A General Organocatalyzed Michael–Michael Cascade Reaction Generates Functionalized Cyclohexenes
作者:Patrick G. McGarraugh、Joshua H. Jones、Stacey E. Brenner-Moyer
DOI:10.1021/jo201140a
日期:2011.8.5
to α,β-unsaturatedaldehydes are susceptible to multiple subsequent reaction pathways. We designed cyclic unsaturated β-ketoester substrates that enabled the development of the first diphenyl prolinol silyl ether catalyzed Michael–Michael cascadereaction initiated by a β-dicarbonyl Michael donor to form cyclohexene products. The reaction conditions we developed for this Michael–Michael cascade reaction
Organocatalytic Asymmetric Peroxidation of γ,δ-Unsaturated β-Keto Esters—A Novel Route to Chiral Cycloperoxides
作者:Mary C. Hennessy、Hirenkumar Gandhi、Timothy P. O’Sullivan
DOI:10.3390/molecules28114317
日期:——
A methodology for the asymmetric peroxidation of γ,δ-unsaturated β-ketoesters is presented. Using a cinchona-derived organocatalyst, the target δ-peroxy-β-keto esters were obtained in high enantiomeric ratios of up to 95:5. Additionally, these δ-peroxy esters can be readily reduced to chiral δ-hydroxy-β-keto esters without impacting the β-ketoester functionality. Importantly, this chemistry opens