Synthesis of Dihydrobenzofurans via Palladium-Catalyzed Annulation of 1,3-Dienes by <i>o</i>-Iodoaryl Acetates
作者:Roman V. Rozhkov、Richard C. Larock
DOI:10.1021/jo100495t
日期:2010.6.18
palladium-catalyzed annulation of 1,3-dienes by o-iodoaryl acetates provides an efficient approach to biologically interesting dihydrobenzofurans. The annulation is believed to proceed via (1) oxidative addition of the aryl iodide to Pd(0), (2) syn-addition of the resulting arylpalladium complex to the 1,3-diene, (3) intramolecular coordination of the phenolic oxygen to the Pd center, (4) hydrolysis of the acetyl
乙酸邻碘芳基酯在钯催化的1,3-二烯上的环化反应提供了一种有效的方法,用于制备生物学上令人关注的二氢苯并呋喃。该环被认为是通过(1)氧化加成的芳基碘化物与Pd(0),(2)进行合成所得的芳基钯配合物与1,3-二烯的-addition,(3)分子内酚氧的协调到Pd中心,(4)乙酰基水解,和(5)Pd(0)的还原消除,从而使催化剂再生。该反应是相当普遍的,区域选择性,立体选择性和,以及各种终端,环状的,和内部1,3-二烯,以及富电子和缺电子ø -iodoaryl乙酸盐,可以使用。