Quinine-Promoted, Enantioselective Boron-Tethered Diels–Alder Reaction by Anomeric Control of Transition-State Conformation
作者:Katie Scholl、John Dillashaw、Evan Timpy、Yu-hong Lam、Lindsey DeRatt、Tyler R. Benton、Jacqueline P. Powell、K. N. Houk、Jeremy B. Morgan
DOI:10.1021/acs.joc.8b00938
日期:2018.5.18
Diels–Alderreactions of tethered vinyl–metal species offer the opportunity to fashion highly functionalized diol intermediates for synthesis. We have developed the first enantioselective boron-tethered Diels–Alderreaction using quinine as a chiral promoter. Quinine recovery, enantioselectivity enhancement, and manipulation of the cyclohexene core are also investigated. DFT modeling calculations confirm
Asymmetric dihydroxylation of tertiary allylic alcohols
作者:Zhi-Min Wang、K.Barry Sharpless
DOI:10.1016/s0040-4039(00)61396-5
日期:1993.12
The asymmetric dihydroxylation (AD) of tertiary allylicalcohols is examined. Good to excellent ee's are obtained with trans-di- and tri-substituted tertiary allylicalcohols of different substitution patterns except for a trisubstituted case where the tertiary carbinol substituent is on the disubstituted olefinic carbon.