Synthesis of a Bulky and Electron-Rich Derivative of SEGPhos and Its Application in Ru-Catalyzed Enantioselective Hydrogenation of β-Ketoesters
作者:Xiaobing Wan、Yanhui Sun、Yunfei Luo、Dao Li、Zhaoguo Zhang
DOI:10.1021/jo048466d
日期:2005.2.1
electron-rich derivative of SEGPhos and its application in Ru-catalyzed asymmetric hydrogenation reaction of β-ketoesters are reported. Up to 99.5% ee was achieved. Under solvent-free reaction conditions, acetoacetates could be reduced with good enantioselectivity and high efficiency; a TON of 20 000 was obtained within 3.5 h. The results obtained were comparable to those when SEGPhos was applied.
报道了SEGPhos的庞大和富电子的衍生物的合成和拆分及其在Ru催化的β-酮酸酯的不对称加氢反应中的应用。达到了99.5%ee。在无溶剂的反应条件下,乙酰乙酸盐可以良好的对映选择性和高效率被还原。在3.5小时内获得了20,000的TON。获得的结果与使用SEGPhos时的结果相当。