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]