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。
Photochemical regioselective C–H arylation of imidazo[1,2-<i>a</i>]pyridine derivatives using chlorophyll as a biocatalyst and diazonium salts
method for the arylation of imidazo[1,2-a]pyridine with diazonium salt derivatives and using chlorophyll as a biocatalyst via visible-light catalysis. Natural pigments such as chlorophyll are used as a green photosensitizer and an environmentally benign catalyst. The general and easy procedure provides a transition-metal-free alternative for the formation of 2,3-diaryl imidazo[1,2-a]pyridine derivatives
该通讯描述了一种温和的方法,用于用重氮盐衍生物芳基化咪唑并[1,2- a ]吡啶,并通过可见光催化使用叶绿素作为生物催化剂。叶绿素等天然色素被用作绿色光敏剂和对环境无害的催化剂。通用且简单的程序为在环境温度下以良好至极好的收率形成 2,3-二芳基咪唑并[1,2- a ] 吡啶衍生物提供了一种不含过渡金属的替代方案。