Cyclisation of N-methoxy-N-acylnitrenium ions generated from N-methoxyamides of 6-methoxy-1,2,3,4-tetrahydroisoquinoline-1-acetic acids with a hypervalent iodine compound proceeds through a spirocyclic intermediate followed by ring expansion to form 1,5-benzodiazonine derivatives in good yield.
Y. Kikugawa and M. Kawase, J. Chem. Soc., Chem. Commun., 1991, 1354 DOI: 10.1039/C39910001354
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