2,2′-Isopropylidenebis[(4S,5R)-4,5-di(2-naphthyl)-2-oxazoline] ligand for asymmetric cyclization–carbonylation of meso-2-alkyl-2-propargylcyclohexane-1,3-diols
作者:Keisuke Kato、Chie Matsuba、Taichi Kusakabe、Hiroyuki Takayama、Shigeo Yamamura、Tomoyuki Mochida、Hiroyuki Akita、Tat'yana A. Peganova、Nikolai V. Vologdin、Oleg V. Gusev
DOI:10.1016/j.tet.2006.08.004
日期:2006.10
of meso-2-alkyl-2-propargylcyclohexane-1,3-diols mediated by Pd(II) with chiral bisoxazoline (box ligand) afforded bicyclic-β-alkoxyacrylates. Based on a ligand screening, 2,2′-isopropylidenebis[(4S,5R)-4,5-di(2-naphthyl)-2-oxazoline] ligand has been developed. The products with a chiral quaternary carbon were obtained in 71–100% yields with 85–95% ee.
Pd(II)与手性双恶唑啉(盒配体)介导的内消旋-2-烷基-2-炔丙基环己烷-1,3-二醇的氧化环化-羰基化反应生成双环-β-烷氧基丙烯酸酯。基于配体筛选,已经开发了2,2'-异亚丙基双[(4 S,5 R)-4,5-二(2-萘基)-2-恶唑啉]配体。以71-100%的收率和85-95%的ee获得具有手性季碳的产物。