An expeditious microwave assisted one-pot sequential route to pyrido fused imidazo[4,5-<i>c</i>] quinolines in green media
作者:Ramdas Nishanth Rao、Kaushik Chanda
DOI:10.1039/d0nj05835a
日期:——
formation of new C–C and C–N bonds in a one-pot sequential manner. The cyclization proceeds through the CO(carbonyl)–C(H) cleavage of the aldehyde group via oxidative cross-coupling, transamination, cyclization and aromatization steps. Low cost reagents and a green solvent were used to facilitate the architecturally beautiful pyrido fused imidazo[4,5-c]quinoline scaffolds in high yields. The key features
已经开发了一种快速的微波辅助单锅顺序路线,通过Pictet-Spengler环化策略合成吡啶基稠合的咪唑并[4,5- c ]喹啉。在这项研究中,取代的2-氨基吡啶与2-溴-2'-硝基苯乙酮缩合生成在C-2位置具有硝基官能团的咪唑并[1,2- a ]吡啶。在绿色介质中将硝基还原成胺同类物,然后用Pictet-Spengler取代醛进行环化策略,导致以一锅顺序方式形成新的C-C和C-N键。通过CO的环化所得(羰基)-C(H)的醛基的裂解通过氧化交叉偶联,氨基转移,环化和芳构化步骤。低成本的试剂和绿色溶剂被用于以高收率促进结构上漂亮的吡啶基稠合的咪唑并[4,5- c ]喹啉支架。该合成方案的关键特征是使用微波辅助的温和反应条件,一锅法连续途径,广泛的底物范围和绿色介质,这使其对于合成稠合多杂环化合物是可行的。此外,杂芳族和脂族醛的合成操作也进行得很好。
6π-Electrocyclization in water: microwave-assisted synthesis of polyheterocyclic-fused quinoline-2-thiones
Microwave-assisted synthesis of polyheterocyclic-fused quinoline-2-thiones through the annulation of ortho-heteroaryl anilines and CS2 was realized in water without using any catalysts and additives.