Organocatalytic Enantioselective Construction of Heterocycle-Substituted Styrenes with Chiral Atropisomerism

Org Lett. 2020 Mar 20;22(6):2448-2453. doi: 10.1021/acs.orglett.0c00659. Epub 2020 Mar 6.

Abstract

We have developed a novel π-π interaction and dual H-bond concerted control strategy to construct axially chiral naphthylamine heterocycles. With ortho-alkynyl-naphthylamines as the electrophile, indoles and 4-hydroxycoumarins were efficiently employed to construct axially chiral skeletons in good yields and with excellent enantioselectivities (up to 97% enantiomeric excess). Furthermore, the resulting products could be converted to potential squaramides featuring organic catalysts.