Multicomponent diversity-oriented synthesis of symmetrical and unsymmetrical 1,4-dihydropyridines in recyclable glycine nitrate (GlyNO<sub>3</sub>) ionic liquid: a mechanistic insight using Q-TOF, ESI-MS/MS
作者:Rajesh Kumar、Nitin H. Andhare、Amit Shard、Richa Richa、Arun Kumar Sinha
DOI:10.1039/c4ra02169j
日期:——
unsymmetrical 1,4 DHPs under identical reaction conditions are added benefits to its practical utility. Furthermore, progress of the reaction was monitored by Q-TOF, direct infusion electrospray ionization mass spectrometry (ESI-MS), and key cationic intermediates involved in the reaction have been further identified by a tandem MS experiment (Q-TOF, ESI-MS/MS), which served as the proof of concept
多组分反应是产生具有化学多样性的,具有高原子经济性的一组多功能杂环基序的引人注目的策略,从而使转换绿色。如果考虑催化剂的可回收性,相容性和精确机理的探索,这些策略将变得更加丰富。为此,一种廉价且可循环利用的硝酸甘氨酸硝酸盐(GlyNO 3)离子液体已被有效地用于通过以下途径获得高达93%的收率的各种取代的对称和不对称的1,4-二氢吡啶三个组成部分和四个组成部分。在相同的反应条件下获得对称和不对称1,4 DHP的催化剂可回收性和相容性为其实用性带来了更多好处。此外,通过Q-TOF,直接注入电喷雾电离质谱(ESI-MS)监测反应进程,并通过串联MS实验(Q-TOF,ESI-MS)进一步确定了反应中涉及的关键阳离子中间体/ MS),作为机械模型概念的证明。这是第一份揭示汉茨反应主要遵循四个竞争反应途径中的二酮途径的报告。