Iridium- and Rhodium-Catalyzed Carbocyclization between 2-Phenylimidazo[1,2-<i>a</i>]pyridine and α-Diazo Esters
作者:Yunyun Li、Fen Wang、Songjie Yu、Xingwei Li
DOI:10.1002/adsc.201500709
日期:2016.3.17
Iridium(III) and rhodium(III) complexes can catalyze the carbocyclization between 2‐phenylimidazo[1,2‐a]pyridine and α‐diazo esters. The reaction occurs via CH activation and dialkylation of the arene followed by intramolecular nucleophilic substitution. Iridium(III) and rhodium(III) catalysis offer complementary scopes with respect to the α‐diazo esters.
铱(III)和铑(III)配合物可以催化2-苯基咪唑并[1,2- a ]吡啶与α-重氮酯之间的碳环化。发生反应经由Ç ħ活化和的芳烃,随后分子内亲核取代二烷基化。铱(III)和铑(III)催化作用提供了有关α-重氮酯的补充范围。
CuCl2-catalyzed N O bond cleavage of oxime esters: Approach to imidazoheterocycles and furo[3,2-c]chromenyl fused imidazoles
作者:Santosh K. Gudimella、Amanpreet Kaur、Ram Kumar、Sampak Samanta
DOI:10.1016/j.tetlet.2020.152147
日期:2020.7
An articulate approach to a diverse set of imidazoheterocycles in good to high yields via a copper-catalyzed aza-annulation of several oxime esters with a group of 2-amino-azaarenes was developed. The above cyclization reaction probably proceeds via a single electron transfer process which embodies a new technique for creating two new CN bonds for imidazole ring synthesis. Gratifyingly, the implementation
通过用几种肟酯与一组2-氨基氮杂氮杂铜进行铜催化的氮杂环化反应,开发了一种以良好至高收率的多种咪唑杂环杂环的铰接方法。上述环化反应可能是通过单电子转移过程进行的,这体现了一种新技术,该技术为咪唑环合成生成两个新的C N键。令人欣慰的是,该化学方法的实施可以进一步扩展为通过连续的C N键形成,合成带有呋喃[3,2- c ]亚甲基部分的新型稠合咪唑,随后是C(sp 2)-H功能化/ 5-内切-乙氧基环化(CC和C在铜(II)作为π亲电Lewis酸催化剂的情况下,原位生成带有环状烯酮的稠合咪唑。
Oxidative dual C–H thiolation of imidazopyridines with ethers or alkanes using elemental sulphur
Dual C–H thiolation reactions using elemental sulphur remain a challenge.
双C-H硫化反应使用元素硫仍然是一个挑战。
One-Pot Synthesis of 2-Phenylimidazo[1,2-α]pyridines from Acetophenone, [Bmim]Br3 and 2-Aminopyridine under Solvent-Free Conditions
作者:Zhang-Gao Le、Zong-Bo Xie、Jian-Ping Xu
DOI:10.3390/molecules171113368
日期:——
One-potsynthesis of 2-phenylimidazo[1,2-α]pyridines from acetophenone, [Bmim]Br3 and 2-aminopyridine under solvent-free conditions in the presence of Na2CO3, gave the corresponding 2-phenylimidazo[1,2-α]pyridines in excellent yields ranging from 72% to 89%.
Regioselective Palladium-Catalyzed Arylation and Heteroarylation of Imidazo[1,2-<i>a</i>]pyridines
作者:Sabine Berteina-Raboin、Jamal Koubachi、Saïd El Kazzouli、Abderrahim Mouaddib、Gérald Guillaumet
DOI:10.1055/s-2006-951562
日期:——
Palladium-catalyzed directarylation and heteroarylation of imidazo[1,2-a]pyridines at the 3-position are described. The optimization of the reaction in conventional heating and the adaptation under microwaves irradiation is reported. The compatibility of the synthesis with the presence of bromo or chloro substituents in the 6-position was investigated.