Enantioselective catalytic epoxidation of cinnamate esters
作者:Eric N. Jacobsen、Li Deng、Yoshiro Furukawa、Luis E. Martínez
DOI:10.1016/s0040-4020(01)89369-8
日期:1994.4
A broad study of the (salen)Mn(III)-catalyzedasymmetric epoxidation of cis-cinnamate esters reveals that the steric properties of the ester group have a profound influence on enantioselectivity in the epoxidation reaction, with bulkier esters affording highest ee's. The sensitivity of the reaction selectivity to the steric properties of the cis-alkene are consistent with a “skewed” side-on approach
Carbocation Lewis Acid TrBF<sub>4</sub>-Catalyzed 1,2-Hydride Migration: Approaches to (<i>Z</i>)-α,β-Unsaturated Esters and α-Branched β-Ketocarbonyls
作者:Wansong Shang、Depeng Duan、Yongjun Liu、Jian Lv
DOI:10.1021/acs.orglett.9b03005
日期:2019.10.4
CarbocationLewisacid TrBF4-catalyzed 1,2-hydride migration of α-alkyldiazoacetates themselves or in situ-generated cross-coupling adducts of aldehydes and α-alkyldiazoacetates has been developed, affording (Z)-α,β-unsaturated esters and α-branched β-ketocarbonyls, respectively, in good yields and with high regioselectivities.
Chiral Manganese Aminopyridine Complexes: the Versatile Catalysts of Chemo- and Stereoselective Oxidations with H<sub>2</sub>
O<sub>2</sub>
作者:Roman V. Ottenbacher、Evgenii P. Talsi、Konstantin P. Bryliakov
DOI:10.1002/tcr.201700032
日期:2018.1
In the last decade, manganese(II) complexes with N‐donor tetradentate aminopyridine ligands emerged as efficient catalysts of enantioselective epoxidation of olefins and direct selective oxidation of C−H groups in complex organic molecules, with environmentally benign oxidant hydrogen peroxide. In this personal account, we summarize the progress of these catalysts with regard to ligands design, structure‐reactivity
Convenient Preparations of (Diphenylphosphono)acetic Acid Esters and the Comparison of the <i>Z</i>-Selectivities of Their Horner−Wadsworth−Emmons Reaction with Aldehydes Depending on the Ester Moiety
作者:Kaori Ando
DOI:10.1021/jo9907181
日期:1999.10.1
Catalytic asymmetric dihydroxylation of cis-disubstituted olefins