Samarium Diiodide-Promoted Reductive Coupling of Imines
作者:Tsuneo Imamoto、Seijiro Nishimura
DOI:10.1246/cl.1990.1141
日期:1990.7
Aromatic aldimines are reductively coupled to 1,2-diamines by treatment with samarium diiodide. Cross-coupling of aromatic ketimines with ketones to 2-aminoalcohols is also promoted by the same reagent.
Mechanistische Studien zur Bildung von Diphenyläthylendiaminen aus Benzylidenalkylaminen und aktiviertem Aluminium. 5. Mitt. über Cytostatica
作者:H. Schönenberger、H. Thies、A. Rappl
DOI:10.1002/ardp.19673000312
日期:——
Die Reduktion von Benzylidenalkylaminen mit aktiviertem Aluminium in Alkohol führt zur Bildung von Gemischen aus N,N′‐Dialkyl‐α,α′‐diphenyläthylendiamin (Dimerprodukt) und Benzylalkylamin (Monomerprodukt). Bestimmend für das Verhältnis Dimerprodukt: Monomerprodukt ist die Retentionsdauer des Aldimins an der Aluminiumoberfläche. Die Bildung der Dimerprodukte erfordert kürzere, die der Monomerprodukte
用活化的铝在醇中还原苯亚甲基烷基胺导致形成 N, N' - 二烷基 - α, α' - 二苯基乙二胺(二聚体产物)和苄基烷基胺(单体产物)的混合物。铝表面上醛亚胺的保留时间对于二聚体产物:单体产物的比例是决定性的。二聚体产物的形成需要较短的保留时间,而单体产物的形成需要较长的保留时间。它们一方面取决于席夫碱的碱度、温度以及一方面取决于席夫碱与另一方面取决于醇分子之间的相互作用。
Synthesis of enantiomerically pure C2-symmetric acyclic and cyclic 1,2-diamines via pinacol coupling of imines
The inter- and intramolecularcoupling of imines promoted by samariumdiiodide and Lewis acids or by Zn/MsOH was extensively studied. The intramolecularreaction of chiral, enantiomerically pure bis-imines was also considered, and allowed the efficient, stereoselective synthesis of 1,2-diamines with C2-symmetry.
Iminopinacol coupling with lithium: electron-transfer mediators
作者:Electron A. Mistryukov
DOI:10.1070/mc2002v012n06abeh001617
日期:2002.1
The addition of tert-butyl borate or ethyl formate to N-alkylbenzalimines directs the reaction pathway from the Birch reduction to the pinacol-type coupling with lithium in THF; an analogous reaction with a dimethylimmonium salt requires a trace titanium catalyst as the electron-transfer mediator.
Photoreductive Coupling of Aldimines. Synthesis of C2 Symmetrical Diamines
作者:Pedro J Campos、Joaquı́n Arranz、Miguel A Rodrı́guez
DOI:10.1016/s0040-4020(00)00625-6
日期:2000.9
The photoreductive coupling of pyridine-, arene- and alkynecarboxaldimines is a very convenient procedure for the preparation of vicinal diamines in good to excellent yields. The usual trend gave an excess of meso diamine, which enhances the usefulness of this method. The procedure tolerates bulky groups such as tert-butyl and diphenylmethyl on the nitrogen atom. (C) 2000 Elsevier Science Ltd. All rights reserved.