Some reactions of 2-(4-substitutedphenyl)-2-(<i>N</i>-methyl-<i>N</i>-4-substitutedbenzamido) acetic acids
作者:Yaşar Dürüst、Hamza Karakuş、Benson M. Kariuki、David W. Knight
DOI:10.1080/00397911.2018.1489966
日期:2018.9.2
benzamides and p-substituted benzoic acids. In addition, a novel and efficient access to N-acyl urea derivatives is described by the reaction between 2-(4-substitutedphenyl)-2-(N-methyl-N-4-substitutedbenzamido)acetic acids and cyclohexyl, isopropyl carbodiimides in the presence of a base. The structures of all new products were identified on the basis of NMR and IR spectra, along with X-ray diffraction data
摘要 2-(4-取代苯基)-2-(N-甲基-N-4-取代苯甲酰氨基)乙酸与乙酸酐在2-硝基亚甲基噻唑烷存在下原位生成2,4-二芳基取代的münchnones,后者是最有可能充当碱,并出乎意料地发生 Dakin-West 型反应和同时发生的自氧化反应,导致 (E)-1-(N,4-二甲基苯甲酰胺基)-1-(4-氟苯基)prop-1 的形成-en-2-yl 乙酸盐、4-取代苯基-N-甲基-N-(4-取代苯甲酰基)苯甲酰胺和对-取代苯甲酸。此外,通过 2-(4-取代苯基)-2-(N-甲基-N-4-取代苯甲酰氨基)乙酸与环己基、异丙基碳二亚胺之间的反应,描述了一种新颖且有效的获得 N-酰基脲衍生物的方法。一个基地的存在。所有新产品的结构均基于 NMR 和 IR 光谱以及 X 射线衍射数据和 HRMS 测量进行鉴定。图形概要
Push-pull 1,3-thiazolium-5-thiolates. Formation via concerted and stepwise pathways, and theoretical evaluation of NLO properties,
作者:David Cantillo、Martín Ávalos、Reyes Babiano、Pedro Cintas、José L. Jiménez、Mark E. Light、Juan C. Palacios、Valentín Rodríguez
DOI:10.1039/c0ob00416b
日期:——
The transformation of münchnones (mesoionic rings featuring the 1,3-oxazolium-5-olate core) into their sulfur counterparts (1,3-thiazolium-5-thiolates) by reaction with CS2, pioneered by Huisgen and his group in the early 1970s, has been re-investigated in detail by means of both experimental and theoretical methods. The synthetic strategy can be tuned to incorporate donor and acceptor groups in appropriate positions. Calculations of molecular hyperpolarizabilities together with orbital topologies evidence that these sulfur-containing heterocycles exhibit nonlinear optical responses, thereby pointing to potential applications of mesoionic structures in the NLO field. From a mechanistic viewpoint, modeling of the whole systems at the B3LYP/6-31G(d) level reveals that concerted and stepwise pathways are operative depending on the substitution pattern of the parent münchnone, which also account for the experimental results.