Asymmetric Michael addition of boronic acids to a γ-hydroxy-α,β-unsaturated aldehyde catalyzed by resin-supported peptide
作者:Kengo Akagawa、Masahide Sugiyama、Kazuaki Kudo
DOI:10.1039/c2ob25431j
日期:——
A resin-supportedpeptidecatalyst effective for the asymmetric Michael addition of boronic acids to (E)-4-hydroxybut-2-enal was developed. From a spectral study, it was revealed that the optimum peptide consisted of both a β-turn and helix. Such a combination of secondary structures was essential for achieving a high catalytic ability.
A Redox-Relay Heck Approach to Substituted Tetrahydrofurans
作者:Tom J. M. Byrne、Megan E. Mylrea、James D. Cuthbertson
DOI:10.1021/acs.orglett.3c00769
日期:——
An operationally simple and efficient strategy for the synthesis of substituted tetrahydrofurans from readily available cis-butene-1,4-diol is described. A redox-relay Heck reaction is used to rapidly access cyclichemiacetals that can be directly reduced to afford the corresponding 3-aryl tetrahydrofuran. Furthermore, the hemiacetals can also serve as precursors to a range of disubstituted tetrahydrofurans