Reported here is an efficient enantioselective transfer hydrogenation of cyclic oxocarbenium
ions generated in situ through collapse of the corresponding acetal substrates. The
asymmetric approach provides straightforward access to a variety of chiral α-aryl
substituted 1,3-dihydroisobenzofurans in high yields with excellent enantioselectivities.
α-Alkynyl substituted 1,3-dihydroisobenzofurans were also proved to be suitable substrates.
In addition, when the reaction was performed at gram scale, the desired product was
obtained in good yields with excellent enantioselectivity.
Key words
enantioselectivity - transfer hydrogenation - oxocarbenium ions - α-substituted 1,3-dihydroisobenzofurans
- asymmetric catalysis