Stereochemical Study on 1,3-Dipolar Cycloaddition Reactions of Heteroaromatic<i>N</i>-Ylides with Symmetrically Substituted cis and trans Olefins
作者:Otohiko Tsuge、Shuji Kanemasa、Shigeori Takenaka
DOI:10.1246/bcsj.58.3137
日期:1985.11
Stereochemistry of the cycloadditions of twenty-four heteroaromatic N-ylides with several symmetrically substituted cis and trans olefins has been investigated. Cyclic and acyclic cis olefins cycloadd to the and form of the ylides in a highly endo-selective manner giving almost quantitative yields of stereospecific endo 3+2 cycloadducts. N-Ylides stabilized with a substituent of carbonyl type react
A series of 1,2-dihydronaphtho[2,1-b]furan derivatives were synthesized by cyclizing 1-(aryl/alkyl(arylthio)methyl)-naphthalen-2-ol and pyridinium bromides in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in very good yield. The synthesized compounds were evaluated for their anti-proliferative potential against human triple negative MDA-MB-468 and MCF-7 breast cancer cells and non-cancerous
在1,8-二氮杂双环存在下,通过环化1-(芳基/烷基(芳硫基)甲基)-萘-2-醇和溴化吡啶鎓,合成了一系列1,2-二氢萘并[2,1- b ]呋喃衍生物[5.4.0]十一碳7烯(DBU)的收率非常好。使用MTT实验评估了合成的化合物对人三阴性MDA-MB-468和MCF-7乳腺癌细胞以及非癌性WI-38细胞(肺成纤维细胞)的抗增殖潜力。在21种合成化合物中,三种化合物(3a,3b和3 s)显示出有希望的抗癌潜力,并且根据一些生化和微观实验的结果,发现化合物3b具有最佳的抗增殖活性。
Versatile synthesis of chiral 6-oxoverdazyl radical ligands – new building blocks for multifunctional molecule-based magnets
作者:Atena B. Solea、Tobie Wohlhauser、Parisa Abbasi、Yvan Mongbanziama、Aurelien Crochet、Katharina M. Fromm、Ghenadie Novitchi、Cyrille Train、Melanie Pilkington、Olimpia Mamula
DOI:10.1039/c8dt00840j
日期:——
A versatile synthetic methodology to access the first family of chiral verdazyl N,N′-chelate ligands is described and exemplified by N,N′-dimethyl-, N,N′-di-isopropyl- and N,N′-diphenyl oxoverdazyls bearing two isomers of the pinene-pyridine functional group. Their physical properties were probed by X-band EPR spectroscopy, cyclic voltammetry and DFT calculations. Preliminary reactivity studies show
Reusable Supported Pyridine-Mediated Cascade Synthesis of <i>trans</i>-2,3-Dihydroindoles via In Situ-Generated <i>N</i>-Ylide
作者:Anshul Jain、Anitta Regina、Akanksha Kumari、Ranjan Patra、Manikandan Paranjothy、Nirmal K. Rana
DOI:10.1021/acs.orglett.3c01295
日期:2023.5.26
Merrifield resin-anchored pyridines were prepared and applied as reusable mediators for trans-selective cascade synthesis of 2,3-dihydroindoles. The developed approach relied on in situ N-ylide formation followed by Michael substitution reactions. The cascade reaction was also carried out efficiently with simple pyridine. The products were further transformed into synthetically valuable compounds,
Pyridinium Ylide-Mediated Diastereoselective Synthesis of Spirocyclopropanyl-pyrazolones via Cascade Michael/Substitution Reaction
作者:Akanksha Kumari、Dhirajkumar Jitendrabhai Patanvadiya、Anshul Jain、Ranjan Patra、Manikandan Paranjothy、Nirmal K. Rana
DOI:10.1021/acs.joc.3c02879
日期:2024.6.7
We have devised a highly diastereoselective formal [2 + 1] annulation reaction of arylidene/alkylidine-pyrazolones with in situ-generated supported as well as standard pyridinium ylides to construct spirocyclopropanyl-pyrazolones. The cascade approach exhibits a wide range of functional group tolerance, gram-scale capability, and substrate versatility. A diverse range of spirocyclic cyclopropanes was