[A] the compound having a ring structure and a novel method for synthesizing [...]. (I) a compound represented by the formula [a] [...]. (In the formula, Y is, (a)- (f) represents a divalent organic group represented by the formula. )[Drawing] no
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Paragraph 0037-0039
(2018/08/30)
Metal-Free Sequential C(sp2)-H/OH and C(sp3)-H Aminations of Nitrosoarenes and N-Heterocycles to Ring-Fused Imidazoles
Hydrogen bond assisted ortho-selective C(sp2)-H amination of nitrosoarenes and subsequent α-C(sp3)-H functionalization of aliphatic amines is achieved under metal-free conditions. The annulation of nitrosoarenes and 2-hydroxy-C-nitroso compounds with N-heterocycles provides a facile excess to a wide range of biologically relevant ring-fused benzimidazoles and structurally novel polycyclic imidazoles, respectively. Nucleophilic aromatic hydrogen substitution (SNArH) was found to be preferred over classical SNAr reaction during the C(sp2)-H amination of halogenated nitrosoarenes.
Purkait, Anisha,Roy, Subhra Kanti,Srivastava, Hemant Kumar,Jana, Chandan K.
supporting information
p. 2540 - 2543
(2017/05/24)
Functionalized orthoesters as powerful building blocks for the efficient preparation of heteroaromatic bicycles
By combining substituted anilines with functionalized orthoesters, an efficient and connective methodology for the preparation of benzoxazole, benzothiazole, and benzimidazole derivatives has been established. The versatility of this approach enables the development of new libraries of heterocycles containing multifunctional sites.
Bastug, Gulluzar,Eviolitte, Christophe,Markó, István E.
p. 3502 - 3505
(2012/08/08)
Methine dyes
The invention relates to a new class of pyrrolobenzimidazole, benzimidazoloisoquinoline and dipyrodinobenzodiimidazole in cyanine sensitizing dyes derived therefrom and their use in silver halide emulsions, and to methods for preparation of such new dyes.
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(2008/06/13)
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