Iridium-Catalyzed Enantioselective Allylic Substitution with Aqueous Solutions of Nucleophiles
作者:Tobias Sandmeier、F. Wieland Goetzke、Simon Krautwald、Erick M. Carreira
DOI:10.1021/jacs.9b05830
日期:2019.8.7
The iridium-catalyzed asymmetric allylic substitution under biphasic conditions is reported. This approach allows the use of various unstable and/or volatile nucleophiles including hydrazines, methyl-amine, t-butyl hydroperoxide, N-hydroxylamine, α-chloroacetaldehyde and glutaraldehyde. This transformation pro-vides rapid access to a broad range of products from simple starting materials in good yields
报道了双相条件下铱催化的不对称烯丙基取代。这种方法允许使用各种不稳定和/或挥发性亲核试剂,包括肼、甲胺、叔丁基过氧化氢、N-羟胺、α-氯乙醛和戊二醛。这种转变提供了从简单的起始材料以良好的产率和高达 > 99% ee 和 20:1 dr 快速获得广泛产品的途径。此外,这些产品可以有效地加工成多种环状和非环状化合物,最多可带有四个立体中心。
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。
Ruthenium-Catalyzed Regio- and Enantioselective Allylic Substitution with Water: Direct Synthesis of Chiral Allylic Alcohols
作者:Naoya Kanbayashi、Kiyotaka Onitsuka
DOI:10.1002/anie.201101078
日期:2011.5.23
Less is more: A new route to access chiralallylic alcohols through the regio‐ and enantioselectivesubstitution of monosubstituted allylic chlorides with water has been developed. The reaction is catalyzed effectively by planar‐chiral cyclopentadienyl ruthenium complexes (see scheme).
Kinetic resolution of allylic alcohols via stereoselective acylation catalyzed by lipase PS-30
作者:Peiran Chen、Peng Xiang
DOI:10.1016/j.tetlet.2011.08.093
日期:2011.11
By using lipase PS-30 as catalyst, the kineticresolution of a series of racemic allylic alcohols has been achieved via stereoselective acylation. The value of kinetic enantiomeric ratio (E) reached up to 968. Substituent effect is briefly discussed.