Isocyanide Insertion–Cyclization Reaction for Imidazoisoindol-5-imine Scaffold Synthesis: A Selective Solvatochromic Fluorescent Probe for Methanol Detection
An efficient, ligand-free, and Pd-catalyzed method for the synthesis of imidazoisoindole imine scaffolds with satisfactory yields via C–C and C–N bond formation has been developed. The synthesized scaffolds have unique potential for selective MeOH detection from other solvents, especially EtOH. The appealing features of this transformation are phosphinic ligand-free conditions, the use of a small amount
CuI-catalyzed synthesis of (benzo)imidazo[2,1-a]isoquinolinone derivatives via successive α-arylation, deacylation and benzyl automatic oxidation
作者:Wei-Qing Miao、Jian-Quan Liu、Xiang-Shan Wang
DOI:10.1016/j.tet.2020.131200
日期:2020.5
be automatically oxidized by oxygen in the reaction of 2-(2-bromophenyl)-1H-imidazole and 1,3-dicarbonyl compounds catalyzed CuI. This domino procedure involved the subsequent α-arylation, deacylation, nucleophilic addition and benzyl automatic oxidation, and provided an efficient method for the synthesis of (benzo)imidazo[2,1-a]isoquinolinone derivatives in good yields.
在2-(2-溴苯基)-1H-咪唑与1,3-二羰基化合物催化的CuI的反应中,发现苄基位置被氧自动氧化。该多米诺步骤涉及随后的α-芳基化,脱酰基,亲核加成和苄基自动氧化,并提供了以高收率合成(苯并)咪唑并[2,1- a ]异喹啉酮衍生物的有效方法。
Copper/l-proline-catalyzed synthesis of 5-amino-2,3-diphenylimidazo[2,1-a]isoquinolines in the presence of Cs2CO3
作者:Mei-Mei Zhang、Wei-Qing Miao、Xiang-Shan Wang
DOI:10.1007/s00706-018-2344-2
日期:2019.4
AbstractMalononitrile underwent α-arylation with 2-(2-bromophenyl)-4,5-diphenyl-1H-imidazole to give a subsequent nucleophilic addition and dehydration products of 5-amino-2,3-diphenylimidazo[2,1-a]isoquinoline-6-carbonitriles catalyzed by CuI/l-proline. Under the same reaction conditions, this novel procedure had a good chemoselectivity in cyanacetates for the efficientsynthesis of 5-aminoimidazo[2,1-a]isoquinoline-6-carboxylate
摘要丙二腈后行α芳基化与2-(2-溴苯基)-4,5-二苯基-1- ħ咪唑,得到5-氨基-2,3-二diphenylimidazo的后续亲核加成和脱水产物[2,1-一个] CuI- 1-脯氨酸催化的异喹啉-6-腈。在相同的反应条件下,该新方法在氰基乙酸盐中具有良好的化学选择性,可以以高收率高效合成5-氨基咪唑并[2,1- a ]异喹啉-6-羧酸酯衍生物。 图形概要
CuI-catalyzed Sonogashira reaction for the efficient synthesis of 1 H -imidazo[2,1- a ]isoquinoline derivatives
作者:Ma-Yong Gang、Jian-Quan Liu、Xiang-Shan Wang
DOI:10.1016/j.tet.2017.06.043
日期:2017.8
reaction first, and then intra-molecular hydroamination of alkyne catalyzed by CuI/o-phen was proved to be an efficient method for the synthesis of imidazo[2,1-a]isoquinoline, phenanthro[9′,10′:4,5]imidazo[2,1-a]isoquinoline and acenaphtho[1′,2′:4,5]imidazo [2,1-a]isoquinoline derivatives in the presence of Cs2CO3.
实验证明,先进行Sonogashira反应,然后再用CuI / o -phen催化炔烃分子内加氢胺化反应是合成咪唑并[2,1- a ]异喹啉,菲咯啉[9',10':4]的有效方法。在Cs 2 CO 3存在下,, 5]咪唑并[2,1- a ]异喹啉和[1',2':4,5]咪唑并[2,1- a ]异喹啉衍生物。
Efficient Multi-component Synthesis of Highly Substituted Imidazoles Utilizing P2O5/SiO2 as a Reusable Catalyst
gel (P2O5/SiO2) has been used as an efficient and reusable catalyst for the one‐pot pseudo four‐componentsynthesis of 2,4,5‐trisubstituted imidazoles from benzil or benzoin, aldehydes, and ammonium acetate. It was also used for four‐component preparation of 1,2,4,5‐tetrasubstitutedimidazoles from benzil or benzoin, aldehydes, primary amine, and ammonium acetate under thermal solvent‐free conditions
负载在硅胶(P 2 O 5 / SiO 2)上的五氧化二磷已被用作一种高效且可重复使用的催化剂,用于由苯甲腈或安息香,醛,和醋酸铵。它也可在无热溶剂的条件下用于由苄基或安息香,醛,伯胺和乙酸铵四组分制备1,2,4,5-四取代的咪唑。这种新方法的显着特征是高转化率,更清洁的反应,简单的实验和后处理程序,并且催化剂可以轻松地从反应混合物中分离出来并重复使用几次,而不会损失其活性。