Herein, a transfer hydrogenation of in situ generated imine intermediates from readily available isatin‐hydrazones with 1,4‐benzoquinones or aldehydes by Brønsted acid catalysis was established. This efficient, mild ambient, operationally simple and safe approach afforded stereospecific functionalized isatin‐3‐arylhydrazones and isatin‐3‐alkylhydrazones in excellent yields (up to 95%).
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Shi et al. (2025) studied this question.
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