基于荧光的技术在各种生物医学应用中起着关键作用。在这里,我们通过氧化Pictet-Spengler环化策略报告了一条有效的途径,用于开发新型荧光团indolizino [3,2- c ]喹啉。几个2-甲基吡啶与2-溴-2'-硝基苯乙酮的缩合可以使吲哚嗪迅速组装在C2位置带有2-硝基苯基。随后在温和条件下还原硝基,然后在催化量的FeCl 3存在下用各种芳基醛氧化Pictet-Spengler环化反应,从而形成了吲哚并[3,2- c]喹啉具有良好的总收率。我们还检查了这个新的多杂环化合物系列的光物理性质。发现几种吲哚并[3,2- c ]喹啉具有独特且理想的光学性质,表明这些化合物可能适合用作水性体系中的预期荧光探针。
Chiral Phosphoric Acid-Catalyzed Asymmetric Arylation of Indolizines: Atroposelective Access to Axially Chiral 3-Arylindolizines
作者:Xiaoxiao Song、Yanjun Fan、Zhiming Zhu、Qijian Ni
DOI:10.1021/acs.orglett.2c00461
日期:2022.4.1
straightforward strategy for the synthesis of a new axially chiral 3-arylindolizine scaffold via organocatalyticasymmetric arylation reactions of indolizines and p-quinone esters. Using the chiral phosphoric acid catalyst, a series of axially chiral 3-arylindolizines were accessed in good to excellent yields and atropo-enantioselectivities. This approach features a broad substrate scope, mild reaction conditions