Synergistic Cu/Pd Catalysis for Enantioselective Allylic Alkylation of Aldimine Esters: Access to α,α-Disubstituted α-Amino Acids
作者:Liang Wei、Shi-Ming Xu、Qiao Zhu、Chao Che、Chun-Jiang Wang
DOI:10.1002/anie.201707019
日期:2017.9.25
Double duty: An enantioselective allylic alkylation of aldimine esters has been developed by using a synergistic Cu/Pd catalyst system. This strategy provides access to nonproteinogenic α,α-disubstituted α-amino acids in high yield with excellent enantioselectivity. The more challenging double allylic alkylation of glycinate-derived imine esters was also be realized. LG=leaving group.
Ir/Phase‐Transfer‐Catalysis Cooperatively Catalyzed Asymmetric Cascade Allylation/2‐aza‐Cope Rearrangement: An Efficient Route to Homoallylic Amines from Aldimine Esters
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作者:Liang Wei、Lu Xiao、Zuo‐Fei Wang、Hai‐Yan Tao、Chun‐Jiang Wang
DOI:10.1002/cjoc.201900391
日期:2020.1
Ir/phase‐transfer‐catalysiscooperatively catalyzed asymmetric cascade allylation/2‐aza‐Cope rearrangement of aldimine esters to prepare synthetically important homoallylic amines in good yields with excellent enantioselectivities. Compared with the bimetallic catalytic system to realize this transformation, the current cooperative Ir/tetrabutyl ammonium bromide catalytic system provides an alternative
Catalytic Asymmetric Benzylation of Azomethine Ylides Enabled by Synergistic Lewis Acid/Palladium Catalysis
作者:Xin Chang、Jing-Di Ran、Xue-Tao Liu、Chun-Jiang Wang
DOI:10.1021/acs.orglett.2c00865
日期:2022.4.8
synergistic chiral Lewis acid/achiral Pd catalyst system was successfully applied in the enantioselective benzylation of various imine esters, giving a range of α-benzyl-substituted α-amino acid derivatives in satisfactory yield with excellent enantioselectivity. It is worth noting that this strategy exhibits good tolerance for bicyclic and monocyclic benzylic electrophiles. Furthermore, the utility of this
Cooperative Catalyst‐Enabled Regio‐ and Stereodivergent Synthesis of α‐Quaternary α‐Amino Acids via Asymmetric Allylic Alkylation of Aldimine Esters with Racemic Allylic Alcohols
作者:Lu Xiao、Xin Chang、Hui Xu、Qi Xiong、Yanfeng Dang、Chun‐Jiang Wang
DOI:10.1002/anie.202212948
日期:2022.11.14
The regio- and stereodivergent asymmetric α-allylation of aldimine esters with racemic allylic alcohols was enabled by cooperative catalysis. The Et3B additive plays a significant role in ionizing allylic alcohols to form electrophilic metal-π-allyl species and simultaneously promotes the formation of nucleophilic Cu-ylides. Computational mechanistic studies revealed the role of the Et3B additive and
醛亚胺酯与外消旋烯丙醇的区域和立体发散不对称 α-烯丙基化反应是通过协同催化实现的。Et 3 B 添加剂在电离烯丙醇以形成亲电子金属-π-烯丙基物质方面发挥重要作用,同时促进亲核铜叶立德的形成。计算机理研究揭示了 Et 3 B 添加剂的作用以及立体选择性和区域选择性的起源。
Pd‐Catalyzed δ‐C(<i>sp</i><sup>3</sup>)−H Thiolation of Amino Acid Derivatives
作者:Andrés García‐Viada、Celia Sánchez‐González、Mario Martínez‐Mingo、Inés Alonso、Nuria Rodríguez、Juan C. Carretero
DOI:10.1002/adsc.202300808
日期:2023.11.21
δ-thiolation of aliphatic α-amino acids catalyzed by a Pd(II)/Ag(I) system. This reaction employs disulfides as thiolating agents and N-COPy as directing group, providing valuable non-proteinogenic amino acid derivatives in moderate to good diastereoselectivities and yields. Remarkably, the method is also suitable for the late-stage functionalization of a dipeptide. Experimental and DFT studies have provided