Directed lithiations: the effect of varying directing group orientation on competitive efficiencies for a series of tertiary amide, secondary amide, and alkoxide directed ortho lithiations
作者:Peter Beak、Shawn T. Kerrick、Donald J. Gallagher
DOI:10.1021/ja00076a022
日期:1993.11.1
Significant differences for competitive efficiencies in directed ortho lithiations for single functional groups in three series, the secondary benzamides 1-4, the tertiary benzamides 5-11, and the benzylic alcohols 12-17, are reported. For both amide series the efficiencies increase as the oxygen and ortho hydrogen in the substrate are more coplanar with the aromatic ring; however, for the alcohol
报告了三个系列中单个官能团的定向邻位锂化的竞争效率的显着差异,即仲苯甲酰胺 1-4、叔苯甲酰胺 5-11 和苯甲醇 12-17。对于两个酰胺系列,随着底物中的氧和邻氢与芳环更共面,效率增加;然而,对于酒精系列,观察到相反的顺序。为这些观察提供了合理化