May 2012
N2O4 Chemisorbed onto n-Propylsilica Kryptofix 21 and Kriptofix 22 as Two New
599
Functional Polymers for the Fast Oxidation of Urazoles and 1,4-Dihydropyridines
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In conclusion, n-propylsilica kryptofix 21 or kriptofix
22-supported N2O4 (V or VI) are two new safe and easy-handling
N2O4–polymer-supported reagents. They can act as unique power-
ful system for the fast oxidation of urazoles and dihydropyridines
under heterogeneous, metal free, and mild conditions via in situ
generation of NO+ without water. Reaction procedure offer advan-
tages such as simple work-up, very low reaction times, good to
excellent yields, and matching with green chemistry protocols.
Acknowledgments. The authors acknowledged financial support
for this work from the research affairs of Hamedan University of
Medical Sciences (Hamedan, Iran) and partial support of this
work by the Research Affairs Office of Bu-Ali Sina University
(Grant number 32-1716 entitled development of chemical
methods, reagent and molecules) and also Center of Excellence in
Development of Chemical Method (CEDCM; Hamedan, I.R. Iran).
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Journal of Heterocyclic Chemistry
DOI 10.1002/jhet