The new [5.7.4]tricyclic ring system 3 is synthesized in a one-pot reaction from bis(iminophosphorane)1 and two equivalents of aryl isocyanate; compound 1 also reacts with one equivalent of isocyanate to give the bicyclic [1,3]diazepine 6; the crystal structure of compounds 3 and 6 are determined.
P. Molina, A. Arques, A. Alías, M. C. Foces-Foces and A. L. Llamas-Saiz, J. Chem. Soc., Chem. Commun., 1992, 424 DOI: 10.1039/C39920000424
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