Friedel-Crafts cyclialkylations of some epoxides. 3. Cyclizations of tertiary and meta-substituted arylalkyl epoxides
作者:Stephen K. Taylor、Curtis L. Blankespoor、Suzanne M. Harvey、Lynell J. Richardson
DOI:10.1021/jo00249a032
日期:1988.7
Enantiospecific bromonium ion generation and intramolecular capture: a model system for asymmetric bromonium ion-induced polyene cyclisations
作者:D. Christopher Braddock、Jared S. Marklew、Alexander J. F. Thomas
DOI:10.1039/c1cc13619d
日期:——
Scalemic bromoniumions generated enantiospecifically by the action of catalytic triflic acid on scalemic regioisomeric bromohydrin derivatives are trapped intramolecularly, enantiospecifically and regioselectively to give bicyclic brominated carbocycles in excellent yield and high enantiomeric excess. This enantiospecific pathway is not significantly perturbed by the addition of a trisubstituted alkene