Toluene-p-sulphonyl azide gives cyclic amidines with 2-methyl-1-piperideine and 2,5-dimethyl-1-pyrroline. The products are rationalised on the basis of an imine–enamine equilibrium in the starting azomethines.
A. C. Ritchie and M. Rosenberger, J. Chem. Soc. C, 1968, 227 DOI: 10.1039/J39680000227
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