Branched Amine Synthesis via Aziridine or Azetidine Opening with Organotrifluoroborates by Cooperative Brønsted/Lewis Acid Catalysis: An Acid-Dependent Divergent Mechanism
作者:Truong N. Nguyen、Jeremy A. May
DOI:10.1021/acs.orglett.8b01394
日期:2018.6.15
A practical catalytic method to synthesize β,β- and γ,γ-substituted amines by opening aziridines and azetidines, respectively, using alkenyl, alkynyl, or aryl/heteroaryl trifluoroborate salts is described. This reaction features simple open-flask reaction conditions, the use of transition-metal-free catalysis, complete regioselectivity, and high diastereoselectivity. Preliminary mechanistic studies
Synthesis of Copper(I) Complexes of N‐Heterocyclic Carbene–Phenoxyimine/amine Ligands: Structures of Mononuclear Copper(II), Mixed‐Valence Copper(I)/(II), and Copper(II) Cluster Complexes
作者:Stevan Simonovic、Adrian C. Whitwood、William Clegg、Ross W. Harrington、Michael B. Hursthouse、Louise Male、Richard E. Douthwaite
DOI:10.1002/ejic.200801152
日期:2009.5
Reaction between the silver(I) bromide derivative of 1a and CuCl2·2H2O gives a complex derivedfrom a Cu6(O)(OH)4Cl3 core and two (NO) and one (CNO) ligands, respectively. The use of 2a and 7 as precatalysts for 1,4-conjugate addition to enones and aziridination of alkenes was studied, showing that, whilst both catalysts are active, enantioselectivities are low, which is attributed to the lack of Cu-(NO)
Trifluoromethylation of Disubstituted Morpholines by Metal-Free Visible Light Photoredox Catalysis
作者:Vishal Srivastava、Pravin K. Singh、Praveen P. Singh
DOI:10.14233/ajchem.2016.19893
日期:——
A mild and efficient one-pot visible light-induced method has been developed for the trifluoromethylation of disubstituted morpholines. This method includes synthesis of substituted 4-tosyl-5-[(trifluoromethyl)thio]morpholine 4(a-l) from tosylaziridine 1(a-l) and oxiran-2-thiol (2) in presence of eosin Y as an organophotoredox catalyst at room temperature under aerobic condition.
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.
Stereospecific Assembly of Fused Imidazolidines via Tandem Ring Opening/Oxidative Amination of Aziridines with Cyclic Secondary Amines Using Photoredox Catalysis
Sustainable assembly of imidazolidines is accomplished via a sequential stereospecific ringopening and C–H amination using aziridines with secondary cyclic amines under visible light mediated indazoloquinoline photoredox catalysis at ambient conditions. Optically active aziridines are coupled with high enantiomeric purities. The computational studies provide insights on the redox properties of the