The indiumâbipyridine-catalyzed, enantioselective ring-opening of meso-epoxides with aliphatic and aromatic thiols furnished 1,2-mercapto alcohols in good yields and excellent enantioselectivities; the crystal structure of the chiral catalyst reveals a pentagonal-bipyramidal coordination geometry around the indium center.
Chiral Anion-Mediated Asymmetric Ring Opening of <i>meso</i>-Aziridinium and Episulfonium Ions
作者:Gregory L. Hamilton、Toshio Kanai、F. Dean Toste
DOI:10.1021/ja806431d
日期:2008.11.12
traditional asymmetric catalysis based on chiral metals or organocatalysts. We present an enantioselective ringopening of tetrasubstituted meso-aziridinium ions with alcohol nucleophiles proceeding through a chiral ion pair with a binaphthol-phosphate anion. The reaction is initiated by silver-induced ring closure of beta-chloroamines using the Ag salt of the chiral anion as in situ generated catalyst. Use