Scheme 1.
Cycloaddition of diphenylnitrilimine to coumarin. Reagents and conditions. (a) diphenylnitrilimine (DPNI), benzene, TEA, compound 2, 65% yield, compound 5, 65% yield; (b) lead tetraacetate, dichloromethane, r.t., 12 h, 83% yield.
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