Title:Water Extract of Onion Catalyst: A Sustainable Approach for the Synthesis
of 4-Substituted 1,5-Benzodiazepine Derivatives via an In Situ Generated
Enaminones
Volume: 11
Issue: 3
Author(s): Loganathan Selvaraj, Rajendran Eswaran, Vennila Kailasam Natesan and Seenivasa Perumal Muthu*
Affiliation:
- Department of Chemistry, Gandhigram Rural Institute-Deemed to be University, Gandhigram. Dindigul district, Tamilnadu,
624302. India
Keywords:
Green catalyst; 1, 2-diamine, enaminone, benzodiazepines, water extract of onion, functional groups.
Abstract:
Background: A simple, convenient and environmentally benign green protocol has been
developed for the one-pot synthesis of 4-substituted-1,5-benzodiazepines through three-component
reaction of 1,2-diamine, 1,3-cyclic diketone with an aldehyde catalyzed by water extract of onion.
The reaction conditions were optimized and the scope of the reaction was extended to various 1,2-
diamines, 1,3-cyclic diketones and aldehydes. The main advantages of this method are good to
excellent yields, easy workup, simple experimental procedure, and an ability to tolerate a variety of
functional groups which gives cost-effective as well as green rewards. The structure of compound
5f was confirmed by single crystal X-ray analysis.
Objective: A methodology developed for the synthesizing of 4-substituted 1,5-Benzodiazepine derivatives
via enaminones intermediates using 1,2-diamine, 1,3-cyclic diketone and aldehyde in environmentally
friendly ethanol as medium.
Methods: As a more environmentally friendly catalyst for producing products containing benzodiazepines
using aqueous extract of onion. The devised method was proven reliable, non-toxic and
greener solvent with quick work-up to produce the intended product.
Results: Here, using a one-pot, three-component reaction with a dimedone, 1,2-diamine and range
of aldehyde while using water extract of onion as a catalyst. The acquired experimental results
showed that the employed synthesis methodology is a straightforward procedure that offers various
benefits, including sustainability, easy separtion from the reaction medium.
Conclusion: We have developed a sustainble approach for synthesizing benzodiazepine from radily
available precursors under mild reaction conditions.