Silver-Catalyzed [3+3] Annulation of Glycine Imino Esters with Seyferth–Gilbert Reagent To Access Tetrahydro-1,2,4-triazinecarboxylate Esters
作者:Chi Wai Cheung、Jun-An Ma、Yin-Jun Huang、Jing Nie
DOI:10.1055/s-0039-1690894
日期:2020.7
A silver-catalyzed protocol for [3+3] annulation of glycine imino esters with Seyferth–Gilbert reagent was developed. A variety of phosphorylated tetrahydro-1,2,4-triazinecarboxylate esters were synthesized in moderate to good yields and with excellent diastereoselectivities. The dehydrogenation of a tetrahydro-1,2,4-triazine product to the corresponding triazine counterpart was also demonstrated.
Design, Synthesis, and Biological Evaluation of Chemically and Biologically Diverse Pyrroquinoline Pseudo Natural Products
作者:Jie Liu、Gregor S. Cremosnik、Felix Otte、Axel Pahl、Sonja Sievers、Carsten Strohmann、Herbert Waldmann
DOI:10.1002/anie.202013731
日期:2021.2.23
Naturalproduct (NP) structures are a rich source of inspiration for the discovery of new biologically relevant chemical matter. In naturalproduct inspired pseudo‐NPs, NP‐derived fragments are combined de novo in unprecedented arrangements. Described here is the design and synthesis of a 155‐member pyrroquinoline pseudo‐NP collection in which fragments characteristic of the tetrahydroquinoline and
Asymmetric Construction of Pyrrolidines Bearing a Trifluoromethylated Quaternary Stereogenic Center via Cu<sup>I</sup>
-Catalyzed 1,3-Dipolar Cycloaddition of Azomethine Ylides with β-CF<sub>3</sub>
-β,β-Disubstituted Nitroalkenes
convenient method has been developed for the synthesis of opticallyactivepyrrolidines bearing a quaternary stereogenic center containing a CF3 group at the C‐3 position of the pyrrolidine ring. The synthesis system, CuI/Si‐FOXAP‐catalyzed exo‐selective 1,3‐dipolar cycloaddition of azomethine ylides with β‐CF3‐β,β‐disubstituted nitroalkenes, provides pyrrolidines with high diastereoselectivities (up to
Regio- and diastereoselective construction of a new set of functionalized pyrrolidine, spiropyrrolidine and spiropyrrolizidine scaffolds appended with aryl- and heteroaryl moieties via the azomethine ylide cycloadditions
Highly regio- and diastereoselective syntheses of a new set of functionalized pyrrolidines, spiro-pyrrolidine/pyrrolizidine oxindoles, spiroacenaphthylenolyl-pyrrolidines/pyrrolizidines and spiro-1,3-indandionolyl-pyrrolidines/pyrrolizidines appended with various aryl- and heteroaryl moieties via the azomethine ylide cycloaddition reaction are reported. The Ag-catalyzed [3+2] cycloaddition of azomethine
Metal-Free Asymmetric 1,3-Dipolar Cycloaddition of N-Arylmaleimides to Azomethine Ylides Catalyzed by Chiral Tertiary Amine Thiourea
作者:Jian-Fei Bai、Liang-Liang Wang、Lin Peng、Yun-Long Guo、Jun-Nan Ming、Fei-Ying Wang、Xiao-Ying Xu、Li-Xin Wang
DOI:10.1002/ejoc.201100205
日期:2011.8
The first metal-freeasymmetric 1,3-dipolar cycloaddition of N-arylmaleimides to azomethine ylides catalyzed by chiral tertiary amine thiourea to form multiply substituted pyrrolidines in excellent yields (up to 89 %) and enantioselectivities (up to 96 % ee) is presented. This procedure allows a rapid diversity-oriented synthesis of chiral pyrrolidine derivatives with high optical purity.