Palladium-catalyzed carbonylative annulation of terminal alkynes: synthesis of coumarins and 2-quinolones
作者:Dmitry V Kadnikov、Richard C Larock
DOI:10.1016/s0022-328x(03)00786-1
日期:2003.12
o-Iodophenols and o-iodoaniline derivatives react with terminal alkynes under 1 atm of CO in the presence of pyridine and catalytic amounts of Pd(OAc)2 to generate coumarins and 2-quinolones, respectively, as the only products. Terminal alkynes bearing alkyl, aryl, silyl, hydroxyl, ester and cyano substituents are effective in these processes affording the desired products in moderate yields. The formation
在吡啶和催化量的Pd(OAc)2存在下,邻碘苯酚和邻碘苯胺衍生物在1大气压的CO下与末端炔烃反应,分别生成香豆素和2-喹诺酮作为唯一产物。带有烷基,芳基,甲硅烷基,羟基,酯和氰基取代基的末端炔烃在这些方法中是有效的,以中等收率提供所需的产物。在此过程中香豆素和2-喹诺酮类化合物的形成与以前描述的所有钯催化的邻碘酚或邻碘酚的反应形成鲜明对比。-带有末端炔烃和CO的碘苯胺,提供了色酮和4-喹诺酮。此外,在我们的反应条件下,末端炔烃插入碳钯键中,而不是进行同位素标记实验所证实的Sonogashira型偶联。