Synthesis of 6-Azaspiro[4.3]alkanes: Innovative Scaffolds for Drug Discovery
作者:Bohdan A. Chalyk、Andrei A. Isakov、Maryna V. Butko、Kateryna V. Hrebeniuk、Olena V. Savych、Olexandr V. Kucher、Konstantin S. Gavrilenko、Tetiana V. Druzhenko、Vladimir S. Yarmolchuk、Sergey Zozulya、Pavel K. Mykhailiuk
DOI:10.1002/ejoc.201700536
日期:2017.8.24
New scaffolds for drugdiscovery, 6-azaspiro[4.3]alkanes, have been synthesized in two steps from four-membered-ring ketones: cyclobutanone, thienone, N-Boc-azetidinone (Boc = tert-butoxycarbonyl), etc. The key transformation was the reaction between electron-deficient exocyclic alkenes and an in-situ generated N-benzylazomethine ylide.
A mild and reproducible method for the formation of a nonstabilized azomethine ylide was developed by photoinduced reaction catalyzed with eosin Y under green light irradiation. Resulting 1,3-dipole was trapped with fluoroalkenes, fluoroalkylated alkenes, and representative dipolarophiles to access pyrrolidine scaffolds, including spirocyclic compounds. The mechanism involved in this transformation
Photochemical Decarbonylation of Oxetanone and Azetidinone: Spectroscopy, Computational Models, and Synthetic Applications**
作者:Manvendra Singh、Pawan Dhote、Daniel R. Johnson、Samuel Figueroa‐Lazú、Christopher G. Elles、Zarko Boskovic
DOI:10.1002/anie.202215856
日期:2023.1.16
Upon irradiation with UV light, strained heterocyclic ketones expel carbon monoxide through a Norrish type I mechanism. Ylides formed in this way cyclize with a variety of double bonds.
在紫外线照射下,应变杂环酮通过 Norrish I 型机制排出一氧化碳。以这种方式形成的叶立德与多种双键环化。