Abstract
A new strategy for the enantioselective construction of chiral 2,3-cis-dimethyldihydrobenzofurans has been developed by a ruthenium-catalyzed asymmetric hydrogenation of racemic α-aryloxybutanone via dynamic kinetic resolution (DKR), combined with a palladium-catalyzed intramolecular reductive Heck cyclization. Starting from optically active 2,3-cis-dimethyldihydrobenzofuran, the natural products (+)/(−)-PI-220 and (+)-3-epi-furaquinocin C were synthesized in high yields.
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