Abstract
Herein, we report a copper(I)-catalyzed ring expansion reaction of isoxazoles with 4-diazoisoquinolin-3-ones, furnishing a series of densely substituted novel spiro[isoquinoline-4,2'- [1,3]oxazin]-3-ones in good to excellent yields. Broad substrate scope, readily available starting materials, cheap catalyst, mild reaction conditions and scalability are the prominent features of this methodology.
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