Palladium-catalyzed, unsymmetrical homocoupling of thiophenes via carbon–sulfur bond activation: a new avenue to homocoupling reactions
作者:Amir Hossein Vahabi、Abdolali Alizadeh、Hamid Reza Khavasi、Ayoob Bazgir
DOI:10.1039/c7ob01923h
日期:——
carbonyl group in amino thiophene offers a new class of synthetic protocols for C–N cross-coupling with arylboronic acids. The bidentate N,O-chelation provides a series of advantages such as copper-catalyzed, ligand- and base-free under open-flask conditions. Interestingly, the combination of the C–N cross-coupling/homocoupling reactions in a domino fashion led to the bithiophene adducts featuring
描述了通过空前的均偶联反应,Pd催化的,CN定向的2,4'-联噻吩的不对称合成。NH 2 / CN / SMe布置中断了例程。通过结合底物的亲电和亲核基序,噻吩中官能团的协同性能将为金属催化均偶联反应领域开辟新的视野。此外,发现氨基噻吩中羰基的α-螯合作用为C–N与芳基硼酸的交叉偶联提供了新的一类合成方法。二齿N,O螯合提供了一系列优势,例如在开瓶条件下铜催化,无配体和无碱。有趣的是,C-N交叉偶联/均偶联反应以多米诺骨牌的方式相结合,导致联噻吩加合物的特征是氮在两个噻吩单元之间桥接了C(Ar)-N键断裂。