报道了两种手性大体积醇盐前配体 1-金刚烷基叔丁基苯基甲醇 HOCAd t BuPh 和 1-金刚烷基甲基苯基甲醇 HOCAdMePh 的合成,描述了它们与镁 ( II ) 的配位化学,并与之前报道的配位化学进行了比较非手性大体积醇盐前配体 HOC t Bu 2 Ph。用两当量的 HOCAd t BuPh 外消旋混合物处理正丁基仲丁基镁,选择性地形成单核双(醇盐)配合物 Mg(OCAd t BuPh) ) 2 (四氢呋喃) 2 . 1 H NMR光谱和X射线晶体学表明选择性形成C 2 -对称纯手性非对映体Mg(OC R Ad t BuPh) 2 (THF) 2 /Mg(OC S Ad t BuPh) 2 (THF) 2 。相比之下,空间阻碍较小的 HOCAdMePh 导致双核产物的形成,表明仅部分烷基取代。 测试了单核 Mg(OCAd t BuPh) 2 (THF) 2络合物作为聚酯合成不
A protocol for the synthesis of α-tertiary amines was developed by iterative addition of carbon nucleophiles to N,N-dialkyl carboxamides. Nucleophilic 1,2-addition of organolithium reagents to carboxamides forms anionic tetrahedral carbinolamine (hemiaminal) intermediates, which are subsequently treated with bromotrimethylsilane (Me3SiBr) followed by organomagnesium (Grignard) reagents, organolithium