By ligand, TEMPO, and base screening, we developed a mild and green one-pot imine synthesis from alcohols and amines via a low-loading palladium-catalyzed tandem aerobic alcohol oxidation-dehydrative condensation reaction that can be readily carried out in open air at room temperature.
Preparations of Secondary Amines and .beta.-Amino Esters via Additions of Grignard and Reformatsky Reagents to Imines and by One-Pot Reactions of Primary Amines, Aldehydes, and Grignards
作者:Alan R. Katritzky、Qingmei Hong、Zhijun Yang
DOI:10.1021/jo00116a027
日期:1995.6
Additions oi. Grignard and Reformatsky reagents to imines in the presence of 1-(trimethylsilyl)benzotriazole afforded in good yields the corresponding secondary amines and p-amino esters. The procedure is general as imines containing hydrogens a to both carbon and nitrogen can be employed. Extensions of this method to include imines containing other Lewis basic centers, e.g., those derived from furan-, thiophene-, indole-, and p-methoxybenzenecarboxaldehyde, have been successful in avoiding the potential complications which could result from the use of a Lewis acid as the activating : species. The imines need not be isolated, and a one-pot method for the synthesis of secondary amines from aldehydes, primary amines, and Grignard reagents is described.
Synthesis and Antibacterial Activity of Aromatic and Heteroaromatic Amino Alcohols
作者:Camila G. de Almeida、Samira G. Reis、Angelina M. de Almeida、Claudio G. Diniz、Vânia L. da Silva、Mireille Le Hyaric
DOI:10.1111/j.1747-0285.2011.01231.x
日期:2011.11
Two series of aromatic and heteroaromatic amino alcohols were synthesized from alcohols and aldehydes and evaluated for their antibacterial activities. All the octylated compounds displayed a better activity against the four bacteria tested when evaluated by the agar diffusion method and were selected for the evaluation of minimal inhibitory concentration. The best results were obtained for p‐octyloxybenzyl derivatives against Staphylococcus epidermidis (minimal inhibitory concentrations = 32 μm).
Furan containing ammonium salts from furfural: synthesis and properties evaluation
Furan-containing quaternaryammonium iodides, bis(trifluoromethane)sulfonimides, and tetrafluoroborates are obtained in good overall yield with mild operation conditions starting from furfural, a cheap chemical substance obtainable from crop residue feedstocks. The application of these new ion pairs can be envisioned in the fields of ionic liquid solvents, of surfactants and of biocides in analogy