Expedient route to 3- and 3,3′-substituted 1,1′-bi-2-naphthols by directed ortho metalation and suzuki cross coupling methods
作者:Paul J. Cox、Wei Wang、Victor Snieckus
DOI:10.1016/s0040-4039(00)74182-7
日期:1992.4
A directed ortho metalation-based route to 3- and 3,3'-substituted binaphthols 2a-c and 3a-c, including chiral materials, is described. Using the Suzuki cross coupling process, dibromo system 3a (E = Br) has been transformed into 3,3'-diaryl binaphthols 5.
Lewis Acid-Activated Chiral Leaving Group: Enantioselective Electrophilic Addition to Prochiral Olefins
A new strategy using a BINOL derivative as a chiral leaving group and Lewis acid has been developed for enantioselective alkylation of prochiral olefins. (R)-2,2'-Bis[2-(trimethylsilyl)ethoxymethyl]-1,1'-binaphthol is demonstrated to be an effective reagent for enantioselective hydroxymethylation of silyl enol ethers and trisubstituted alkenes. Electrophilic addition to prochiral olefins is accompanied