Preparation of <i>N</i>-Aryl Amides by Epimerization-Free Umpolung Amide Synthesis
作者:Michael S. Crocker、Zihang Deng、Jeffrey N. Johnston
DOI:10.1021/jacs.2c05986
日期:2022.9.21
enantioselective synthesis. However, its inability to forge N-aryl amides has been a longstanding problem, one limiting its application more broadly in drug development where α-chiral N-aryl amides are increasingly common. We report here the reaction of α-fluoronitroalkanes and N-aryl hydroxyl amines for the direct synthesis of N-aryl amides using a simple Brønsted base as the promoter. No other activating
Heterocyclic<i>N</i>-Acetoxyarylamines, Models for the Putative Ultimate Carcinogens of Aromatic Amines: 2-Acetoxyamino-5-phenylpyridine and 2-Acetoxyaminopyridine
作者:W. H. Ojala、R. A. Iyer、P. E. Hanna、W. B. Gleason
DOI:10.1107/s0108270196015168
日期:1997.5.15
The structures of O-acetyl-N-(5-phenyl-2-pyridyl)-hydroxylamine, C13H12N2O2, (I), and O-acetyl-N-(2-pyridyl)hydroxylamine, C7H8N2O2, (II), have been determined in order to confirm earlier structure assignments based on spectroscopic information. Compound (I) is the probable mutagenic metabolite of the phenylalanine pyrolysis product 2-amino-5-phenyl-pyridine, The crystal structures of (I) and (II) are the first reported for heterocyclic N-acetoxyarylamines, the corresponding homocyclic arylamine derivatives being extremely unstable. In the solid state, both (I) and (II) exist as hydrogen-bended dimers, with the arylamine N atom acting as donor and the pyridine N atom of a neighboring inversion-related molecule as acceptor; the distance between donor and acceptor N atoms is 3.007(2) in (I) and 2.956(2) Angstrom in (II). This orientation of the N-H bond results in the rotation of the acetoxy group out of the plane of the pyridine ring by 22.5(2) in (I) and 27.4(2)degrees in (II).
Sulfapyridine-1-oxides
作者:SCOTT J. CHILDRESS、JOHN V. SCUDI
DOI:10.1021/jo01095a020
日期:1958.1
Newbold; Spring, Journal of the Chemical Society, 1949, p. Spl. 133
作者:Newbold、Spring
DOI:——
日期:——
Preparation and Properties of Some New Chelating Agents<sup>1</sup>