Organocatalytic Aziridine Synthesis Using F<sup>+</sup> Salts
作者:Sean P. Bew、Shirley A. Fairhurst、David L. Hughes、Laurent Legentil、John Liddle、Paolo Pesce、Sanket Nigudkar、Martin A. Wilson
DOI:10.1021/ol901784m
日期:2009.10.15
This paper describes a unique application of the fluoronium cation (F+) as an organocatalyst for mediating the reaction between N-substituted imines and ethyl diazoacetate affording excellent yields of N-substituted aziridines.
Enantioselective addition of various aryllithiumreagents to aromatic imines was catalyzed (20 mol-%) by readily accessible 1,2-diamines to afford a wide range of protected diarylmethylamines in up to 94 % enantiomeric excess. Furthermore, the absolute configuration of these arylation products was determined by using X-ray crystallography.
各种芳基锂试剂与芳族亚胺的对映选择性加成反应 (20 mol-%) 由易于获得的 1,2-二胺催化,得到多种保护的二芳基甲基胺,对映体过量高达 94%。此外,这些芳基化产物的绝对构型是通过使用 X 射线晶体学确定的。
Asymmetric 1,2-addition of organolithiums to aldimines catalyzed by chiral ligand
An asymmetric 1,2-addition reaction of organolithiums with imines 3, 7 was catalysed by a 0.05–1.3 equivalent of a chiral amino ether 2 to provide the corresponding optically active amines 4, 8.
Copper-Catalyzed Borylative Cross-Coupling of Allenes and Imines: Selective Three-Component Assembly of Branched Homoallyl Amines
作者:James Rae、Kay Yeung、Joseph J. W. McDouall、David J. Procter
DOI:10.1002/anie.201508959
日期:2016.1.18
A copper‐catalyzed three‐component coupling of allenes, bis(pinacolato)diboron, and imines allows regio‐, chemo‐, and diastereoselective assembly of branched α,β‐substituted‐γ‐boryl homoallylic amines, that is, products bearing versatile amino, alkenyl, and borane functionality. Alternatively, convenient oxidative workup allows access to α‐substituted‐β‐amino ketones. A computational study has been
A three-step methodology involving an external chiral ligand-mediated asymmetric addition of phenyllithium to an anisidine imine, oxidative removal of N-PMP group, and finally oxidative conversion of the phenyl group to a carboxyl group provides a facile synthesis of opticallypureα-aminoacid derivatives bearing a bulky α-substituent.