Cyclization of heterosubstituted w-azidodienes 11 provides fused bicyclic 3-pyrrolines 12 in one operation.These pyrrolines are potentially useful intermediates for natural products synthesis, as illustrated by further functionalization.Ring system 1 is well represented as a structural subfeature in many alkaloids.An attractive strategy for the assembly of such systems would be an intramolecular 1,4-nitrene/diene cycloaddition, providing bicyclic 3-pyrrolines 2 (eq. 1). We wish to report herein a one-pot equivalent of this cycloaddition (see 3 =1 5 in Scheme 1).
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