Synthesis, computational studies, antimycobacterial and antibacterial properties of pyrazinoic acid–isoniazid hybrid conjugates
作者:Siva S. Panda、Adel S. Girgis、Bibhuti B. Mishra、Mohamed Elagawany、Venkatasai Devarapalli、William F. Littlefield、Ahmed Samir、Walid Fayad、Nehmedo G. Fawzy、Aladdin M. Srour、Riham M. Bokhtia
DOI:10.1039/c9ra03380g
日期:——
Benzotriazole and microwave mediated syntheses led to a new set of hybrid conjugates of pyrazinoic acid with isoniazid via aminoacid linkers in excellent yields with retention of chirality. Microbiological screening of the synthesized conjugates revealed an exceptionally high activity against some of the pathogenic bacterial strains at low concentrations. Promising antimycobacterial properties were
An Environmentally Benign Electrochemical
Process for the Reduction of Carboxylic Acid Hydrazides to Amides
作者:Rolf Breinbauer、Matthias Mentel、Matthias Beier
DOI:10.1055/s-0028-1088164
日期:——
The transformation of acidhydrazides to primary amides is of certain relevance for the organic synthesis of complex molecules. While existing methods require harsh reaction conditions, we present an electrochemical approach in which monoacylhydrazines are reduced to primary amides in 40-90% yield in a divided electrochemical cell with a tin cathode. This method proved superior to reduction by sodium/mercury
Hypervalent Iodine Oxidation of Acid Hydrazides: A New Synthesis of<i>N,N</i>′-Diacylhydrazines
作者:Om Prakash、Vijay Sharma、Anil Sadana
DOI:10.1080/00397919708005637
日期:1997.10
Abstract Hypervalent iodine oxidation of p-substituted benzohydrazides (1a-h), phenylacetohydrazide (1i) and heterocyclic acid hydrazides (1j-I) using one equivalent of iodobenzene diacetate in dry dichloromethane or acetonitrile leads to dimerization thereby providing a new and facile method for the synthesis of N,N-diacylhydrazines 2.
Migration of an acyl group in the pyrazole system: synthesis of 1-acyl-3-hydroxy-1H-pyrazoles and related derivatives. A new preparation of N,N ′-diacylhydrazines
from 4-ethoxymethylene-2-phenyloxazol-5(4H)-one (1) and hydrazides, 4-phenylsemicarbazide, 4-phenylthiosemicarbazide and benzyl carbazate in boiling dioxane is described. The method includes a migration of an acyl or related unit. The X-ray study and NMR spectroscopic examination confirmed the structure of the products. A one-pot synthesis of N,N′-diacylhydrazines from hydrazides by the assistance of
Iron(II) ions are shown to induce a hitherto unknown nitrogen-centred metathesis (‘hydrazine metathesis’) of pyridoxal isonicotinoylhydrazone dimethiodide (1) into the symmetrical hydrazine derivatives pyridoxal azine dimethiodide (7) and dimethiodide of bis-isonicotinoyl hydrazide (8) together with isonicotinoylamide methiodide (9) in a ratio 2 : 1 : 1, respectively.