取代基的交互作用对取代的亚苄基苯胺中C N桥基的电子特性的影响-介晶化合物分子核的模型。甲13 C NMR研究和比较与理论结果
摘要:
在CDCl 3中,对一系列介晶分子模型化合物(即C 13)测量了13 C NMR化学位移δC (C N)。取代的亚苄基苯胺p -X C 6 H 4 CH NC 6 H 4 p -Y(X = NO 2,CN,CF 3,F,Cl,H,Me,MeO或NMe 2; Y = NO 2,CN ,F,Cl,H,Me,MeO或NMe 2)。δ的取代基依赖性Ç(CN)被用作研究电子取代基对偶氮甲碱单元的作用的工具。亚苄基取代基X有δ的反向效应Ç(C N):吸电子原因屏蔽的取代基,而给电子性的人的行为相反,感应效果清楚地在共振效应为主。相反,苯胺取代基Y发挥正常作用:吸电子取代基引起屏蔽,而供电子取代基引起C N碳屏蔽,感应效应和共振效应的强度非常相似。此外,可以验证X和Y之间是否存在特定的交叉相互作用。相邻芳环取代基的电子效应可系统地改变C的灵敏度N基团对亚苄基或苯胺环取代基的电子作用。吸电子苯胺环上的取代基降低δ的灵敏度Ç(C
acyl-based carbanion equivalents. We herein report an alternative strategy that is based on the use of aldehydes as alkyl carbanion equivalents in a reductive coupling with aryl imines. A wide array of secondary amines can be synthesized in moderate to high yields. This reaction is mediated by hydrazine and catalyzed by ruthenium(II) complexes, and it tolerates various functional groups, such as esters, amides
Cation radical induced cycloaddition reaction between aryl imines and ethyl diazoacetate
作者:Congde Huo、Chougu Sun、Dongcheng Hu、Xiaodong Jia、Xiaolan Xu、Zhongli Liu
DOI:10.1016/j.tetlet.2011.10.121
日期:2011.12
The reaction of ethyldiazoacetate with aryl imines can be initiated by persistent cation radical salt tris(4-bromophenyl)aminium hexachloroantimonate, giving exclusively cis-aziridine carboxylates.
the preparation of a variety of biologically interesting amido (thio)xanthates has been developed. By the proper choice of a potassium (thio)xanthate salt, a cyclic or acyclic imine, and an acyl chloride as substrates a broad scope with respect to the substituents can be realized. This operationally simple one-pot method proceeds under mild and environmentally friendly conditions while potassium chloride
One-pot synthesis of pyrrolidino- and piperidinoquinolinones by three-component aza-Diels–Alder reactions of in situ generated N-arylimines and cyclic enamides
作者:Wenxue Zhang、Yisi Dai、Xuerui Wang、Wei Zhang
DOI:10.1016/j.tetlet.2011.09.021
日期:2011.11
An efficient synthesis of hexahydropyrrolo[3,2-c]quinolin-2-ones and hexahydropyridino[3,2-c]quinolin-2-ones has been developed in moderate to high yields by one-pot two-step aza-Diels-Alder reactions of N-arylimines, formed in situ from anilines and benzaldehydes, with cyclic enamides, formed in situ from 5-hydroxypyrrolidin-2-ones and 6-hydroxypiperidin-2-ones by BF3 center dot OEt2-promoted dehydration in dichloromethane at room temperature. The hexahydropyrrolo[3,2-c]quinolin-2-ones were formed as a single exo-stereoisomer in most cases and hexahydropyridino[3,2-c]quinolin-2-ones were formed as a mixture of exo- and endo-isomers favoring the endo-diastereomer. (C) 2011 Elsevier Ltd. All rights reserved.
Katiyar, Sarvagya S.; Lalithambika, M., Zeitschrift fur Physikalische Chemie (Leipzig), 1982, vol. 263, # 5, p. 961 - 973