Comparison of the Suzuki cross-coupling reactions of 4,7-dichloroquinoline and 7-chloro-4-iodoquinoline with arylboronic acids using phosphine-free palladium catalysis in water
作者:Richard W Friesen、Laird A Trimble
DOI:10.1139/v03-187
日期:2004.2.1
1b undergoes a more regioselective Suzuki reaction than 1a, additional important observations are that the overall reaction of 1b with 2 is three times slower than 1a and that the reaction occurs in the absence of tetrabutylammonium bromide. Using optimized reaction conditions, a variety of aryl and vinylboronic acids undergo regioselective Suzuki cross-coupling with 1b to provide the products 7, 10
4,7-二氯喹啉 (1a) 和 7-氯-4-碘喹啉 (1b) 在沸水中由无膦乙酸钯催化,与芳基硼酸发生 Suzuki 交叉偶联反应。使用苯基硼酸 (2),1a 的反应提供 7-氯-4-苯基喹啉 (3) (78%) 和二苯基喹啉 (4) (12%),而 1b 以更具区域选择性的方式反应并提供 3 in 98% 的分离产率。尽管 1b 经历了比 1a 更具区域选择性的 Suzuki 反应,但其他重要的观察结果是 1b 与 2 的整体反应比 1a 慢三倍,并且该反应在不存在四丁基溴化铵的情况下发生。使用优化的反应条件,各种芳基和乙烯基硼酸与 1b 进行区域选择性 Suzuki 交叉偶联,提供产物 7、10、