Quantification of Nitrate−π Interactions and Selective Transport of Nitrate Using Calix[4]pyrroles with Two Aromatic Walls
摘要:
Herein we disclose the results investigations regarding the interactions between the biologically relevant nitrate oxoanion and several "two-wall" aryl-extended calix[4]pyrroles. There exists a clear relationship between the electronic nature of the aromatic walls of the calix[4]pyrroles and the stability of the nitrate subset of calix[4]pyrrole complex. This suggests that NO3--pi interactions have an important electrostatic component. We provide energetic estimates for the interaction of nitrate with several phenyl derivatives. Additionally, we report solid-state evidence for a preferred binding geometry of the nitrate anion included in the calix[4]pyrroles. Finally, the "two-wall" aryl-extended calix[4]-pyrroles show excellent activity in ion transport through lipid-based lamellar membranes. Notably the best anion transporters are highly selective for transport of nitrate over other anions.
金催化单hydroarylation和炔烃的两倍hydroarylation与富电子杂芳烃用分析11 H NMR动力学研究。对于降低的炔烃浓度获得的速率常数提供了关于该加成反应的反应性的信息。检验显示出两个反应步骤中金和质子的正交反应性。第一次氢芳基化仅由金(I)促进,而第二步以质子为前提,该质子可逆地衍生自末端炔烃形成的σ,π-乙炔化物络合物或与溶剂相互作用。根据动力学数据,有可能以中等到良好的产率合成各种单加合物,此外,还探索了带有两个不同取代基的杂二加合物的合成。
introduces a Pd(II)/LA-catalyzed (LA: Lewis acid) decarboxylative addition reaction for the synthesis of bis(indolyl)methanederivatives. The presence of Lewis acid such as Sc(OTf)3 triggered Pd(II)-catalyzed decarboxylative addition of propiolic acids with indoles to offer the bis(indolyl)methanederivatives in moderate to good yields, whereas neither Pd(II) nor Lewis acid alone was active for this synthesis
Double hydroarylation of alkynes with heteroarenes under mild conditions catalyzed by Au(i) are now reported.
烯烃与杂环芳烃在温和条件下通过Au(i)催化进行双重氢化芳基化反应的研究结果现已报告。
A Stiboranyl Platinum Triflate Complex as an Electrophilic Catalyst
作者:Di You、Jesse E. Smith、Srobona Sen、François P. Gabbaï
DOI:10.1021/acs.organomet.0c00193
日期:2020.12.14
([(o-(R2P)C6H4)2SbCl2]PtCl (R = Ph, iPr)) with 3 equiv of AgOTf. The crystalstructures of 2 and 4 confirmed that the chloride ligands have been fully substituted by more labile triflate ligands. Despite structural similarities in the dinuclear cores of 2 and 4, only 2 acts as a potent carbophilic catalyst in enyne cyclization reactions. The high activity of 2 is also reflected by its ability to promote
Addition of pyrroles onto terminal alkynes catalyzed by a dinuclear ruthenium (II) complex
作者:Sze Tat Tan、Yew Chin Teo、Wai Yip Fan
DOI:10.1016/j.jorganchem.2012.02.017
日期:2012.6
alkynes has been catalyzed by a dinuclear rutheniumcomplex, Ru2(CO)4(PPh3)2Br4, resulting in the formation of geminal 2-vinylpyrroles in high yields under mild conditions. Further functionalization with pyrroles or alkynes to afford dipyrrolmethanes or 2,5-bis(vinyl)pyrroles via the vinyl functional group can readily be achieved. A mechanism involving cationic rutheniumcomplexes was proposed based
Utility of dipyrromethane in the synthesis of some new A2B2 porphyrin and their related porphyrin like derivatives with their evaluation as antimicrobial and antioxidant agents
作者:Ahmed A. Fadda、Eman El-Gendy、Hala M. Refat、Eman H. Tawfik
DOI:10.1016/j.dyepig.2020.109008
日期:2021.7
afforded some new porphyrin like and A2B2 porphyrin derivatives 4a-g and 5a-d, respectively. Biological evaluation of the newly synthesized compounds 4a-g and 5a-d showed promising activity as antimicrobial and antioxidant agents. Compounds 4c,4e,4g,5c, and 5d exhibited the highest antimicrobial activity, whereas, compounds 4a,4f,5a,5b, and 5d recorded the highest antioxidant activity.
在这项工作中,在室温和无溶剂条件下,由醛和过量的吡咯合成了二吡咯甲烷衍生物2a,b。二吡咯甲烷2a,b与不同的芳族醛在盐酸或对甲苯磺酸作为催化剂的存在下反应,分别得到一些新的卟啉类和A 2 B 2卟啉衍生物4a-g和5a-d。对新合成的化合物4a-g和5a-d的生物学评估显示,其具有抗微生物和抗氧化剂作用。化合物4c,4e,4g,5c和5d表现出最高的抗菌活性,而化合物4a,4f,5a,5b和5d表现出最高的抗氧化活性。