A New Entry to Asymmetric Synthesis of Optically Active α,γ-Substituted γ-Butyrolactones, Using a Carbohydrate Derived Amide as Both a Chiral Auxiliary and a Proton Source
作者:Ling-Lin Huang、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1021/jo0485637
日期:2005.1.1
A new entry for the asymmetricsynthesis of opticallyactive α,γ-substituted γ-butyrolactones was developed by using a carbohydrate-derived amide as both a chiral auxiliary and a proton source. Unlike the previously reported examples, the chiral auxiliary employed in this reaction also successfully functioned as a protonating agent. Excellent asymmetric induction could be achieved by this dual stereoselective
Chiral ligand control in enantioselective reduction of ketones by SmI2 for ketyl radical addition to olefins
作者:Koichi Mikami、Makoto Yamaoka
DOI:10.1016/s0040-4039(98)00799-0
日期:1998.6
Samarium(II) diiodide-mediated reductive coupling of ketones with α,β-unsaturated esters is shown to afford enantioselectively γ-butyrolactones by the addition of 2,2′-bis(diphenylphosphinyl)-1,1′-binaphthyl (BINAPO) as a chiral ligand.
Development of a New Reaction System for the Synthesis of Highly Optically Active α,γ-Substituted γ-Butyrolactones
作者:Ming-Hua Xu、Wei Wang、Li-Jun Xia、Guo-Qiang Lin
DOI:10.1021/jo0155153
日期:2001.6.1
A highly useful method for the synthesis of optically active alpha,gamma-substituted gamma-butyrolactones has been developed. The SmI(2)-induced reductive coupling of chiral 2-alkyl acrylates derived from isosorbide with ketones in the presence of (1S)-(-)-2,10-camphorsultam as a proton source give the chiral alpha,gamma-substituted gamma-butyrolactones in good yields and high enantiomeric purities