Synthesis of Iminonitriles by Oxone/TBAB-Mediated One-Pot Oxidative Three-Component Strecker Reaction
摘要:
Oxidative three-component reaction of aldehydes, amines, and TMSCN in a biphasic solvent system (toluene/H2O) containing Oxone, tetra-n-butylammonium bromide (TBAB) and sodium bicarbonate afforded alpha-iminonitriles in good to excellent yields. This oxidative Strecker reaction was applicable to a wide range of aldehydes and amines, aromatic or aliphatic, of different electronic and steric properties. Substituted 1-aza-2-cyano-1,3-dienes were also accessible using alpha,beta-unsaturated aldehydes as inputs.
Regiochemical switching of Mitsunobu cyclisation mode of vicinal diamines with pendant hydroxyl group
作者:James C. Anderson、Helen A. Chapman
DOI:10.1039/b705081j
日期:——
Ambident 1,2-diamines derived from the nitro-Mannich reaction containing both a tosyl amide and a secondary amine could be regioselectively cyclised through the tosyl amide onto a pendant primary hydroxyl group to give piperazine (60–75% yields) or 1,4-diazepane (71% yield) ring systems under Mitsunobu conditions. For some substrates addition of Et3N·HCl encouraged regioselective cyclisation through the secondary amine leading to aziridine ring systems.
A zirconium(IV) complex of a bidentate Schiff base (ZrL2Cl2) has been synthesized by the reaction of (z)-N-benzylidene-2-hydroxypropane-1-amine (HL) and ZrCl4. Spectroscopic data and elemental analyses are consistent with a monomeric complex with a ligand:Zr ratio of 2:1. The catalytic activity of ZrL2Cl2 has been investigated for the efficient synthesis of a wide variety of quinoxaline derivatives under mild conditions. The employment of ethanol as an environmentally benign solvent in this high yield method, along with high turnover numbers and reusability of the catalyst providing ready scalability, makes it appropriate for practical applications.
Heterogeneous copper-catalyzed coupling of amines: a possible way for the preparation of imines
作者:Ágnes Magyar、Zoltán Hell
DOI:10.1007/s00706-016-1784-9
日期:2016.9
AbstractCopper(II) on 4-Å molecular sieves is an efficient catalyst for the preparation of imines from benzylamines under simple reaction conditions. No oxidative atmosphere or oxidizing agents are required. Preparative experiments showed that no aldehyde intermediate can be detected even under ambient atmospheric conditions. Graphical abstract
N,N-Dimethylphosphoramidic dichloride: a convenient reagent for the preparation of β-lactams from acetic acids and imines
作者:Fernando P Cossío、Iñaki Ganboa、Jesús M García、Begoña Lecea、C Palomo
DOI:10.1016/s0040-4039(00)96016-7
日期:1987.1
A convenient reagent for the preparation of β-lactams from aceticacids and imines is described. A new route to α-keto-β-lactams from 3-bis(ethylthio)β-lactams is also reported. Reaction of 4-acethyl-β-lactams with diazomethane is also made.
Anchored Palladium Complex‐Generated Clusters on Zirconia: Efficiency in Reductive
<i>N</i>
‐Alkylation of Amines with Carbonyl Compounds under Hydrogen Atmosphere
generation method of palladium clusters and catalytic reductive N-alkylation of amines with carbonyl compounds are reported. The active Pd species are formed by treatment of highly dispersed molecular palladiumcomplexes with atmospheric hydrogen, and the present catalyst system shows a broad substrate scope and functional group tolerance with respect to both amines and carbonyl compounds.