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。