Journal
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
Volume 44, Issue 4, Pages 1718-1725Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ejmech.2008.02.034
Keywords
Zileuton; Benzo[b]thiophene; Anti-inflammatory and analgesic
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An efficient method for trapping isocyanate 4, generated from the Curtius rearrangement, with ethyl alcohol to afford the carbamate 5 is reported. 5-Nitrobenzo[b]thiophene-2-carboxylic acid 1 is converted to the corresponding hydrazide 2 by the reaction with hydrazine hydrate and then to the azide 3 with nitrous acid, followed by thermal rearrangement, cooling, and trapping in one pot reaction. The carbamate 5 is treated with hydrazine hydrate to afford the desired, Zileuton analogue, 4-(5-nitrobenzo[b]thiophene-2-yl)semicarbazide 6. Also the reactivity of hydrazide 2 towards some carboxyaldehydes and phenylisothiocyanate afforded the corresponding carbohydrazides 7, 8 and phenylthiosemicarbazide 9, respectively. Compounds 9, 2 and 6, respectively, were more potent as anti-inflammatory and anti - noci ceptive agents. (c) 2008 Elsevier Masson SAS. All rights reserved.
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