Microwave-Assisted Transition-Metal-Catalyzed Synthesis of N-Shifted and Ring-Expanded Buflavine Analogues
作者:Prasad Appukkuttan、Wim Dehaen、Erik Van der Eycken
DOI:10.1002/chem.200700177
日期:2007.7.27
a difficult task due to the high activation energy needed for the ring-closure with the additional rigidity imposed by the biaryl skeleton, was achieved by using Suzuki-Miyaura biaryl coupling and a ring-closing metathesis reaction as the key steps. The combination of a second-generation Grubbs catalyst and microwave irradiation proved to be highly useful in generating the otherwise difficult to obtain
提出了两种新颖有效的策略,用于合成迄今未知的N移位和环扩展的黄素类似物。通过使用Suzuki-Miyaura联芳基偶合和一个环,可以实现标题分子的中等大小的环系统的构建,这是一项艰巨的任务,因为该闭环所需的活化能很高,且联芳基骨架具有额外的刚性。封闭复分解反应是关键步骤。事实证明,第二代Grubbs催化剂与微波辐射的结合对于生成原本难以获得的牛黄素类似物的中型环系统非常有用。