Abstract
Depending on conditions, reaction of 3-amino-4H-chromeno[3,4-d]isoxazol-4-one with benzoyl chloride gives 4-hydroxy- and/or 4-benzoyloxy-3-(5-phenyl-1,2,4-oxadiazol-3-yl)coumarins, which are rearranged into 2-benzamido-4H-chromeno[3,4-d]oxazol-4-one by heating in DMSO.
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