An efficient diastereoselective synthesis of spiro pyrido[2,1-b][1,3]oxazines via a novel pyridine-based three-component reaction
作者:Abbas Ali Esmaeili、Hamid Vesalipoor、Rahele Hosseinabadi、Alireza Fakhari Zavareh、Mohammad Ali Naseri、Ebrahim Ghiamati
DOI:10.1016/j.tetlet.2011.07.039
日期:2011.9
The zwitterions generated from pyridine and dialkyl acetylenedicarboxylate (DAAD) reacted with benzofuran-2,3-diones to form highly substituted spiro pyrido[2,1-b][1,3]oxazines in good to high yields without using a catalyst.
由吡啶和乙酰二羧酸二烷基酯(DAAD)生成的两性离子与苯并呋喃-2,3-二酮反应形成高取代的螺吡啶并[2,1- b ] [1,3]恶嗪,而无需使用催化剂。