Self-association-free dimeric cinchona alkaloid organocatalysts: unprecedented catalytic activity, enantioselectivity and catalyst recyclability in dynamic kinetic resolution of racemic azlactones
作者:Ji Woong Lee、Tae Hi Ryu、Joong Suk Oh、Han Yong Bae、Hyeong Bin Jang、Choong Eui Song
DOI:10.1039/b917882a
日期:——
Self-association-free, bifunctional, squaramide-based dimeric cinchonaalkaloidorganocatalysts show unprecedented catalytic activity, enantioselectivity and catalyst recyclability in the dynamic kinetic resolution (DKR) reaction of a broad range of racemic azlactones.
Enantioselective polyclonal antibodies have been produced and characterized to develop a high-throughput screening method for lipase activity fingerprinting, with a view to the enantioselective hydrolysis of azlactones.
α-Aminoacidderivatives are key components of the molecules of life. A hydrative amination of ynamides/thioalkynes under metal-free and mild conditions has been developed. This practical strategy offers a new and convenient avenue for the synthesis of α-aminoacidderivativesusing readily available sulfinamides as nitrogen sources. Computational studies suggest that the reaction is enabled by a new
Metallaphotoredox‐Catalyzed Enantioselective Cross‐Electrophile Coupling Using Alcohols as Reducing Agents
作者:Zhilong Li、Leitao Huan、Jian Li、Xiaomin Shu、De Zhong、Wenjing Zhang、Haohua Huo
DOI:10.1002/anie.202305889
日期:2023.8
An enantioselective coupling of α-amino acid derivatives and aryl bromides, using Ni/photoredox catalysis and alcohols as reducingagents, is reported. This protocol offers modular access to enantioenriched benzylic amines from abundant precursors, and is suitable for late-stage diversification with broad functional group tolerance. The alcohol-based approach holds potential as a general platform for
Regioselective Synthesis of 3-Trifluoromethylpyrroles by [3 + 2] Cycloaddition of <i>N</i>-Acyl α-Amino Acids and 2-Bromo-3,3,3-trifluoropropene
作者:Weidi Zeng、Hui Li、Duozhi Wang、Lei Zhou
DOI:10.1021/acs.joc.3c01611
日期:2023.10.6
A mild and concise method for the synthesis of 3-trifluoromethylpyrroles via base-mediated [3 + 2] cycloaddition of N-acyl α-amino acids and 2-bromo-3,3,3-trifluoropropene is described. N-Acyl α-amino acids serve as 1,3-dipole precursors without additional activating agents directly. A high level of regioselectivity was observed, regardless of the electronic nature and size of the substituents on 1