Diastereoselective Metal-Catalyzed Synthesis of<i>C</i>-Aryl and<i>C</i>-Vinyl Glycosides
作者:Lionel Nicolas、Patrick Angibaud、Ian Stansfield、Pascal Bonnet、Lieven Meerpoel、Sébastien Reymond、Janine Cossy
DOI:10.1002/anie.201204786
日期:2012.10.29
Cobalt, the catalyst of choice: The diastereoselective cobalt‐catalyzed cross‐coupling of 1‐bromo glycosides and aryl or vinyl Grignard reagents is described. A convenient and inexpensive catalyst, [Co(acac)3]/tmeda (acac=acetylacetonate, tmeda=N,N′‐tetramethylethylenediamine), gives full α selectivity in the mannose and galactose series, and an α selectivity in the glucose series with α/β ratios of
钴,选择的催化剂:描述了1-溴糖苷与芳基或乙烯基格氏试剂的非对映选择性钴催化的交叉偶联。一种方便且廉价的催化剂[Co(acac)3 ] / tmeda(acac =乙酰丙酮酸酯,tmeda = N,N'-四甲基乙二胺)在甘露糖和半乳糖系列中具有完全的α选择性,而在葡萄糖系列中具有一个α选择性, α / β比为1.3:1-3:1。