Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2014, Issue 15, Pages 3082-3086Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201402021
Keywords
Bromine; Cyclization; Hydrazones; Nitrogen heterocycles; Synthetic methods
Categories
Funding
- National Natural Science Foundation of China [21272087, 21202053, 21232003]
- National Basic Research Program of China (973 program) [2011CB808603]
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An efficient halocyclization of ,-unsaturated hydrazones with N-bromosuccinimide was developed without the addition of any additives under mild reaction conditions to provide facile access to biologically important 4,5-dihydropyrazoles. Under the optimized conditions, a variety of highly substituted 4,5-dihydropyrazole derivatives were obtained in generally good yields. Moreover, this reaction can be further applied to the synthesis of pyrazoles in a one-pot fashion.
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