Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 26, Issue 19, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.202300144
Keywords
ammonium acetate; cycloaddition; MCR; metal-free; 1; 5-benzodiazepines; 5-HMF
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The use of the renewable platform molecule 5-HMF in multi-component reaction with a diamine and an alkynone to generate seven-membered 1,5-benzodiazepines is described. Ammonium acetate in ethanol proved to be a clean and efficient system among catalysts/solvents couples. The optimized conditions were used to investigate the scope of the reaction providing a library of 1,5-benzodiazepines in moderate to good yields from a wide range of diversely substituted diamines and alkynones or alkyl alkynoates.
The use of the renewable platform molecule 5-hydroxymethylfurfural (5-HMF) in multi-component reaction with a diamine and an alkynone to generate seven-membered 1,5-benzodiazepines is described. Due to the sensitivity of 5-HMF to strong acidic and basic conditions, the investigation required an in-depth revisit of reaction parameters as compared to benchmark aldehydes. Among catalysts/solvents couples, ammonium acetate in ethanol proved to be a clean and efficient system. These optimized conditions were subsequently used to investigate the scope of the reaction providing a library of 1,5-benzodiazepines in moderate to good yields from a wide range of diversely substituted diamines and alkynones or alkyl alkynoates.
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