imidazoheterocycles has been developed through sp2 C–Hbondfunctionalization with molecular iodine in water at room temperature. The reaction is catalyzed by an imidazole-based zwitterion-type molten salt. A library of iodo-substituted imidazo[1,2-a]pyridines with broad functionality have been synthesized. This methodology is also applicable to imidazo[2,1-b]thiazole and imidazole scaffolds. An environmentally
摘要 通过室温下水中的分子碘与sp 2 C–H键的官能化作用,开发了咪唑杂环杂环碘化的环境友好方案。该反应由基于咪唑的两性离子型熔融盐催化。已经合成了具有广泛功能的碘取代的咪唑并[1,2- a ]吡啶的文库。该方法学也适用于咪唑并[2,1- b ]噻唑和咪唑支架。 通过室温下水中的分子碘与sp 2 C–H键的官能化作用,开发了咪唑杂环杂环碘化的环境友好方案。该反应由基于咪唑的两性离子型熔融盐催化。已经合成了具有广泛功能的碘取代的咪唑并[1,2- a ]吡啶的文库。该方法学也适用于咪唑并[2,1- b ]噻唑和咪唑支架。
Palladium-catalyzed oxidative C–H/C–H cross-coupling of imidazopyridines with azoles
An effective palladium-catalyzed oxidative C–H/C–H cross-coupling of imidazopyridines with azoles using air as the oxidant has been developed. This protocol provides a straightforward and operationally simple method for the synthesis of 3-azolyl-imidazopyridines in moderate to good yields and with good functional group tolerance. The biological evaluation revealed that the newly synthesized compounds
Metal-free C–H arylation of imidazoheterocycles with aryl hydrazines
作者:Sourav Jana、Sadhanendu Samanta、Avik K. Bagdi、Valerii Z. Shirinian、Alakananda Hajra
DOI:10.1039/c8ra01474d
日期:——
A simple and efficient metal-freearylation of imidazo[1,2-a]pyridines at the C-3 position with arylhydrazine has been achieved at room temperature under ambient air conditions. Various 2,3-disubstituted imidazopyridines and imidazothiazoles were synthesized with high yields. The present methodology demonstrates the usefulness of commercially available aryl hydrazine as an arylating agent.
在室温和环境空气条件下,已经实现了在 C-3 位的咪唑并[1,2- a ]吡啶与芳基肼的简单有效的无金属芳基化。以高产率合成了各种 2,3-二取代的咪唑并吡啶和咪唑噻唑。本方法证明了可商购的芳基肼作为芳基化剂的有用性。
Palladium-Catalyzed α-Selective Alkenylation of Imidazo[1,2-<i>a</i>]pyridines through Aerobic Cross-Dehydrogenative Coupling Reaction
The palladium-catalyzed highly regioselective vinylation of imidazopyridines through a cross-dehydrogenativecoupling reaction was developed. The reaction proceeds with the aid of molecular oxygen as the sole oxidant. A series of branched α-vinylated products were obtained with high efficiency.
A simple and practical method has been developed for the regioselective nitrosylation of imidazopyridines via C(sp2)–H bond functionalization using tert-butyl nitrite under mild reaction conditions.