New In Situ Trapping Metalations of Functionalized Arenes and Heteroarenes with TMPLi in the Presence of ZnCl<sub>2</sub>and Other Metal Salts
作者:Annette Frischmuth、Maitane Fernández、Nadja M. Barl、Florian Achrainer、Hendrik Zipse、Guillaume Berionni、Herbert Mayr、Konstantin Karaghiosoff、Paul Knochel
DOI:10.1002/anie.201403688
日期:2014.7.21
afford functionalized organometallic compounds of Mg, Zn, or Cu. This in situ trapping method allows an expedited metalation (−78 °C, 5 min) of a range of sensitive pyridines (bearing a nitro, ester, or cyano group) and allows the preparation of kinetic regioisomers of functionalized aromatic compounds or heterocycles not otherwise available by standard metalating agents, such as TMPMgCl⋅LiCl or TMPZnCl⋅LiCl
在-78°C下将TMPLi添加到芳族或杂芳族底物与金属盐(例如MgCl 2,ZnCl 2或CuCN)的混合物中,首先导致芳烃的锂化,然后用金属盐进行金属转移以提供官能化的有机金属Mg,Zn或Cu的化合物。这种原位俘获方法可以加快一系列敏感吡啶(带有硝基,酯或氰基)的金属化(-78°C,5分钟),并可以制备功能化芳族化合物或杂环的动态区域异构体可通过标准金属化剂(如TMPMgCl·LiCl或TMPZnCl·LiCl)获得。