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A Cu-catalyzed Sommelet-Hauser dearomatization of dihydrophenanthridine and diazo compounds is reported for the synthesis of spiro-indolines. A spiro-structure with adjacent quaternary and tertiary carbon centers was constructed in one step as a single isomer. Increasing steric hindrance by introducing ortho -substituents dramatically improved substrate reactivity in this transformation.

Unusual biaryl torsional strain promotes reactivity in Cu-catalyzed Sommelet–Hauser rearrangement