Simple Synthetic Approach to N-(Pyridin-2-yl)imidates from Nitrostyrenes and 2-Aminopyridines via the N-(Pyridin-2-yl)iminonitriles as Intermediates
作者:Andriani G. Chaidali、Ioannis N. Lykakis
DOI:10.3390/molecules28083321
日期:——
A facile, green, synthetic protocol of several substituted N-(pyridin-2-yl)imidates from nitrostyrenes and 2-aminopyridines via the corresponding N-(pyridin-2-yl)iminonitriles as intermediates is reported. The reaction process involved the in situ formation of the corresponding α-iminontriles under heterogeneous Lewis acid catalysis in the presence of Al2O3. Subsequently, α-iminonitriles were selectively
报道了通过相应的 N-(pyridin-2-yl) 亚氨基腈作为中间体,从硝基苯乙烯和 2-氨基吡啶中合成几种取代的 N-(pyridin-2-yl) 亚胺酸酯的简便、绿色的合成方案。反应过程涉及在 Al2O3 存在下,在非均相路易斯酸催化下原位形成相应的 α-亚胺腈。随后,在环境条件下和在酒精介质中存在 Cs2CO3 的情况下,α-亚氨基腈被选择性地转化为所需的 N-(吡啶-2-基) 亚胺酸酯。在这些条件下,1,2- 和 1,3- 丙二醇也在室温下生成相应的单取代亚胺酸酯。目前的合成协议也是在一个 mmol 规模上开发的,提供了对这一重要支架的访问。