Journal
ORGANIC LETTERS
Volume 22, Issue 23, Pages 9249-9252Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.0c03465
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Funding
- JSPS KAKENHI [JP18K06590, JP19K23815, JP19K05467]
- Hoansha Foundation
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A Bronsted acid-mediated synthesis of pyrazoles from conjugated hydrazones through a beta-protonation/nucleophilic addition/cyclization/aromatization sequence was developed. This protocol utilizing the ambiphilic reactivity of hydrazones enables not only self-condensation but also cross-condensation, affording multisubstituted pyrazoles in high yields, with a broad substrate scope. This sequential reaction proceeds under mild conditions via a simple operation. Moreover, the method can be applied to the synthesis of a nonsteroidal anti-inflammatory drug, Lonazolac.
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