Titanocene-Catalyzed Coupling of Aromatic Amides in the Presence of Organosilanes: A Novel Route to Vicinal Diamines and a New Class of Amine-Substituted Oligomers
作者:Kesamreddy Rangareddy、Kumaravel Selvakumar、John. F. Harrod
DOI:10.1021/jo049220b
日期:2004.10.1
starting materials, and in high yields. In addition, the coupling of 1,4- and 1,3-bis-(N,N,N‘,N‘-tetraalkyl)arylenediamides is shown, under the same experimental conditions, to yield oligomers: R2NC(O)C6H4CH(NR2)-[CH(NR2)C6H4CH(NR2)]n-CH(NR2)C6H4C(O)-NR2 (R = methyl and ethyl; n = 0 to ca. 5). The chemical structures of these unprecedented oligomers are determined by comparison of NMR and MS spectra to
已经针对多种具有不同取代模式的底物对标题反应进行了调查。除少数例外,该方法可从广泛获得的廉价原料中一锅法合成1,2-二胺。此外,1,4-和1,3-双-耦合器(Ñ,Ñ,Ñ “ Ñ ” -tetraalkyl)arylenediamides所示,在相同的实验条件下,得到低聚物,R 2 NC(O) C 6 H 4 CH(NR 2)-[CH(NR 2)C 6 H 4 CH(NR 2)] n -CH(NR 2)C 6 H 4 C(O)-NR 2(R =甲基和乙基;n= 0至约5)。通过将NMR和MS光谱与由类似的N,N-二烷基苯甲酰胺制备的邻位二胺的化学光谱进行比较,可以确定这些前所未有的低聚物的化学结构。限制低聚物链长的根源可能是由于内部苄基胺基团的特殊作用,因为发现底物4-Me 2 NCH 2 C 6 H 4 C(O)NMe 2与另一个4-取代的N,N研究了-二烷基苯甲酰胺。简要研究了N-甲基邻