Diverse Reactivity of Diazatitanacyclohexenes: Coupling Reactions of 2<i>H</i>-Azirines Mediated by Titanium(II)
作者:Addison N. Desnoyer、Xin Yi See、Ian A. Tonks
DOI:10.1021/acs.organomet.8b00522
日期:2018.12.10
observed products. Diazatitanacyclohexene 3, bearing phenyl substituents and derived from 2,3-diphenyl-2H-azirine, fragments to form an azabutadiene and nitrile, which is shown to be catalytic in the presence of excess 2,3-diphenyl-2H-azirine. H-substituted complex 8, derived from 3-phenyl-2H-azirine, decomposes via protonolysis of the Cp ligands. In contrast, the methyl-substituted diazatitanacyclohexene
2 H-叠氮基是N-杂环合成的多功能偶联伙伴。在本文中,我们介绍了我们对Cp 2 Ti(BTMSA)(1; BTMSA =双(三甲基甲硅烷基)乙炔)与多种叠氮基的反应性的研究。在所有检查的情况下,最初形成的有机金属产物都是重氮杂萘环己烯,大概是通过将Ti(II)氧化加成到叠氮基的C–N键中形成的,形成氮杂双环丁烯中间体,然后C═N插入第二等价的叠氮基进入Ti-C键形成观察到的产物。带有苯基取代基且衍生自2,3-二苯基-2 H的二氮杂异环己烯3-氮嗪,形成氮杂丁二烯和腈的片段,在过量的2,3-二苯基-2 H-氮嗪存在下具有催化作用。衍生自3-苯基-2 H-叠氮基的H-取代的配合物8通过Cp配体的质子分解而分解。相比之下,甲基取代diazatitanacyclohexene 10,由2-甲基-3-苯基-2衍生ħ -azirine,是耐热的。尝试用炔烃捕获假定的氮杂环丁烯环丁烯中间体失败,而是导