ETH Zürich, HCI H335, 8093 Zürich, Switzerland.
Angew Chem Int Ed Engl. 2012 Aug 20;51(34):8652-5. doi: 10.1002/anie.201202092. Epub 2012 Jul 25.
You'll take the high road and I'll take the low road: Enantioenriched allylic thioethers have been synthesized from chiral racemic allylic alcohols. The combination of an Ir-(P,alkene) complex and dibutyl phosphoric acid are required to attain high selectivities. Mechanistic studies uncover an enantioconvergent transformation in which substrate enantiomers react along different pathways to give the same product (see scheme; cod=1,5-cyclooctadiene).
你走你的阳关道,我走我的独木桥:手性外消旋烯丙醇可合成非对映富集的烯丙基硫醚。Ir-(P,alkene)配合物和磷酸二丁酯的组合是实现高选择性所必需的。机理研究揭示了一种对映体转化,其中底物对映异构体沿着不同的途径反应生成相同的产物(见方案;cod=1,5-环辛二烯)。