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A heterocyclic system (6) containing a beta-carboline moiety is described. o-Nitrophenylpyruvic acid and tryptamine hydrochloride were condensed to give 1-(2′-nitrobenzyl)-1,2,3,4-tetrahydro-beta-carboline (3). 3, on dehydrogenation, gave 1-(2′-nitrobenzyl)-beta-carboline (4) which was treated with methanolic KOH to furnish 1-(3′,2′,1′-benzisoxazole)-beta-carboline (5) which on thermolysis or photolysis afforded the indolocinnoline derivative (6).
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Reference:
Benzisoxazole – Wikipedia,
,Benzisoxazole – an overview | ScienceDirect Topics