4
Tetrahedron
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513.
thiomethylated product (from the reaction of aminopyrazole and
DMSO; Scheme 2).
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Conclusions
In summary, we have developed a route to synthesize C4-
dicarbonylated product of 5-aminopyrazole derivatives using a
combination of Cu(I)/Fe(III) salts. All the reagents and catalysts
are cheap and environmentally benign. Most importantly, aerial
oxygen acts as oxygenating agent. We have also proposed a
plausible mechanism for the reaction. Further investigation to
uncover this type of transformation is under progress in our
laboratory.
Acknowledgements
MLD is thankful to Science and Engineering Research Board
(SERB), India (Grant No. SB/FT/CS-073/2014) for the financial
support under “Fast Track” Scheme. PKB is also thankful to
SERB, India, (Grant No. SB/FT/CS-100/2012) for the financial
support. We acknowledge the Sophisticated Analytical
Instrumentation Facility (SAIF), GU, for use of the single crystal
X-ray diffractometer. The authors acknowledge Dr Ranjit
Thakuria, Dept. of Chemistry, Gauhati University for the X-ray
structure analysis.
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17. Wu, X.; Gao, Q.; Geng, X.; Zhang, J.; Wu, Y.; Wu, A. Org. Lett. 2016,
18, 2507.
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