Three types of reactions between nitrile oxides and (I) endo and exo alkenes, (II) dimerized alkenes, and (III) single alkenes, in which all the alkenes were generated in situ by NaHSO4/SiO2 are presented. This procedure allowed the concomitant generation of both nitrile oxides and alkenes in a single reaction vessel, gave higher yields for the expected isoxazoline products than the conventional method
Palladium-catalysed carbonylative α-arylation of nitromethane
作者:Zhong Lian、Stig D. Friis、Troels Skrydstrup
DOI:10.1039/c5cc00123d
日期:——
A palladium-catalysed approach to α-nitroketonesviacarbonylative α-arylation of nitromethane is presented, thus providing easy access to key intermediates and important heterocycles.
通过钯催化的方法,通过对硝基甲烷进行羰基化的α芳基化,从而提供了对关键中间体和重要杂环的便捷访问。
α-Nitro Ketone Synthesis Using <i>N</i>-Acylbenzotriazoles
作者:Alan R. Katritzky、Ashraf A. A. Abdel-Fattah、Anna V. Gromova、Rachel Witek、Peter J. Steel
DOI:10.1021/jo051231x
日期:2005.11.1
Readily available N-acylbenzotriazoles 2a−l (derived from a variety of aliphatic, (hetero)aromatic, and N-protected α-amino carboxylic acids) smoothly convert primary 3a−c and α-functionalized primary nitroalkanes 3d into the corresponding α-nitro ketones 5a−p in yields of 39−86% (average 63%).
Iridium Diamine Catalyst for the Asymmetric Transfer Hydrogenation of Ketones
作者:Henar Vázquez-Villa、Stefan Reber、Martin A. Ariger、Erick M. Carreira
DOI:10.1002/anie.201102732
日期:2011.9.12
A simple and very efficient chiral aqua iridium(III) diamine complex leads to excellent enantioselectivities in the asymmetrictransferhydrogenation of various α‐cyano and α‐nitro ketones. The catalyst provides the ortho‐substituted aromatic alcohols with especially high ee values. The diamine ligands can be used directly as chiral ligands; conversion into the corresponding sulfamide is not necessary
gel-supported sodium hydrogen sulfate (NaHSO4/SiO2) or Amberlyst 15 as solid acid catalyst, and then the corresponding 3-acylisoxaszoles were obtained by reacting with alkynes via the 1,3-dipolar [3+2] cycloaddition. These heterogeneous catalysts are easily separable from the reaction mixture and reused. This synthetic method provides a facile, efficient, and reusable production of 3-acylisoxazoles.