Cyclization of Oxa-Bicyclic Alkenes with β-Iodo-(Z)-propenoates and <i>o-</i>Iodobenzoate Catalyzed by Nickel Complexes: A Simple Efficient Route to Annulated Coumarins
作者:Dinesh Kumar Rayabarapu、Paritosh Shukla、Chien-Hong Cheng
DOI:10.1021/ol036027f
日期:2003.12.1
Ni(dppe)Br(2) and Zn powder in acetonitrile at 80 degrees C, oxa-bicyclic olefins undergo cyclization with o-iodobenzoate and with beta-iodo-(Z)-propenoates to give the benzocoumarin derivatives in moderate to good yields. This methodology offers a simple efficient way for the synthesis of structurally complicate coumarins in one pot. [reaction: see text]
在80°C乙腈中存在Ni(dppe)Br(2)和Zn粉的情况下,氧-双环烯烃与邻碘苯甲酸酯和β-碘-(Z)-丙酸酯进行环化反应,制得中等程度的苯并香豆素衍生物高产。这种方法为在一个锅中合成结构复杂的香豆素提供了一种简单有效的方法。[反应:看文字]