Zakrzewski J, Jezierska J, Hupko J. 4-Isocyano-2,2,6,6-tetramethylpiperidin- 1-oxyl: A Valuable Precursor for the Synthesis of New Nitroxides.
Org Lett 2004;
6:695-7. [PMID:
14986952 DOI:
10.1021/ol036298q]
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Abstract
To enrich the limited set of isonitriles typically employed, 4-isocyano-2,2,6,6-teramethylpiperidin-1-oxyl (1) is proposed as an isonitrile bearing a nitroxyl moiety. Isocyanide 1 was used in some reactions characteristic of isonitriles. Isoselenocyanate, amides (products of Passerini and Ugi reactions), and tetrazole derivative were obtained. The EPR spectra of the urea derivative 5b and a product of an Ugi reaction 7 (both dinitroxides) were analyzed. [structure: see text]
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