Significant Acceleration of 6π-Azaelectrocyclization Resulting from a Remarkable Substituent Effect and Formal Synthesis of the Ocular Age Pigment A2-E by a New Method for Substituted Pyridine Synthesis
作者:Katsunori Tanaka、Hajime Mori、Mako Yamamoto、Shigeo Katsumura
DOI:10.1021/jo005779+
日期:2001.5.1
by molecular orbital calculations. The formal synthesis of the unusual retinal metabolite, A2-E, was achieved by two types of the new one-pot synthesis of substituted pyridines by utilizing the obtained facile 6 pi-azaelectrocyclization, one of which is compatible with the proposed metabolic pathway of A2-E.
发现由于1-氮杂芳烃中的C4-羰基和C6-烯基或苯基取代基的结合,使6 pi-氮杂电子环化显着加速。通过考虑1-氮杂芳烃的HOMO和LUMO之间显着的轨道相互作用来合理化这一观察,这是通过分子轨道计算获得的。通过利用获得的简便的6 pi-氮杂电环化,通过两种新的一锅合成吡啶的新型方法,完成了异常视网膜代谢产物A2-E的正式合成,其中一种与拟议的A2代谢途径兼容-E。