To successively construct two amide bonds between two benzene rings, the reaction of methyl N-alkylanthranilate and N-alkylisatoic anhydride in the presence of a base was studied. When the reaction was carried out with lithium hexamethyldisilazide and N,N,N′,N′-tetramethylethylenediamine in THF at 70 °C under reduced pressure, a cyclic diamide was obtained in high yield.
为了在两个苯环之间连续生成两个酰胺键,我们研究了 N-烷基黄原酸甲酯和 N-烷基异酸酐在碱存在下的反应。在 70 °C 减压条件下,用六甲基二硅氮化锂和 N,N,N′,N′-四甲基乙二胺在 THF 中进行反应,可获得高产率的环状二酰胺。
Experimental and Theoretical Studies of the Dimerizations of Imidoylketenes
作者:Chun Zhou、David M. Birney
DOI:10.1021/jo035128o
日期:2004.1.1
Reaction conditions are presented that, for the first time, allow the generation and dimerization of N-alkylimidoylketenes, e.g. ,1d, while avoiding the intramolecularrearrangements observed under conventional conditions. The dimer of 1d (22a) is the result of [4 + 2] cycloaddition across the CC bond of one ketene. In contrast, the N−H imidoylketene 1c dimerizes across the CO bond to form 24b. Furthermore