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.
Tertiaryanilines can be prompted to react with N-aryl- and N-benzylmaleimides to form tetrahydroquinoline products under photocatalysis using visiblelight irradiation, the ruthenium or iridium complexes Ru(bpy)3Cl2 or Ir(ppy)2(dtbbpy)PF6 as catalyst, and air as terminal oxidant.
TBAI-Catalyzed S–H and N–H Insertion Reactions of α-Diazoesters with Thiophenols and Amines under Metal-Free Conditions
作者:Rongxiang Chen、Guoyang Ma、Yawen Li、Jinju Zhang、Ran Xia、Kai-Kai Wang、Lantao Liu
DOI:10.1021/acs.joc.2c01262
日期:2022.8.19
Mild, convenient, and effective TBAI-catalyzed S–H and N–H insertion reactions of α-diazoesters with thiophenols and aromatic aminesunder metal-free conditions have been described, furnishing a straightforward and general platform for the synthesis of various thioethers and 2-amino-2-oxoacetates in moderate to excellent yields. Moreover, this strategy features simple operation, mild conditions, broad
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。
An Efficient Synthesis of α,α-Diallyl Carbinols from Esters Activated with Amides via an In-Mediated Barbier Type Allylation