通过一系列铁催化光氧化还原从草酰胺酸生成氨基甲酰自由基、将氨基甲酰自由基添加到缺电子烯烃、分子内环化、和芳构化。该工艺与多种N-苯基肟酸和单取代、1,1-二取代和三取代的缺电子烯烃相容。该方案采用廉价、易得且环境友好的铁作为催化剂,为 3,4-二氢喹啉-2(1 H )-酮的合成提供了一种极好的替代方案。
Room-Temperature Decarboxylative Couplings of α-Oxocarboxylates with Aryl Halides by Merging Photoredox with Palladium Catalysis
作者:Wan-Min Cheng、Rui Shang、Hai-Zhu Yu、Yao Fu
DOI:10.1002/chem.201502286
日期:2015.9.14
Enabled by merging iridium photoredoxcatalysis and palladiumcatalysis, α‐oxocarboxylate salts can be decarboxylatively coupled with arylhalides to generate aromatic ketones and amides at room temperature. DFT calculations suggest that this reaction proceeds through a Pd0–PdII–PdIII pathway, in which the PdIII intermediate is responsible for reoxidizing IrII to complete the IrIII–*IrIII–IrII photoredox
通过合并铱的光氧化还原催化和钯催化,α-氧代羧酸盐可以与芳基卤化物脱羧偶联,在室温下生成芳族酮和酰胺。DFT计算表明,该反应通过Pd 0 -Pd II -Pd III途径进行,其中Pd III中间体负责重新氧化Ir II以完成Ir III- * Ir III -Ir II光氧化还原循环。
Cycloaddition in synthesis of sulfonamide derivatives. II. Synthesis of N-arylsulfonylethoxalamides by cycloaddition of arylsulfonyl isocyanates to ethyl oxamates.
作者:Hiroto TAMURA、Tsuneo IWAKAWA、Yoshio HAYASE
DOI:10.1248/cpb.38.1069
日期:——
A new class of sulfonamides, N2-arylsulfonyl-N1, N1-disubstituted ethoxalamidines, was synthesized by reaction of arylsulfonyl isocyanates with N, N-disubstituted ethyl oxamates. It was suggested that the reacion might proceed through [2+2] cycloaddition of the isocyanates to an amide carbonyl moiety with high selectivity.
Synthesis of 2,3-allenylamides utilizing [1,2]-phospha-Brook rearrangement and their application to gold-catalyzed cycloisomerization providing 2-aminofuran derivatives
An efficient synthetic method for 2,3-allenylamides having an oxygen functionality at the 2-position, which are difficult to access by conventional methods, was newly developed by utilizing the [1,2]-phospha-Brook rearrangement under...
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。
Petjunin; Schklajaew, Zhurnal Obshchei Khimii, 1957, vol. 27, p. 731,733; engl. Ausg. S. 805