An optimized protecting group for allylboronates allowed the use of ketones in order to synthesize all isomers of quaternary homoallylic alcohols with high enantioselectivities. All symmetric isomers of the allylboronate were prepared in high yields and diastereoselectivities using Sn2′ reactions. The improved reactivity of the novel protecting group was verified by following the reaction kinetics
优化的烯丙基硼酸酯保护基允许使用酮,以合成具有高对映选择性的季均烯丙基醇的所有异构体。使用S n 2'反应可高收率和非对映选择性地制备烯丙基硼酸酯的所有对称异构体。通过使用1 H NMR光谱跟踪反应动力学,证实了新型保护基的反应性得到了提高。进行了使用DFT计算的机械研究,以调查新发现。因此,可以合理化立体化学结果和增强的反应性。
Direct asymmetric three-componentMannichreaction involving simple ketones (such as cyclohexanone, acetone, and acetophenone) as donors and catalyzing by silver tartaric acid-derived phosphate was realized to afford a series of optically active β-amino-ketone derivatives in high yields (up to 96%) and good-to-high enantioselectivities (up to 97%) with moderate-to-good diastereoselectivities. This