Sulfonic acid supported on hydroxyapatite-encapsulated-γ-Fe2O3 nanocrystallites as a magnetically separable catalyst for one-pot reductive amination of carbonyl compounds
A novel, environmentally friendly procedure has been developed for the preparation of secondary or tertiary amines by one-pot reductive amination of carbonyl compounds using sodium borohydride in the presence of a magnetically recoverable sulfonic acid supported on hydroxyapatite-encapsulated-γ-Fe2O3 [γ-Fe2O3@HAP-SO3H] at room temperature. The catalyst was easily separated from the reaction mixture by applying an external magnet and reused for six cycles without significant loss of catalytic activity.
Matrix interference ions in low mass range has always been a concern when using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) to analyze small molecules (<500 Da). In this work, a novel matrix, N1,N4-dibenzylidenebenzene-1,4-diamine (DBDA) was synthesized for the analyses of small molecules by negativeion MALDI-TOF MS. Notably, only neat ions ([M–H]-) of fatty
Iron-Catalyzed Hydrogen Transfer Reduction of Nitroarenes with Alcohols: Synthesis of Imines and Aza Heterocycles
作者:Jiajun Wu、Christophe Darcel
DOI:10.1021/acs.joc.0c02505
日期:2021.1.1
A straightforward and selective reduction of nitroarenes with various alcohols was efficiently developed using an iron catalyst via a hydrogentransfer methodology. This protocol led specifically to imines in 30–91% yields, with a good functional group tolerance. Noticeably, starting from o-nitroaniline derivatives, in the presence of alcohols, benzimidazoles can be obtained in 64–72% yields when the
Titania-supported iridiumcatalysts which enable the synthesis of benzimidazoles from 2-nitroaniline and primary alcohols under mild conditions have been developed. The iridiumcatalysts supported on 010}/101}-faceted anatase (PA-135-3.5) showed the excellent activity in spite of their moderate surface areas, while there is a positive correlation between BET surface area and the activity of iridium catalysts
Preparation of Imines by Oxidative Coupling of Benzyl Alcohols with Amines Catalysed by Dicopper Complexes
作者:Yung-Syuan Lan、Bei-Sih Liao、Yi-Hong Liu、Shie-Ming Peng、Shiuh-Tzung Liu
DOI:10.1002/ejoc.201300507
日期:2013.8
Complexation of 2,7-bis(2-pyridyl)-1,8-naphthyridine (bpnp) with Cu2O in formic acid under aerobic conditions provided a dicoppercomplex [Cu2(bpnp)(μ-OH)(HCOO)3] (1). This complex has been characterized by X-ray crystallographic and spectroscopic analysis. With O2 as the oxidant, complex 1 is an efficient catalyst for the oxidativecoupling of alcohols with amines or diamines, leading to the corresponding