Add time:09/28/2019         Source:infona.pl

Two 1‐[6]helicenol derivatives were synthesized by Ni‐catalyzed [2+2+2] cycloaddition on a multigram scale. Both enantiomers of the 1‐[6]helicenols could be efficiently prepared by simple optical resolution. As a synthetic application of helically chiral 1‐[6]helicenols, a novel class of [6]helicene‐based phosphinites was developed; these compounds represent the first examples of helically chiral phosphinite ligands. Up to 90 % ee was obtained for the Pd‐catalyzed asymmetric allylic alkylation reaction.

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