A General Synthetic Route to Dibenzospiropyrans and Dinaphthospiropyrans from Dibenzofuran and Dinaphthofuran
作者:Baiquan Wang、Bin Wang、Minxiong Li、Shansheng Xu、Haibin Song
DOI:10.1055/s-2007-966061
日期:2007.6
The reaction of dibenzofuran or dinaphthofuran with lithium in anhydrous diethyl ether led to a solution of the corresponding C,O-dilithiated intermediate which, upon treatment with 1,3,3-trimethylindolin-2-one or different coumarin derivatives at -78 °C, afforded, after hydrolysis, dibenzospiropyrans and dinaphthospiropyrans in good yields. The structures of all new compounds were determined by single crystal X-ray analysis.
在无水二乙醚中,二苯并呋喃或二萘并呋喃与锂反应生成相应的C,O-二锂化中间体,该中间体经与1,3,3-三甲基吲哚啉-2-酮或不同香豆素衍生物在-78°C下处理后,经水解得到高产率的二苯并螺吡喃和二萘并螺吡喃。所有新化合物的结构均通过单晶X射线分析确定。