Synthesis of new chiral macrocycles-based glycolipids and its application in asymmetric Michael addition
作者:Karem J. Sabah、N. Idayu Zahid、Rauzah Hashim
DOI:10.1007/s11164-021-04432-8
日期:2021.7
A series of new mix aza- and thia-macrocyclic glycolipids (9, 10, 16 and 17) have been synthesized and their enantiomeric selectivity was studied. The synthesis of the macrocycles involved a simple protection of two hydroxyl groups of the glycolipids followed by building up the mix-heteroatom macrocyclic in simple sequences. The macrocycles and previously investigated analogues (18, 19, 20 and 21)
一系列新的混合氮杂和硫杂大环糖脂(的9,10,16和17)已被合成和它们的对映体选择性进行了研究。大环的合成涉及糖脂的两个羟基的简单保护,然后以简单的顺序建立混合-杂原子大环。大环和先前研究的类似物(18,19,20和21)已被应用于如在对映选择性迈克尔加成2-硝基丙烷,以查耳酮的相转移催化剂并表现出良好至优秀的对映体过量(ee)。在催化剂中,基于半乳糖氮杂-冠醚的糖脂事实证明21%的ee是最有效的。 图形摘要