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- [26] Synthesis of indole substituted dihydro- and tetrahydro-isoxazoles via 1,3-dipolar cycloadditions of C-(1-methylindol-2-yl)-N-methylnitrone with unsaturated carbonyl derivatives and a study of their acid-induced intramolecular cyclizations JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, 1997, (06): : 949 - 957