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The effective and unprecedented chiral BINOL phosphoric acid catalyzed (1–10 mol %) dearomatization of indoles through electrophilic activation of allenamides (ee up to 94 %), is documented. Besides the synthesis of 3,3‐disubstituted indolenine cores, a dearomatization/hydrogen transfer cascade sequence is also presented as a new synthetic shortcut toward highly enantiomerically enriched indolines.
Controlling reaction selectivity is an eternal pursuit for chemists working in chemical synthesis. As part of this endeavor, our group has been exploring the possibility of constructing different natural product skeletons from the same simple starting materials by using different catalytic systems. In our previous work, an isoflavanone skeleton was obtained from the annulation of a salicylaldehyde...
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