New benzimidazolium sulfonate salts have been prepared and fully characterized. They have been associated in situ with [RuCl2(p-cymene)]2 to generate efficient catalytic systems operating at 120 °C under neat conditions in the presence of potassium tert-butylate for selective N-alkylation of primary aromatic amines into secondary amines.
Synthesis of Quinoxaline-Linked Bis(Benzimidazolium) Salts and Their Catalytic Application in Palladium-Catalyzed Direct Arylation of Heteroarenes
作者:Murat Kaloğlu、Mehmet Hanifi Şahan、Serpil Demir Düşünceli、İsmail Özdemir
DOI:10.1007/s10562-021-03787-2
日期:2022.7
synthesized as bis-N-heterocyclic carbene (NHC) precursors. These bis(NHC) precursors were used as multidentate ligands for the construction of bi(hetero)aryls by palladium-catalyzed direct C-H activation process. The in situ prepared palladium complexes by mixtures of the Pd(OAc)2 and the bis(NHC) precursors were used as the catalyst for direct C-H activation of heteroarenes. These catalytic system exhibited
functionalized N-heterocycliccarbene ligand precursors were obtained from the compounds 1-alkylbenzimidazole, 1,3-propane sultone, and 1,4-butane sultone. These NHC ligand precursors were metallated with Ag2O on moderate conditions to give novel silver-NHC complexes. All new compounds were characterized by by 1H NMR, 13C NMR, FT-IR and elemental analysis techniques. The cytotoxic properties of the silver(I) complexes
在这项研究中,磺酸盐官能化的N-杂环卡宾配体前体是从化合物1-烷基苯并咪唑,1,3-丙烷磺酸内酯和1,4-丁烷磺酸内酯获得的。将这些NHC配体前体在中等条件下用Ag 2 O金属化,得到新颖的银-NHC络合物。所有新化合物均通过1 H NMR,13 C NMR,FT-IR和元素分析技术表征。已经在包括顺铂敏感和耐药细胞在内的各种人类癌症细胞系中评估了银(I)配合物的细胞毒性。这四种复合物的IC 50值是通过基于MTT的测定法在三种人类细胞系大脑(SHSY5Y)和肝脏(HEP3B)上测定的。这些银N杂环卡宾配合物已成为具有独特结构和功能的基于金属的癌症治疗剂。这些策略为发现新型金属药物提供了令人兴奋的机会。
Organocatalytic Synthesis of Benzimidazole Derivatives
作者:Elizabeth S. Lewkowicz、Leticia Lafuente、Lautaro G. Maidana、Juan A. Bisceglia、Adolfo M. Iribarren
DOI:10.1055/a-1911-6793
日期:2022.12
A synthetic route for the production of chiral derivatives of benzimidazole is presented. Different commercially available amines are evaluated as organocatalysts for the stereoselective aldol addition of N1-benzimidazolyl acetaldehyde, previously prepared by N-alkylation of benzimidazole, with cyclic ketones. When cyclohexanone was used, l-prolinamide proved to be the most efficient catalyst, giving
介绍了生产苯并咪唑手性衍生物的合成路线。评估了不同的市售胺作为有机催化剂用于N 1-苯并咪唑基乙醛的立体选择性醛醇加成,之前通过苯并咪唑的N-烷基化制备,与环状酮。当使用环己酮时,l-脯氨酰胺被证明是最有效的催化剂,得到 ( S )-2-(( R )-2-(1 H-苯并[ d ]咪唑-1-基)-1-羟乙基)环己酮,产率为 92%,产率为 90 % ee和 92:8 dr ( anti / syn )。
Synthesis of palladium complexes containing benzimidazole core and their catalytic activities in direct arylation of heteroaromatic species
作者:Sema Şeker、Öznur Doğan Ulu、Nevın Gürbüz、Namık Özdemır、İsmaıl Özdemır、Hakan Bülbül
DOI:10.1080/00958972.2024.2335629
日期:2024.3.3
Herein, we report the synthesis of four new palladium complexes containing a benzimidazole core and examine their catalyticactivities in the directarylation of heteroaromatic species with aryl br...