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
Synthesis of Carbamoyl Fluorides Using a Difluorophosgene Surrogate Derived from Difluorocarbene and Pyridine <i>N</i>-Oxides
作者:Dusty Cadwallader、Tristan R. Tiburcio、George A. Cieszynski、Christine M. Le
DOI:10.1021/acs.joc.2c01017
日期:2022.9.2
We report a method for the synthesis of carbamoylfluorides from secondary amines using bench-stable, inexpensive, and readily accessible starting materials that, when combined, yield a surrogate for toxic difluorophosgene (COF2) gas. In contrast to state-of-the-art methods for the synthesis of carbamoylfluorides, our protocol does not require the use of pre-functionalized substrates, the preparation
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。