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An efficient and facile green method for synthesis of four substituted 1,5-benzodiazepine derivatives via a three-component reaction of dimedone,  o -phenyl diamine, and various substituted aldehydes are designed using β-cyclodextrin as a catalyst at reflux condition. The current one-pot multicomponent methodology offers several advantages, such as good to excellent yields, simplicity in experimental procedure, easy work-up procedure, shorter reaction time, energy-conserving, broad substrate scope, avoidance of hazardous chemicals, etc. Further, the catalyst was recovered and recycled 4–5 times without compromising the yield of the final product.

β-cyclodextrin: Green catalyst for the efficient and expeditious synthesis of benzodiazepines under aqueous conditions