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
Lithium bis(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
在轻度羰基化条件下(0°C,1 atm一氧化碳),双(氨基甲酰基)锂锂(2)很容易衍生自仲胺,例如N-甲基苯胺,N-甲基苄胺和二乙胺,但二苯胺和苄基苯胺不适合作为起始材料。通过适当的处理,在醚中形成的氨基甲酰铜络合物2易于转化为相应的甲酰胺,草酰胺,氨基甲酸酯和草酰胺酸。的形成和稳定性2很大程度上取决于所使用的溶剂。溶剂(DME,THF和HMPA)的较高极性作用使2的稳定性降低,并导致在进一步反应中伴随释放出一氧化碳。发现钯催化剂对于2与碘苯或(E)-β-溴苯乙烯的交叉偶联反应是有效的。