The Application of HETPHOX Ligands to the Asymmetric Intermolecular Heck Reaction
作者:Patrick J. Guiry、Tim G. Kilroy、Pier Giorgio Cozzi、Nicole End
DOI:10.1055/s-2003-43345
日期:——
Two new heterocyclic diphenylphosphinooxazolines derived from thiophene and benzothiophene were prepared in moderate to good yield and these, and a range of related HETPHOX ligands, were applied in the intermolecular asymmetric Heck reaction. Phenylation of 2,3-dihydrofuran with the t-butyl-substituted thiophene-oxazoline ligand gave (R)-2-phenyl-2,3-dihydrofuran highly regioselectively with excellent
以中等至良好的收率制备了两种衍生自噻吩和苯并噻吩的新型杂环二苯基膦恶唑啉,并将这些以及一系列相关的 HETPHOX 配体应用于分子间不对称 Heck 反应。2,3-二氢呋喃与叔丁基取代的噻吩-恶唑啉配体的苯基化得到高度区域选择性的 (R)-2-苯基-2,3-二氢呋喃,具有出色的对映选择性 (91-95% ee) 和良好的产率 (70 -97%)。此外,2,3-二氢呋喃的环己烯基化以高达 97% ee 的对映选择性进行,产率极好 (97%),再次证明叔丁基取代的噻吩-恶唑啉配体在所研究的一系列反应条件下是最佳的。