Iodine-Mediated Difunctionalization of Imidazopyridines with Sodium Sulfinates: Synthesis of Sulfones and Sulfides
作者:Yu-Jing Guo、Shuai Lu、Lu-Lu Tian、En-Ling Huang、Xin-Qi Hao、Xinju Zhu、Tian Shao、Mao-Ping Song
DOI:10.1021/acs.joc.7b02734
日期:2018.1.5
Novel iodine-induced sulfonylation and sulfenylation of imidazopyridines have been described using sodium sulfinates as the sulfur source. This strategy enables highly selective difunctionalization of imidazo[1,2-a]pyridine to access sulfones and sulfides in good yields. A wide range of substrates and functional groups were well-tolerated under optimized conditions. Moreover, control experiments have
已经描述了使用亚磺酸钠作为硫源的新的碘诱导的咪唑并吡啶的磺酰化和亚磺酰化。该策略能够使咪唑并[1,2- a ]吡啶高度选择性地进行双官能化,从而以高收率获得砜和硫化物。在最佳条件下,各种底物和官能团均具有良好的耐受性。此外,已经进行了对照实验,表明了反应机理中涉及的自由基途径。
Electrochemical-Induced Transfer Hydrogenation of Imidazopyridines with Secondary Amine as Hydrogen Donor
作者:Jiangwei Wen、Hongyun Qin、Kelu Yan、Xiaoting Yang、Xuejun Sun、Wei Wei、Jianjing Yang、Hua Wang
DOI:10.1021/acs.orglett.0c03205
日期:2020.11.20
Electrochemical-induced transferhydrogenation (TH) of N-heteroaromatic to construct biologically active functional molecule is an appealing and yet challenging task. We report herein the first selective transferhydrogenation of imidazopyridine derivatives with secondary amines as the hydrogen donors under electrochemical conditions. The successful conversion of cathode transferhydrogenation depends on the
Palladium-catalyzed annulation of imidazo[1,2-a]pyridines with coumarins provided benzofuran fused transannulated products in good to excellent yields via a decarbonylative approach, while imidazo[1,2-a]pyridines with N-methyl indoles in the presence of palladium and base yielded conjugated imidazopyridine fused indole derivatives. Additional experiments revealed that the presence of the phenyl ring
钯催化的咪唑并[1,2- a ]吡啶与香豆素的环化反应通过脱羰方法提供了苯并呋喃稠合的环环化产物,而咪唑并[1,2- a ]吡啶与N-甲基吲哚在钯和碱产生共轭咪唑并吡啶稠合吲哚衍生物。进一步的实验表明,在咪唑并[1,2- a的 C-2 位存在苯环]吡啶对环化比烷基更重要。两种转变都遵循 Pd 催化的双 C-H 键活化的离子机制。所有的环状产品都显示出高荧光特性,并评估了它们的光物理特性。
Dual role of p-tosylchloride: copper-catalyzed sulfenylation and metal free methylthiolation of imidazo[1,2-a]pyridines
imidazo[1,2-a]pyridines using p-tosylchloride as a benign source of sulfenylating agents has been developed. On the other hand, p-tosylchloride mediated thiomethylation of imidazo[1,2-a]pyridines with dimethylsulfoxide as a source of thiomethylation under metal-free conditions was also described.
已经开发了使用对甲苯磺酰氯作为亚磺化剂的良性来源的咪唑并[1,2- a ]吡啶的铜催化的区域选择性C-3亚磺酰基化。另一方面,还描述了在无金属条件下,对甲苯磺酰氯介导的咪唑并[1,2- a ]吡啶的硫甲基化,其中使用二甲基亚砜作为硫甲基化的来源。
Electrochemical Oxidative Regioselective C–H Cyanation of Imidazo[1,2-<i>a</i>]pyridines
作者:Ting Cui、Yanling Zhan、Changhui Dai、Jun Lin、Ping Liu、Peipei Sun
DOI:10.1021/acs.joc.0c03026
日期:2021.11.19
Electrochemical oxidative regioselective C–H cyanation of imidazo[1,2-a]pyridines was developed using readily available TMSCN as the cyano source. The KH2PO4/K2HPO4 buffer was essential for this transformation. This protocol was compatible with a broad range of substituted imidazo[1,2-a]pyridines and provided the C3 cyanated products in moderate to excellent yields.
咪唑并[1,2- a ]吡啶的电化学氧化区域选择性C-H氰化是使用现成的TMSCN作为氰基源开发的。KH 2 PO 4 /K 2 HPO 4缓冲液对于这种转化是必不可少的。该方案与多种取代的咪唑并[1,2- a ]吡啶兼容,并以中等至优异的产率提供C3氰化产物。