An advantageous synthesis of 5-substituted 1H-tetrazoles has been developed by treatment of organic nitriles with NaN 3 in the presence of iodine or the heterogeneous catalyst, silicasupported sodium hydrogen sulfate (NaHSO 4 ·SiO 2 ).

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An efficient and mild one-pot, gold-catalyzed intramolecular cyclization of N-propargylic β-enaminones has been achieved for the generation of 1,4-oxazepine derivatives. This synthetic transformation tolerates a range of substituted N-propargylic β-enaminones in moderate to good yields.

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