Palladium‐Catalyzed Pyrazole‐Directed sp
<sup>3</sup>
C−H Bond Arylation for the Synthesis of β‐Phenethylamines
作者:Nurbey Gulia、Olafs Daugulis
DOI:10.1002/anie.201611407
日期:2017.3.20
have developed a method for palladium‐catalyzed, pyrazole‐directed sp3 C−H bond arylation by aryl iodides. The reaction employs a Pd(OAc)2 catalyst at 5–10 mol % loading and silver(I) oxide as a halide‐removal agent, and it proceeds in acetic acid or acetic acid/hexafluoroisopropanol solvent. Ozonolysis of the pyrazole moiety affords pharmaceutically important β‐phenethylamines.
Direct Preparation of <i>N</i>-Substituted Pyrazoles from Primary Aliphatic or Aromatic Amines
作者:Nurbey Gulia、Marcin Małecki、Sławomir Szafert
DOI:10.1021/acs.joc.1c00606
日期:2021.7.16
procedures for pyrazoles known today, those directly employing primary amines as substrates are rare. Herein, we report an original method for the preparation of N-alkyl and N-aryl pyrazoles from primary aliphatic or aromatic amines as a limiting reagent of the reaction. The protocol utilizes no inorganic reagents and requires a short reaction time, mild conditions, and the use of structurally simple and
Synthesis and reactivity of new l-(1-adamantyl)pyrazoles
作者:P. Cabildo、R. M. Claramunt、J. Elguero
DOI:10.1002/jhet.5570210149
日期:1984.1
Using 1-adamantylhydrazine as starting material, a series of 1-(1-adamantyl)pyrazoles has been prepared. Electrophilic reactivity (bromination and nitration) and nucleophilic reactivity (quaternarization) have been studied. Proton nuclear magnetic resonance spectra of all the new compounds are recorded.