Azinium-N-(2′-azinyl)aminides: synthesis, structure and reactivity
作者:Rosa Carceller、Jose L. García-Navío、María L. Izquierdo、Julio Alvarez-Builla、Mariano Fajardo、Pilar Gómez-Sal、Federico Gago
DOI:10.1016/s0040-4020(01)90411-9
日期:1994.4
Several azinium-N-(2′-azinyl)aminides are reported. The structure of pyridinium-N-(2′-pyridyl)aminide has been studied, both in solution and in crystalline state, and results have been compared. In non-polar solvents, the aminides present a planar conformation stabilized by an intramolecular hydrogen bond. The reactivity toward electrophiles confirms the structural data, producing either N- or C- substitutions
Isoquinolinium N-arylimides and acetylenic dipolarophiles; cycloadducts and their rearrangements
作者:Klaus Bast、Tony Durst、Helmut Huber、Rolf Huisgen、Klaus Lindner、David S Stephenson、Robert Temme
DOI:10.1016/s0040-4020(98)00430-x
日期:1998.7
ones and does not require acidcatalysis; in some cases the initial adduct escapes 1H NMR observation. The products 11–17, obtained with ethyl phenylpropiolate, provide beautiful NMR models for steric interaction of benzo ring E and the 12-phenyl group. On treatment with strong acid, the pentacyclic rearrangement products suffer fragmentation; e.g., 11 furnishes 4-(o-aminophenyl)-isoquinoline and methyl
乙炔二甲基丙炔酸盐,和乙基苯基丙超越在dipolarophilic活动相应的烯属羧酸酯VS。异喹啉鎓N-芳基酰亚胺,一类甲亚胺亚胺。所述cycloadducts含有Ñ ß -vinylphenylhydrazine系统并进入一个Fischer吲哚合成,其停止所述吲哚中的一个步骤短。炔属双极性亲和剂的环加合物所涉及的[3.3]-σ重排同样快于烯属双极性亲和剂,并且不需要酸催化。在某些情况下,最初的加合物无法通过1 H NMR观察到。产品11–17用苯丙酸乙酯获得的,为苯并环E和12-苯基的空间相互作用提供了漂亮的NMR模型。用强酸处理时,五环重排产物会碎裂。例如,11在甲醇HCl中提供4-(邻氨基苯基)-异喹啉和苯甲酰乙酸甲酯。
Cycloadditions of isoquinolinium<i>N</i>-arylimides to enamines
作者:Rolf Huisgen、Tony Durst、Robert Temme
DOI:10.1002/jhet.5570350323
日期:1998.5
undergo cycloadditions to ethylene derivatives bearing either electron-withdrawing or electron-releasing substituents. The regiochemistry is bidirectional; electron-attracting substituents appear at the 1-position of the tricyclic adducts. Various enamines, however, adopt an orientation such that the amino function appears at the 2-position. The tricyclic adducts undergo an acid-catalyzed hyrazo rearrangement
Isoquinolinium<i>N</i>-arylimides and strained cycloalkenes
作者:Robert Temme、Rolf Huisgen
DOI:10.1002/jhet.5570350324
日期:1998.5
In contrast to common alkenes and enol ethers, the angle-strained double bonds of norbornene, dimethyl norbornadiene-2,3-dicarboxylate, and acenaphthylene undergo [3+2] cycloadditions with isoquinolinium N-arylimides. The structures of the crystalline adducts have been elucidated from their 1H nmr spectra.
与普通的烯烃和烯醇醚相反,降冰片烯,二甲基降冰片二烯-2,3-二羧酸和dimethyl烯的角应变双键与异喹啉N-芳基酰亚胺进行[3 + 2]环加成。结晶加合物的结构已从其1 H nmr光谱中阐明。
IsoquinoliniumN-Arylimides and Some Cycloadditions to Heterocumulenes
23 were obtained crystalline; in solution the latter equilibrates with the hexahydrotetrazine 24 as its dimer. The N-phenylimide 19 is not stable; an isolated solid appears to be a tetramer. Generated by deprotonation of 11−13, the N-arylimides 19−21 undergo in situ cycloadditions to carbondisulfide, phenyl isocyanate, phenyl isothiocyanate, and diphenylketene. The storable CS2 adduct 29 offers a neutral