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A new p-TsOH-promoted dehydroxylated [3+2] cyclization strategy has been established, allowing a flexible, practical and regiospecific approach to 23 examples of 1,5,6,7-tetrahydro-4H-indol-4-ones from low-cost and readily accessible β-hydroxy ketones and cyclic enaminones. Notably features of this work include broad functional group compatibility, mild reaction conditions and good reaction yields.
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