Enantioselective Cyclization of 4-Alkenoic Acids via an Oxidative Allylic C–H Esterification
作者:Kazuhiro Takenaka、Mitsutoshi Akita、Yugo Tanigaki、Shinobu Takizawa、Hiroaki Sasai
DOI:10.1021/ol201314m
日期:2011.7.1
An enantioselective intramolecular oxidative cyclization of 4-alkenoic acids was developed. The reaction proceeded via a π-allyl Pd intermediate generated by an allylic C–H activation to give γ-lactone derivatives with moderate to good enantioselectivity. Spiro bis(isoxazoline) ligand, SPRIX, was indispensable for this asymmetric transformation.
开发了4-烯酸的对映选择性分子内氧化环化反应。反应通过烯丙基C–H活化生成的π-烯丙基Pd中间体进行,得到具有中等至良好对映选择性的γ-内酯衍生物。螺双(异恶唑啉)配体SPRIX对于这种不对称转化是必不可少的。