Efficient Synthesis of Pyrido[3,2-c]coumarins via Silver Nitrate Catalyzed Cycloisomerization and Application to the First Synthesis of Polyneomarline C
作者:Jeong A Yoon、Young Taek Han
DOI:10.1055/s-0037-1610730
日期:2019.12
Herein, we report an efficient method for the synthesis of the pyrido[3,2-c]coumarin scaffold, one of the privileged heterocycle-fused coumarin scaffolds, via a AgNO3-catalyzed cycloisomerization of 4-(propynylamino)coumarins obtained from diverse 4-hydroxycoumarins. This concise method affords pyrido[3,2-c]coumarin analogues bearing diverse substituents on the benzene or pyridine ring in moderate
在本文中,我们报告了一种通过AgNO 3催化的4-(丙炔基氨基)香豆素的环异构化合成吡啶并[3,2- c ]香豆素骨架的一种有效方法,该吡啶并[3,2- c ]香豆素骨架是一种特权杂环融合的香豆素骨架。4-羟基香豆素。这种简洁的方法以中等到良好的产率提供了在苯或吡啶环上带有各种取代基的吡啶并[3,2- c ]香豆素类似物。此外,该方法还扩展到了三步分离法的简便合成,该方法是从中草药Polyalthia nemoralis A. DC。分离出的天然吡啶并[3,2- c ]香豆素衍生物。已知的4-羟基香豆素。