Stereoselective Copper-Catalyzed Cross-Coupling of Aziridines with Benzimidazoles via Nucleophilic Ring Opening and C(sp<sup>2</sup>)–H Functionalization
A copper-catalyzed cross-coupling of 2-alkyl-/2-arylaziridines with benzimidazoles is reported. The reactions involve a regiospecific ring opening of aziridines with benzimidazoles to give benzoimidazolylethylamine derivatives that lead to dehydrogenative cross-coupling between C(sp2)-H and N–H bonds to produce dihydroimidazobenzimidazoles. Optically active 2-arylaziridines can be stereoinvertivebly
A Rh(III)-Catalyzed Formal [4+1] Approach to Pyrrolidines from Unactivated Terminal Alkenes and Nitrene Sources
作者:Sumin Lee、Honghui Lei、Tomislav Rovis
DOI:10.1021/jacs.9b07012
日期:2019.8.14
formal [4+1] approach to pyrrolidines from readily available unactivated terminalalkenes as 4-carbon partners. The reaction provides a rapid construction of various pyrrolidine containing structures, especially for the diastereoselective synthesis of spiro-pyrrolidines. Mechanistic investigation suggests a Rh(III)-catalyzed intermolecular aziridination of the alkene and subsequent acid-promoted ring expansion
A domino Bi‐catalysedC−N/C−S bondformation of N‐sulfonylaziridines is developed with 1,4‐dithiane‐2,5‐diol to give 3,4‐dihydro‐1,4‐thiazines at room temperature. The use of Bi(OTf)3 as a catalyst, atom economy and regioselectivity are the important practical features.
goal in organic synthesis. Herein, the Cu-catalyzed synthesis of imidazolidine through heterocyclic recombination between aziridine and diazetidine is presented. The scope is sufficiently broad to form various imidazolidines, since the reaction conditions are suitable for many functional groups.Copper-Catalyzed Heterocyclic Recombination of Aziridine and Diazetidine for the Synthesis of Imidazolidine