selective sequential coupling reactions directed toward bis(diaryl)butadiynes are described. The reaction site could be controlled completely by the on/off application of electricity. The electro-oxidative homo-coupling of terminal alkynes (electricity ON) and the subsequent SuzukiâMiyaura coupling (electricity OFF) afforded bis(diaryl)butadiynes in high yields. The obtained 1,4-bis(diaryl)butadiynes could be converted to a 2,5-bis(diaryl)thiophene derivative, which exhibited blue fluorescence.