Chiral Palladacycle Catalysts Generated on a Single-Handed Helical Polymer Skeleton for Asymmetric Arylative Ring Opening of 1,4-Epoxy-1,4-dihydronaphthalene
作者:Takeshi Yamamoto、Yuto Akai、Michinori Suginome
DOI:10.1002/anie.201407358
日期:2014.11.17
Post‐polymerization CH activation of poly(quinoxaline‐2,3‐diyl)‐based helically chiral phosphine ligands (PQXphos) with palladium(II) acetate afforded chiral phosphapalladacycles quantitatively. In situ generated palladacycles exhibited enantioselectivities up to 94 % ee in the palladium‐catalyzed asymmetric ring‐opening arylation of 1,4‐epoxy‐1,4‐dihydronaphthalenes with arylboronic acids.
聚合后Ç ħ聚活化(喹喔啉-2,3-二基)基螺旋手性膦配体(PQXphos)与钯(II)醋酸盐,得到手性phosphapalladacycles定量。在钯催化的1,4-环氧-1,4-二氢萘与芳基硼酸的钯催化不对称开环芳基化反应中,原位生成的palladacycles表现出高达94%ee的对映选择性 。