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A Tandem Strategy for the Synthesis of 1H-Benzo[g]indazoles and Naphtho[2,1-d]isoxazoles from o-Alkynylarene Chalcones
o-Alkynylarene chalcones when treated with hydrazines and hydroxylamine in the presence of iodine gave 1H-benzo[g]indazoles and naphtho[2,1-d]isoxazoles, respectively. The transformations involve tandem oxidative cyclocondensation/electrophilic hydroarylation. The methodology was applied to quinoline-based chalcones, which also afforded the corresponding quinoline-fused benzindazole and benzisoxazole.
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Reference:
Benzisoxazole – Wikipedia,
,Benzisoxazole – an overview | ScienceDirect Topics