Iridium-Catalyzed Asymmetric Ring-Opening of Oxabicyclic Alkenes with Carboxylic Acids
作者:Yuhua Long、Xiaolu Li、Xuejing Pan、Dandan Ding、Xuan Xu、Xiongjun Zuo、Dingqiao Yang、Sanyong Wang、Chunrong Li
DOI:10.1007/s10562-013-1136-x
日期:2014.3
in 1 followed by SN2′ nucleophilic attack by carboxylic acids. The effects of various bisphosphine ligands, Ag(I) salts, ammonium halides, bases, and solvents on the yields and enantioselectivities of the reaction were also investigated. The theoretical analysis of stability and hydrogen bond for 1-hydroxy-1,2-dihydronaphthalen-2-yl 4-chlorobenzoate 2a were performed using the density functional theory
报道了一种新颖的铱催化的氧杂二环烯烃与各种羧酸的不对称开环,得到相应的反式羧酸 1-羟基-1,2-二氢-萘-2-基酯产物,产率良好在温和条件下具有中等的对映选择性。反式产物是通过对 1 中桥头碳-氧键的对映选择性裂解,然后是 SN2' 羧酸的亲核攻击形成的。还研究了各种双膦配体、Ag(I) 盐、卤化铵、碱和溶剂对反应产率和对映选择性的影响。使用密度泛函理论B3LYP方法对1-羟基-1,2-二氢萘-2-基4-氯苯甲酸酯2a的稳定性和氢键进行了理论分析。通过X射线衍射分析证实了产物2a的反式构型。提出了目前催化反应的可能机制。 图文摘要报道了一种新型的铱催化的氧杂双环烯烃与多种羧酸的不对称开环,得到相应的反式羧酸 1-羟基-1,2-二氢-naphthalen-2-yl 酯产物在温和条件下具有中等对映选择性,收率良好。反式产物是通过对 1 中桥头碳-氧键的对映选择性裂解,然后是 SN2' 羧酸的