An Alternative Role for Acetylenes: Activation of Fluorobenzenes toward Nucleophilic Aromatic Substitution
作者:Nicholas P. Bizier、Jay Wm. Wackerly、Eric D. Braunstein、Mengfei Zhang、Stephen T. Nodder、Stephen M. Carlin、Jeffrey L. Katz
DOI:10.1021/jo400668v
日期:2013.6.21
aspect of arylacetylene reactivity by utilizing alkynes as electron-withdrawing groups (EWG) for promoting nucleophilic aromatic substitution (SNAr) reactions. Reaction rates for the substitution of 4-(fluoroethynyl)benzenes by p-cresol were determined by 1H NMR spectroscopy, and these rate data were used to determine substituent (Hammett) constants for terminal and substituted ethynyl groups. The synthetic
乙炔是越来越多用途的官能团,可用于各种复杂性构建有机转化和所需分子结构的构建。在此我们通过利用炔烃作为促进亲核芳族取代(S吸电子基团(EWG)公开了芳基乙炔的反应性的先前被低估方面Ñ AR)的反应。反应速率为4的取代-(fluoroethynyl)由苯p甲酚通过确定1个H NMR光谱,并且这些速率数据被用于确定用于终端和取代的乙炔基的取代(哈米特)常数。乙炔活化S N的合成范围氩气反应范围广;带有一个或两个乙炔基的氟代芳烃被各种氧和芳基胺亲核试剂高产取代。