Facile Synthesis of Enantioenriched C<sup>γ</sup>-Tetrasubstituted α-Amino Acid Derivatives via an Asymmetric Nucleophilic Addition/Protonation Cascade
An asymmetricnucleophilicaddition/protonation reaction of 3-substituted oxindoles and ethyl 2-phthalimidoacrylate has been described. This strategy can give direct access to Cγ-tetrasubstituted α-amino acid derivatives bearing 1,3-nonadjacent stereocenters with up to 98% yield, 94:6 dr, and >99% ee. Dual activation is proposed in the transition state, and the opposite enantiomers can be obtained
COAP/Pd-Catalyzed Linear Asymmetric Allylic Alkylation for Optically Active 3,3-Disubstituted Oxindole Derivatives with a Four-Carbon Amino Side Chain
作者:Wen-Kai Liu、Bai-Lin Wang、Sheng-Suo Zhou、Jun-Hao Shen、Zheng Wang、Xing-Wang Wang
DOI:10.1021/acs.orglett.2c03902
日期:2023.1.13
An asymmetric linear selective allylicalkylation of vinylaziridines with 3-aryl oxindoles has been developed by using a chiral oxamide-phosphine (COAP-Bn-OMe-p)/palladium complex in methanol, which furnished a wide variety of 3,3-disubstituted oxindole derivatives in good yields with excellent regio- and enantioselectivities.
通过在甲醇中使用手性草酰胺-膦 (COAP-Bn-OMe- p )/钯络合物,开发了乙烯基氮丙啶与 3-芳基羟吲哚的不对称线性选择性烯丙基烷基化反应,可提供多种 3,3-二取代羟吲哚具有良好区域选择性和对映选择性的高收率衍生物。