期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2020, 期 4, 页码 450-465出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201901622
关键词
Anionic NHCs; Betaines; Boron compounds; Carbenes; Cyclic borates; Imidazol-2-ylidene
资金
- Russian Ministry of Education and Science [4.6351.2017/8.9]
- Russian Foundation for Basic Research [17-03-01029]
- Deutscher Akademischer Austauschdienst DAAD
Reaction of N-alkylated imidazoles with 2-chloro-4-quinazolinone gave mesomeric betaines, 2-(1-alkyl-1H-imidazolium-3-yl)quinazolin-4-olates, for which three tautomeric forms of N-heterocyclic carbenes (NHCs) can be formulated, in addition to an anionic NHC after deprotonation. The NHC tautomers were trapped with sulfur, selenium, triethylborane, and triphenylborane as thiones, selenones and borane adducts, respectively. We obtained two isomers of the cyclic borane adducts, diazaboroloquinazolinones with [1,5-a] and [5,1-b]-type fusion between the quinazolinone and the diazaborole rings. They correspond to two different NHC tautomers and to the anionic NHC derived thereof. The third NHC tautomer was trapped as a non-cyclic adduct with tris(pentafluorophenyl)borane by coordination to the quinazoline oxygen atom. 2D H-1-N-15 HMBC experiments of N-15-labeled quinazolinone fragments, quantitative measurements of long-range H-1-N-15 coupling constants (J(HN)), and five X-ray single crystal analyses have been carried out for the structure elucidations and to gain insight into the NMR spectroscopic properties of these compounds.
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