A dynamickineticresolution approach was developed for the synthesis of axiallychiral diaryl ethers via a Brønsted acid catalyzed atroposelective transfer hydrogenation (ATH) reaction of dicarbaldehydes with anilines. The chiral phosphoric acid catalyzed dynamickineticresolution strategy has provided a modular platform for the synthesis of axiallychiral diaryl ethers.
studies towards a small molecule catalytic approach to access atropisomeric diaryl ethers that proceeds via a C(sp2)-H alkylation using nitroalkanes as the alkyl source. A quaternary ammonium salt derived from quinine containing a sterically hindered urea at the C-9 position was found to effect atroposelective C(sp2)-H alkylation with moderate to good enantioselectivities across several naphthoquinone-containing