Resolution of methyl-1-phenylethylamines by acidic derivatives of 1-phenylethylamine
摘要:
Methyl-1-phenylethylamines were resolved by phenylethylamine derivatives formed with a homologous series of dicarboxylic acids. The structure of the 4-methyl-1-phenylethyl amine N-(1-phenylethylamine) succinic acid monoamide diastereoisomeric salt was investigated by single crystal X-ray diffraction. (C) 2004 Elsevier Ltd. All rights reserved.
Enantiomerically pure amines by a new method: biotransformation of oxalamic esters using the lipase from Candida antarctica
作者:Daniel T. Chapman、David H. G. Crout、Mahmoud Mahmoudian、David I. C. Scopes、Paul W. Smith
DOI:10.1039/cc9960002415
日期:——
Octyl oxalamic esters of 1-phenylethylamine and substituted 1-phenylethylamines are kinetically resolved with high stereoselectivity by lipase B from Candida antarctica.
A silver-catalyzed efficient and direct C-H carbamoylation of quinolines with oxamic acids to access carbamoylated quinolines has been developed through oxidative decarboxylation reaction. The reaction proceeds smoothly over a broad range of substrates with excellent functional group tolerance and excellent yields under mild conditions.
The generation of carbamoyl radicals, followed by their addition to heteroarenes, was performed under mild conditions through a metal-free photocatalyzed decarboxylation of oxamic acids. The process has been applied to the carbamoylation of heteroaromatic bases using α-aminoacid-derived oxamic acids, leading to the corresponding amides without racemization.
based on a photocatalyzed oxidative decarboxylation of oxamic acids is described. The reaction includes in situ generation of an isocyanate from the oxamic acid, using an organic dye as a photocatalyst, a hypervalent iodine reagent as an oxidant and a light source, which trigger the free-radical decarboxylation. This protocol successfully avoids the isolation, purification and storage of carcinogenic
Photocatalyzed decarboxylation of oxamic acids under near-infrared conditions
作者:Ikechukwu Martin Ogbu、Dario M. Bassani、Frédéric Robert、Yannick Landais
DOI:10.1039/d2cc03155h
日期:——
Photocatalyzed oxidative decarboxylation of oxamic acids under near-infrared irradiation using Os(bptpy)2(PF6)2 as catalyst is reported. The reaction was applied to the synthesis of urethanes and heterocyclic amides. Mechanistic studies and comparative penetration depths between the NIR and the visiblelight mediated processes are discussed.