First examples of palladium-catalyzed cross-coupling reactions, such as Suzuki, Sonogashira, Heck and Buchwald-Hartwig reactions, are reported in the pyrido[2,3-b]pyrazine series. This methodology circumvents problems found in uncatalyzed nucleophilic substitution used so far to introduce substituents into the pyrido[2,3-b]pyrazine ring.
                                    首次报道了
钯催化的交叉耦合反应示例,如铃木反应、园田反应、赫克反应和布赫瓦尔德-哈特维希反应,应用于
吡啶并[2,3-b]
吡唑系列。这种方法克服了迄今为止用于在
吡啶并[2,3-b]
吡唑环中引入取代基的无催化亲核取代反应所遇到的问题。