conditions. When this reaction was applied to dithiocarbamates ArN(R)CS2Me at higher temperatures, the trifluoromethylation was accompanied by halogen substitution at the p-position of the Ar group. The synthesis of trifluoromethyl-substituted adenosine is also described.
三氟甲胺很容易从二硫代氨基甲酸酯通过由四丁基二氢三氟化铵和 N-卤代酰亚胺组成的试剂系统在温和条件下合成。当该反应在较高温度下应用于二硫代氨基甲酸酯 ArN(R)CS2Me 时,三氟甲基化伴随着 Ar 基团对位的卤素取代。还描述了三氟甲基取代的腺苷的合成。
Reaction of Thiocarbonyl Fluoride Generated from Difluorocarbene with Amines
作者:Jiao Yu、Jin-Hong Lin、Ji-Chang Xiao
DOI:10.1002/anie.201710186
日期:2017.12.22
The reaction of thiocarbonyl fluoride, generated from difluorocarbene, with various amines under mild conditions is described. Secondary amines, primary amines, and o‐phenylenediamines are converted to thiocarbamoyl fluorides, isothiocyanates, and difluoromethylthiolated heterocycles, respectively. Thiocarbamoyl fluorides were further transformed into trifluoromethylated amines by using a one‐pot process
Reported herein is the one‐pot synthesis of trifluoromethylated amines at room temperature using the bench‐stable (Me4N)SCF3 reagent and AgF. The method is rapid, operationally simple and highly selective. It proceeds via a formal umpolung reaction of the SCF3 with the amine, giving quantitative formation of thiocarbamoyl fluoride intermediates within minutes that can readily be transformed to N‐CF3
One-pot synthesis of trifluoromethyl amines and perfluoroalkyl amines with CF<sub>3</sub>SO<sub>2</sub>Na and R<sub>f</sub>SO<sub>2</sub>Na
作者:Shuaishuai Liang、Jingjing Wei、Lvqi Jiang、Jie Liu、Yasir Mumtaz、Wenbin Yi
DOI:10.1039/c9cc03282g
日期:——
A newly developed CF3SO2Na-based trifluoromethylation of secondary amines has been disclosed, and the method has been successfully extended to the configuration of perfluoroalkyl amines using RfSO2Na, complementing the established synthesis strategy of trifluoromethyl amines. Advantages of the method include good functional group tolerance, mild conditions, and inexpensive or easy-to-handle materials
已经公开了新开发的基于仲胺的基于CF 3 SO 2 Na的三氟甲基化,并且该方法已经成功地扩展到使用R f SO 2 Na的全氟烷基胺的构型,补充了已建立的三氟甲基胺的合成策略。该方法的优点包括良好的官能团耐受性,温和的条件以及廉价或易于处理的材料。机理探针表明,原位形成的硫代羰基氟化物是反应中的关键中间体。
Determination of the Hammett Acidity of HF/Base Reagents
Harnessing the acidity of HF/base reagents is of paramount importance to improve the efficiency and selectivity of fluorination reactions. Yet, no general method has been reported to evaluate their acidic properties, and experimental designs are still relying on a trial-and-error approach. We report a new method based on 19F NMR spectroscopy which allows highly sensitive measures and short-time analyses
利用 HF/碱试剂的酸性对于提高氟化反应的效率和选择性至关重要。然而,尚未报道评估其酸性特性的通用方法,并且实验设计仍然依赖于试错法。我们报告了一种基于19 F NMR 光谱的新方法,可实现高灵敏度测量和短时间分析。有利的是,指标的基本属性可以通过DFT计算在上游确定,从而提供简单而稳健的半经验方法。特别是,本研究中使用的指标经过合理设计,符合概念上吸引人且常用的哈米特量表。该方法已应用于市售和最近开发的 HF/碱试剂。