A high-efficiency tandem process has been developed for the formation of two C–N bonds through a cross-dehydrogenative coupling (CDC) amination of spiro[acridine-9,9′-fluorene]s (SAFs) with amines. This method offers a strategically innovative and atom-economical approach to obtaining diamine-substituted SAFs. Notably, the approach eliminates the need for metal catalysts and other additives, relying solely on O2 as the oxidant. A self-activation mechanism has been proposed to elucidate the effective double amination in the CDC process.
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Wei et al. (2024) studied this question.
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