A simple and efficient synthesis of novel N,N′-bis (1H-pyrrol-1-yl)-1-[2-(2-aryl-5-methyl-3-oxo-2,4-dihydro-3H-1,2,4-triazol-4-yl)ethyl]-1H-1,2,3-triazole-4,5-dicarboxamides

✍ Scribed by Prashant R. Latthe; Vinay A. Sunagar; Bharati V. Badami

• Publisher: Journal of Heterocyclic Chemistry
• Year: 2007
• Tongue: English
• Weight: 553 KB
• Volume: 44
• Category: Article
• ISSN: 0022-152X
• DOI: 10.1002/jhet.5570440620

✦ Synopsis

Abstract

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One‐pot reaction of 3‐aryl‐5‐methyl‐1,3,4‐oxadiazolin‐2‐ones 1a‐g with ethanolamine yielded the 4‐(2‐hydroxyethyl)‐2‐aryl‐5‐methyl‐2,4‐dihydro‐3__H__‐1,2,4‐triazolin‐3‐ones 2a‐g which were converted to the azido compounds 6a‐g. These azides on 1,3‐dipolar cycloaddition with DMAD afforded the dimethyl‐1‐[2‐(2‐aryl‐5‐methyl‐3‐oxo‐1,2,4‐triazol‐4‐yl)ethyl]‐1__H__‐1,2,3‐triazol‐4,5‐dicarboxylates 7a‐g which on conversion to bishydrazides 8a‐g and further cyclisation with 2,5‐hexanedione afforded the title compounds 9a‐g. This new short route for the so far unkown bis‐(triazolinone‐triazole)ethanes involves mild and convergent 1,3‐dipolar cycloaddition reaction yielding overall good yields of the products.