Abstract
The 1,3-dipolar cycloaddition of nitrilimine, generated in situ from N′-phenylbenzohydrazonoyl chloride and triethylamine, to 7-arylmethylidene-6,7-dihydroindolizin-8( 5H)-one afforded novel 4′-aryl-2′,5′-diphenyl-2′,4′,5,6-tetrahydro-8 H-spiro(indolazine-7,3′-pyrazol)-8-ones in moderate yields. The structures of all the products were characterised thoroughly by NMR, infrared spectroscopy and HRMS. The structure and stereochemistry was confirmed by X-ray diffraction analysis.
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