Synthesis of Phosphoramides for the Lewis Base-Catalyzed Allylation and Aldol Addition Reactions
作者:Scott E. Denmark、Xiping Su、Yutaka Nishigaichi、Diane M. Coe、Ken-Tsung Wong、Stephen B. D. Winter、Jun Young Choi
DOI:10.1021/jo9820723
日期:1999.3.1
Both chiral and achiral phosphoramides of diverse structure were prepared from diamines by the coupling to phosphorus(V) or phosphorus(III) reagents. Several enantiopure 1,2-diphenyl-1,2-ethanediamine analogues have been prepared by the reductive coupling of the corresponding N-silylimine with NbCl(4)(THF)(2) and subsequent resolution by the formation of diastereomeric menthyl carbamates. (S,S)-N,
A New, Short, and Stereocontrolled Synthesis of <i>C</i><sub>2</sub>-Symmetric 1,2-Diamines
作者:Rajender Vemula、Nathan C. Wilde、Rajendar Goreti、E. J. Corey
DOI:10.1021/acs.orglett.7b01768
日期:2017.7.21
reaction of ammonia, glyoxal hydrate, and cyclohexanone. It is a very useful precursor for the diastereocontrolled synthesis of many C2-symmetric 1,2-diamines, a class which is important for the generation of a variety of C2-symmetric reagents and catalysts for enantioselective synthesis.
Construction of Vicinal All-Carbon Stereogenic Centers via Copper-Catalyzed Asymmetric Decarboxylative Propargylation: Enantio- and Diastereoselective Synthesis of Substituted Spirolactones
The formation of vicinal all-carbonquaternarystereocenters remains a formidable challenge. We report herein the synthesis of such highly congested structural dyads by copper-catalyzed decarboxylative propargylation between propargyl carbonates and indanone-based nucleophiles. The implementation of diphenylethylenediamine (DPEN)-based ligands is the key to success. A wide range of functional groups
Reductive coupling of aromatic oxims and azines to 1,2-diamines using Zn-MsOH or Zn-TiCl 4
作者:Naoki Kise、Nasuo Ueda
DOI:10.1016/s0040-4039(01)00178-2
日期:2001.3
The reduction of aromatic aldoxims and azines with Zn in the presence of MsOH or TiCl4 afforded N.N'-unsubstituted 1,2-diamines in one-step. The reductive coupling with Zn-MsOH gave meso 1,2-diamines selectively, whereas cll 1,2-diamines were formed selectively by the reduction with Zn-TiCl4. (C) 2001 Elsevier Science Ltd. All rights reserved.
Facile conversion of 1,2-dicyanobenzene into chiral bisamidines
作者:Mariano Goldberg、Masaki Nakajima、Michael Bolte、Michael W. Göbel