Synthesis of 2, 3-dihydro-4 (1H)-quinolones and the corresponding 4 (1H)-quinolones via low-temperature Fries rearrangement of N-arylazetidin-2-ones

~%

~50%

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~82%

~98%

~92%

~98%

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~85%

~88%

~95%

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~38%

~94%

~95%

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~66%

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~97%

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