Chiral cyclopentadienyl rhodium (CpRh) complexcatalyzeda symmetric CÀHf unctionalization reactions have witnessed as ignificant progress in organic synthesis.I ns harp contrast, the reported chiral Cp ligands are limited to C-linked Cp and are often synthetically challenging.T oa ddress these issues,w eh ave developed an ovel class of tunable chiral cyclopentadienyl ligands bearing oxygen linkers,w hich were efficient catalysts for CÀHa rylation of benzo[h]quinolines with 1-diazonaphthoquinones,a ffording axially chiral heterobiaryls in excellent yields and enantioselectivity (up to 99 % yield, 98.5:1.5 er). Mechanistic studies suggest that the reaction is likely to proceed by electrophilic C À Ha ctivation, and followed by coupling of the cyclometalated rhodium(III) complex with 1-diazonaphthoquinones.

No abstract

Asymmetric Dearomatization of -Naphthols Through a Bifunctional-Thiourea--Catalyzed Michael Reaction. -An interesting asymmetric dearomatization of -naphthols is achieved by Michael reaction with nitroethane as reaction partner using a bifunctional chiral thiourea as catalyst. -(WANG, S.-G.; LIU, X.-J.; ZHAO, Q.-C.; ZHENG, C.; WANG, S.-B.; YOU*, S.-L.; Angew.