Reaction of quinolines fluorinated at the benzene ring with nitrogen-centered nucleophiles
作者:L. Yu. Safina、G. A. Selivanova、I. Yu. Bagryanskaya、V. D. Shteingarts
DOI:10.1007/s11172-009-0134-z
日期:2009.5
contains three or four halogen atoms, their combined orientation effect outweighs the influence of the heterocycle N atom. It was found that the orientation of substitution in the reactions of 5,6,8-trifluoro- and 5,7,8-trifluoro-6-(trifluoromethyl)quinolines with piperidine depends on temperature, because the enthalpy control of the ratio of the rates of competing reactions changes to the entropy control
在苯环(5,7-二氟-、5,7,8-三氟-、5,6,8-三氟-、8-氯-5,7-二氟-、5,6 ,7,8-四氟-和 5,7,8-三氟-6-(三氟甲基)喹啉)与以氮为中心的亲核试剂(氨水和液氨、水合肼、哌啶)反应进行了研究。如果氟化喹啉分子含有三个或四个卤素原子,它们的组合取向效应超过杂环N原子的影响。发现 5,6,8-trifluoro- 和 5,7,8-trifluoro-6-(trifluoromethyl)quinolines 与哌啶的反应中的取代取向取决于温度,因为控制的焓控制了 5,6,8-trifluoro- 和 5,7,8-trifluoro-6-(trifluoromethyl)quinolines 与哌啶的反应。竞争反应的速率改变了熵控制。