The Journal of Organic Chemistry

Oxidative cyclization of arylhydrazones of chalcones and benzalacetones to pyrazoles by thianthrene cation radical

AC Kovelesky, HJ Shine

Index: Kovelesky, Albert C.; Shine, Henry J. Journal of Organic Chemistry, 1988 , vol. 53, # 9 p. 1973 - 1979

Full Text: HTML

Citation Number: 25

Abstract

Phenyl-,@-nitropheny1)-, and (2, 4-dinitrophenyl) hydrazones of chalcone (benzalacetophenone), benzalacetone, and of some of their derivatives undergo oxidative cyclization in reactions with thianthrene cation radical perchlorate. The products are, respectively, 1, 3, 5-triaryl-(3) and 3-methyl-l, 5-diarylpyrazoles (4) and are formed in excellent yields. Cyclization appears to occur by way of the arylhydrazone cation radical ...

Related Articles:

A Novel Synthesis of fluorinated pyrazoles via Gold (I)-catalyzed tandem aminofluorination of alkynes in the presence of selectfluor

[Qian, Jianqiang; Liu, Yunkui; Zhu, Jie; Jiang, Bo; Xu, Zhenyuan Organic Letters, 2011 , vol. 13, # 16 p. 4220 - 4223]

Cross-coupling of 1-aryl-5-bromopyrazoles: regioselective synthesis of 3, 5-disubstituted 1-arylpyrazoles

[Wang, Xiao-Jun; Tan, Jonathan; Grozinger, Karl Tetrahedron Letters, 2000 , vol. 41, # 24 p. 4713 - 4716]

Cross-coupling of 1-aryl-5-bromopyrazoles: regioselective synthesis of 3, 5-disubstituted 1-arylpyrazoles

[Wang, Xiao-Jun; Tan, Jonathan; Grozinger, Karl Tetrahedron Letters, 2000 , vol. 41, # 24 p. 4713 - 4716]

Cross-coupling of 1-aryl-5-bromopyrazoles: regioselective synthesis of 3, 5-disubstituted 1-arylpyrazoles

[Wang, Xiao-Jun; Tan, Jonathan; Grozinger, Karl Tetrahedron Letters, 2000 , vol. 41, # 24 p. 4713 - 4716]

More Articles...