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Direct synthesis of pyrazoles from esters using tert-butoxide-assisted C-(C=O) coupling

Authors
Kim, Bo RamSung, Gi HyeonRyu, Ki EunLee, Sang-GyeongYoon, Hyo JaeShin, Dong-SooYoon, Yong-Jin
Issue Date
2015
Publisher
ROYAL SOC CHEMISTRY
Citation
CHEMICAL COMMUNICATIONS, v.51, no.44, pp.9201 - 9204
Indexed
SCIE
SCOPUS
Journal Title
CHEMICAL COMMUNICATIONS
Volume
51
Number
44
Start Page
9201
End Page
9204
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/96168
DOI
10.1039/c5cc02020d
ISSN
1359-7345
Abstract
This paper describes the direct synthesis of pyrazoles from esters that comprises two sequential reactions: tert-butoxide-assisted C-C(=O) coupling reaction to yield beta-ketonitrile or alpha,beta-alkynone intermediates, and condensation by hydrazine addition. The method reported allows for easy control of the regioselectivity and structure of substituents at N-1, C-3, C-4 and/or C-5 positions.
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