<i>N</i>-Methylation and Trideuteromethylation of Amines via Magnesium-Catalyzed Reduction of Cyclic and Linear Carbamates
作者:Marc Magre、Marcin Szewczyk、Magnus Rueping
DOI:10.1021/acs.orglett.0c00988
日期:2020.4.17
A new reduction of carbamates to N-methyl amines is presented. The magnesium-catalyzed reduction reaction allows the conversion of cyclic and linear carbamates, including N-Boc protected amines, into the corresponding N-methyl amines and amino alcohols which are of significant interest due to their presence in many biologically active molecules. Furthermore, the reduction can be extended to the formation
N,N-disubstituted lithium bis(carbamoyl)cuprate. A convenient complex for one-pot conversions of amines to formamides, oxamides, carbamates, and oxamic acids
作者:Yoshiaki Wakita、Shun-Ya Noma、Minoru Maeda、Masaharu Kojima
DOI:10.1016/0022-328x(85)80441-1
日期:1985.12
Lithiumbis(carbamoyl)cuprates (2) were readily derived from secondary amines such as N-methylaniline, N-methylbenzylamine, and diethylamine, under mild carbonylation conditions (0°C, 1 atm of carbon monoxide), but diphenylamine and benzylphenylamine were unsuitable as the starting materials. The carbamoylcopper complexes 2 formed in ether were readily converted to the corresponding formamides, oxamides
Divergent synthesis of carbamates and <i>N</i>-methyl carbamates from dimethyl carbonate and nitroarenes with Mo(CO)<sub>6</sub> as a multiple promoter
Dialkyl carbonates are green and versatile reagents that can be used in alkylation and alkoxycarbonylation reactions. Herein, we disclosed a reductive methoxycarbonylation of aromatic nitro compounds with dimethyl carbonate for the construction of diverse carbamates and N-methyl carbamates. Using Mo(CO)6 as a multiple promoter, different nitroarenes were smoothly transformed into the corresponding
碳酸二烷基酯是绿色多功能试剂,可用于烷基化和烷氧基羰基化反应。在此,我们公开了芳香族硝基化合物与碳酸二甲酯的还原甲氧基羰基化反应,用于构建多种氨基甲酸酯和N-甲基氨基甲酸酯。使用Mo(CO) 6作为多重促进剂,使用DMC作为溶剂和试剂,不同的硝基芳烃顺利转化为相应的氨基甲酸酯,产率在27%至94%之间。值得注意的是,不同碱的选择可以控制所需的产物:K 3 PO 4有利于形成氨基甲酸酯作为主要产物,而DBU则促进N-甲基氨基甲酸酯作为主要产物的形成。