Reaction of various 3-aryl- and 3-heteroaryl-4-bromosydnones with piperidine gives the corresponding piperidino-glycyl-piperidines. Fluorine labelling has confirmed the postulated course of fission induced by acids in 3-aryl-sydnoneimines.
G. S. Puranik and H. Suschitzky, J. Chem. Soc. C, 1967, 1006 DOI: 10.1039/J39670001006
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