ketones. The new bases exhibit a wide range of selectivities, from poor to excellent (up to 95:5 e.r.); trends between amine structure and the subsequent selectivity of the deprotonation system are detailed. In addition, the effects on the selectivity and the reactivity of the deprotonation process on replacing the Lewis base additive HMPA for DMPU have been investigated and found to be related to the reaction
已经制备了一系列新颖的,光学上纯净的Mg-双酰胺,并依次用于介导构象锁定的酮的对映选择性去质子化。新的碱具有广泛的选择性,从差到极好(高达95:5 er)。详细介绍了胺结构与去质子系统后续选择性之间的趋势。另外,已经研究了去质子化工艺对用于
DMPU的路易斯基添加剂HMPA的替代对去质子化反应的选择性和反应性的影响,并且发现其与反应温度有关。