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Intramolecular Nitrilimine Cycloadditions leading to the Pyrazolo[1,5-a][6,1]benzoxazonine and Pyrazolo[1,5-a][7,1]benzoxazecine Skeletons
1  Dipartimento di Chimica Organica e Industriale dell'Universit√†, via Golgi 19, 20133 Milano, Italy

Abstract: Intramolecular 1,3-dipolar cycloadditions represent a valuable tool in the synthesis of a large variety of heterocyclic systems containing a five- membered heterocycle fused or bridged to another hetero- or carbo-cyclic ring.1 However, despite to the usefulness of this methodology, the examples in which is implied the formation of a medium-sized ring are still rare.2,3
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