Copper-catalysed, diboron-mediated <i>cis</i>-dideuterated semihydrogenation of alkynes with heavy water
作者:Xiaowei Han、Jiefeng Hu、Cheng Chen、Yu Yuan、Zhuangzhi Shi
DOI:10.1039/c9cc03213d
日期:——
efficiently mediate the transfer of two D atoms from heavy water directly onto alkynes through copper-catalysed cis-selective semihydrogenation. Avoiding the use of costly and flammable D2 gas, this safe and practical process can proceed with excellent chemoselectivity and stereoselectivity. Utilizing the present method as the key step, the formal asymmetric total synthesis of d2-deuterium-labeled cis-combretastatin
将氘原子结合到有机分子中的方法对制药业来说很有价值。在这里,我们发现二硼试剂可以通过铜催化的顺式选择性半氢化作用有效地介导两个D原子从重水直接转移到炔烃上。避免使用昂贵且易燃的D 2气体,该安全实用的过程可以进行出色的化学选择性和立体选择性。使用本方法作为关键步骤,证明了d2-氘标记的顺式-combretastatin A4的形式不对称全合成。机理研究表明,炔烃的单硼化是该半氢化过程的关键步骤。