Isolation and structural characterization of a titanacyclopropane as key intermediate in the double aryl Grignard addition to 2-(arylethynyl)pyridine derivatives
作者:Francesco Foschi、Torsten Roth、Markus Enders、Hubert Wadepohl、Eric Clot、Lutz H. Gade
DOI:10.1039/c8cc00478a
日期:——
A titanacyclopropane species, which is a key reaction intermediate in the Ti(OiPr)4-mediated double aryl Grignard addition to 1,2-di(pyridin-2-yl)ethyne and related alkynes, was isolated and fully characterized. Based on this observation a one-pot synthesis of diarylated 1,2-di(pyridin-2-yl)ethanes and 2-(1,2,2-triarylvinyl)-pyridines was developed, including the tetraarylation of V-shaped 2,6-bis
分离并充分表征了钛环丙烷物种,该物种是Ti(OiPr)4介导的双芳基格利雅(Grignard)除1,2-二(吡啶-2-基)乙炔和相关炔烃中的关键反应中间体。基于该观察结果,开发了一锅合成的二芳基化1,2-二(吡啶-2-基)乙烷和2-(1,2,2-三芳基乙烯基)-吡啶,包括V型2的四芳基化。 6-双(芳基乙炔基)吡啶。