作者:Stefania F. Musolino、O. Stephen Ojo、Nicholas J. Westwood、James E. Taylor、Andrew D. Smith
DOI:10.1002/chem.201604788
日期:2016.12.23
The non‐enzymatic acylative kineticresolution of challenging aryl–alkenyl (sp2 vs. sp2) substituted secondaryalcohols is described, with effective enantiodiscrimination achieved using the isothiourea organocatalyst HyperBTM (1 mol %) and isobutyric anhydride. The kineticresolution of a wide range of aryl–alkenyl substituted alcohols has been evaluated, with either electron‐rich or naphthyl aryl
描述了具有挑战性的芳基-烯基(sp 2与 sp 2 )取代的仲醇的非酶酰化动力学拆分,并使用异硫脲有机催化剂 HyperBTM(1 mol%)和异丁酸酐实现了有效的对映区分。已经评估了各种芳基-烯基取代醇的动力学拆分,其中富电子或萘基芳基取代基与未取代的乙烯基取代基相结合,提供了最高的选择性( S =2-1980)。演示了使用该方案对模型芳基-乙烯基(sp 2与 sp 2 )取代的仲醇进行克级(2.5 g)动力学拆分,可获取每种产物对映体的 >1 g 99:1呃。
On the Reactivity of <i>o</i>-Lithioaryl Ethers: Tandem Anion Translocation and Wittig Rearrangement
作者:José Barluenga、Francisco J. Fañanás、Roberto Sanz、César Marcos、Marta Trabada
DOI:10.1021/ol0258029
日期:2002.5.1
[reaction: see text]. Allyl and benzyl 2-lithioaryl ethers, generated by bromine-lithium exchange in THF, undergo a new tandem anion translocation-[1,2]-Wittig rearrangement allowing the isolation of the corresponding benzylic alcohols.
Novel Episulfone Substitution and Ring-Opening Reactions via α-Sulfonyl Carbanion Intermediates
作者:Nigel S. Simpkins
DOI:10.1080/10426509708545519
日期:1997.1.1
Three-membered cyclic sulfones undergo substitution on treatment with baseelectrophile mixtures, such as LDA-Me3SiCl and tBu-P4-phosphazene base-PhCHO, to give either substituted episulfones or the corresponding alkenes following loss of SO2. In the absence of Me3SiCl, reaction of episulfones with LDA results in ring-opening to give alkenyl sulfinate intermediates, which can be alkylated to give (E)-alkenyl