Facile Access to AgOCF<sub>3</sub>and Its New Applications as a Reservoir for OCF<sub>2</sub>for the Direct Synthesis of N−CF<sub>3</sub>, Aryl or Alkyl Carbamoyl Fluorides
showcase its performance in trifluoromethoxylations or as reservoir for O=CF2. This enabled the direct, practical and safe synthesis of valuable N‐alkyl/aryl and N−CF3 carbamoyl fluorides from secondary amines and isothiocyanides, respectively. Our mechanistic data indicate that AgOCF3 does not liberate O=CF2 until it is activated by a nucleophilic co‐reagent, reinforcing the stability of the salt under
Direct Synthesis of Carbamoyl Fluorides by CO
<sub>2</sub>
Deoxyfluorination
作者:Killian Onida、Anis Tlili
DOI:10.1002/anie.201907354
日期:2019.9.2
Herein, a new concept for the direct synthesis of carbamoyl fluoride derivatives is disclosed. The developed method makes use of CO2 as an inexpensive and abundant C1 source; a variety of amines were successfully converted in the presence of a deoxyfluorinating reagent. The corresponding products were often obtained in excellent yields under mild reaction conditions (1 atm and room temperature). The
Concise and Additive‐Free Click Reactions between Amines and CF<sub>3</sub>SO<sub>3</sub>CF<sub>3</sub>
作者:Hai‐Xia Song、Zhou‐Zhou Han、Cheng‐Pan Zhang
DOI:10.1002/chem.201901865
日期:2019.8.14
The reactions are rapid, efficient, selective, and versatile, and can be performed in benign solvents, giving products in excellent yields with minimal efforts for purification. The characteristics of the reactions meet the requirements of a click reaction. The use of trifluoromethyl trifluoromethanesulfonate as a click reagent is advantageous over other "CO" sources (e.g., TsOCF3 , PhCO2 CF3 , CsOCF3
Carbamoyl fluorides are formed in reactions of hydroxylamines with difluorocarbene generated from sodium bromodifluoroacetate as readily available and non‐toxic carbene precursor. The process shows a high functional group tolerance, and the reaction path has been rationalized by computational calculations.
A new reagent has been designed through 2-electron activation of SF6 with commercially available tetrakis(dimethylamino)ethylene (TDAE) under blue LED irradiation. The versatility of this new SF5-based reagent has been demonstrated for the deoxyfluorination of CO2 and the fluorinative desulfurization of CS2 affording useful fluorinated amines. Moreover, SF5Cl could be generated under mild conditions
一种新的试剂通过在蓝色 LED 照射下用市售的四(二甲氨基)乙烯 (TDAE)对 SF 6进行 2 电子活化而设计。这种新型 SF 5基试剂的多功能性已被证明可用于 CO 2的脱氧氟化和 CS 2的氟化脱硫,从而提供有用的氟化胺。此外,SF 5 Cl 可以在温和的条件下由试剂I生成,允许烯烃和炔烃的氯代五氟硫烷基化。