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
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。
Visible-Light-Induced DDQ-Catalyzed Fluorocarbamoylation Using CF<sub>3</sub>SO<sub>2</sub>Na and Oxygen
作者:Huijeong Cho、Seonga Jang、Kangjoo Lee、Dohoon Cha、Sun-Joon Min
DOI:10.1021/acs.orglett.3c03335
日期:2023.12.8
carbamoyl fluorides via visible-light induced DDQ catalysis of secondary amines is described. This protocol employs sodium trifluorosulfinate and molecular oxygen for the in situ generation of carbonyldifluoride, which is reacted with amines to afford the corresponding carbamoyl fluorides efficiently. Moreover, carbamoyl fluorides are easily transformed to synthetically useful carbonyl compounds under
practical one-pot preparation of carbamoyl fluorides from easily obtained pyridineN-oxide, commercially available secondary amines and synthetically versatile difluorocarbene precursors (Ruppert-Prakash reagent or Chen's reagent) was developed herein, which dexterously resorted to the oxidation of difluorocarbene by external pyridineN-oxide to produce the toxic and gaseous fluorophosgene in situ. Notable
eFluorination for the Rapid Synthesis of Carbamoyl Fluorides from Oxamic Acids
作者:Feba Pulikkottil、John S. Burnett、Jérémy Saiter、Charles A. I. Goodall、Bini Claringbold、Kevin Lam
DOI:10.1021/acs.orglett.4c01605
日期:2024.7.26
In this letter, we disclose the anodic oxidation of oxamic acids in the presence of Et3N·3HF as a practical, scalable, and robust method to rapidly access carbamoyl fluorides from readily available and stable precursors. The simplicity of this method also led us to develop the first flow electrochemical preparation of carbamoyl fluorides, demonstrating scale-up feasibility as a proof of concept.
在这封信中,我们公开了在 Et 3 N·3HF 存在下草酰胺酸的阳极氧化,作为一种实用、可扩展且稳健的方法,可从容易获得且稳定的前体中快速获得氨基甲酰氟。这种方法的简单性也促使我们开发了第一个氨基甲酰氟的流动电化学制备方法,证明了放大的可行性作为概念证明。