开发了铜催化的2-芳基氮丙啶和环状甲硅烷基二烯醇醚的非对映选择性[3 + 2]环加成反应,以有效构建稠合-[5, n ]碳环吡咯烷,该化合物广泛存在于生物活性天然产物中。机理研究表明,这种转化的高非对映选择性源于连续的逆向氮杂迈克尔/差向异构化/氮杂迈克尔过程。利用这种新开发的方法,首次实现了 pancratinines B 和 C 的全合成。
A new generation of terminal copper nitrenes and their application in aromatic C–H amination reactions
作者:Fabian Thomas、Matthias Oster、Florian Schön、Kai C. Göbgen、Benedikt Amarouch、Dominik Steden、Alexander Hoffmann、Sonja Herres-Pawlis
DOI:10.1039/d1dt00832c
日期:——
dichloromethane. We show that the ligand design has a major influence on the catalytic activity and the thermal stability of the copper nitrene complex. Not only the choice of the third N donor, but also the substituent in the 5-position of the pyrazolyl moiety, have an impact on the stability. Furthermore, the novel copper nitrene complexes were used for catalytic aziridination of styrenes and C–H
Addition Reactions of Chloro- or Iodomethyllithium to Imines. Synthesis of Enantiopure Aziridines and β-Chloroamines
作者:José M. Concellón、Humberto Rodríguez-Solla、Pablo L. Bernad、Carmen Simal
DOI:10.1021/jo802596y
日期:2009.3.20
We report a novel, simple, and efficient synthesis of aziridines and 1-chloroalkan-2-amines by the reaction of imines derived from various aldehydes and p-toluenesulfonamide or benzenesulfonamide with iodoor chloromethyllithium, respectively. Both halogenated anions were generated in situ by treatment of diiodo- or chloroiodomethane with methyllithium at -78 or 0 degrees C. The reaction of in situ generated iodo- or chloromethyllithium could also be performed from chiral 2-aminoaldimines to yield enantiopure aziridines or (2S,3S)-2,3-diamino-1-chloroalkanes with high stereoselectivity.
Lewis Acid Catalyzed Dynamic Kinetic Asymmetric Transformation of Racemic <i>N</i>-Sulfonylaziridines
The first Lewisacid catalyzed stereoconvergent transformation of racemic 2-(hetero)aryl- N-sulfonylaziridines via C-N bond cleavage with nucleophiles is presented. This includes the [3 + 2] annulations with (hetero)aromatic aldehydes and 1,3-disubstituted indoles, asymmetric Friedel-Crafts type reaction with electron-rich (hetero)arenes, and asymmetric aminolysis with amines, providing facile access
Diastereoselective Construction of Fused Carbocyclic Pyrrolidines via a Copper-Catalyzed [3 + 2] Cycloaddition: Total Syntheses of Pancratinines B–C
作者:Fang Wang、Xiaohan Xu、Yangtian Yan、Jiayang Zhang、Wen-Ju Bai、Jianwei Chen、Yang Yang
DOI:10.1021/acs.orglett.3c02310
日期:2023.9.22
A Cu-catalyzed diastereoselective [3 + 2] cycloaddition of 2-arylaziridines and cyclic silyl dienol ethers was developed to efficiently construct fused-[5,n] carbocyclic pyrrolidines, which are widespread in bioactive natural products. Mechanistic studies revealed that the high diastereoselectivity of this transformation arose from a sequential retro aza-Michael/epimerization/aza-Michael process. Taking
开发了铜催化的2-芳基氮丙啶和环状甲硅烷基二烯醇醚的非对映选择性[3 + 2]环加成反应,以有效构建稠合-[5, n ]碳环吡咯烷,该化合物广泛存在于生物活性天然产物中。机理研究表明,这种转化的高非对映选择性源于连续的逆向氮杂迈克尔/差向异构化/氮杂迈克尔过程。利用这种新开发的方法,首次实现了 pancratinines B 和 C 的全合成。