Deprotonative Metalation of Chloro- and Bromopyridines Using Amido-Based Bimetallic Species and Regioselectivity-Computed CH Acidity Relationships
作者:Katia Snégaroff、Tan Tai Nguyen、Nada Marquise、Yury S. Halauko、Philip J. Harford、Thierry Roisnel、Vadim E. Matulis、Oleg A. Ivashkevich、Floris Chevallier、Andrew E. H. Wheatley、Philippe C. Gros、Florence Mongin
DOI:10.1002/chem.201101993
日期:2011.11.18
A series of chloro‐ and bromopyridines have been deprotometalated by using a range of 2,2,6,6‐tetramethylpiperidino‐based mixed lithium–metal combinations. Whereas lithium–zinc and lithium–cadmium bases afforded different mono‐ and diiodides after subsequent interception with iodine, complete regioselectivities were observed with the corresponding lithium–copper combination, as demonstrated by subsequent
通过使用一系列基于2,2,6,6-四甲基哌啶子基的混合锂金属组合,已将一系列氯吡啶和溴吡啶进行了脱金属处理。锂锌和锂镉碱在随后被碘截留后提供不同的一碘化物和二碘化物,而相应的锂铜组合则观察到了完全的区域选择性,随后通过苯甲酰氯的捕集证明了这一点。已经根据底物的CH酸来讨论了所获得的选择性,所述底物的CH酸是在气相中以及通过使用DFTB3LYP方法作为在THF中的溶液而确定的。