Asymmetric synthesis catalyzed by chiral ferrocenylphosphine-transition metal complexes. 3. Preparation of optically active allylsilanes by palladium-catalyzed asymmetric Grignard cross-coupling
Optically active allylsilanes. 1. Preparation by palladium-catalyzed asymmetric Grignard cross-coupling and anti stereochemistry in electrophilic substitution reactions
Synthesis of Enantioenriched Allylic Silanes via Nickel-Catalyzed Reductive Cross-Coupling
作者:Julie L. Hofstra、Alan H. Cherney、Ciara M. Ordner、Sarah E. Reisman
DOI:10.1021/jacs.7b11707
日期:2018.1.10
asymmetric Ni-catalyzed reductive cross-coupling has been developed to prepare enantioenriched allylic silanes. This enantioselective reductive alkenylation proceeds under mild conditions and exhibits good functional group tolerance. The chiral allylic silanes prepared here undergo a variety of stereospecific transformations, including intramolecular Hosomi-Sakurai reactions, to set vicinal stereogenic centers
已开发出不对称 Ni 催化的还原交叉偶联来制备对映体富集的烯丙基硅烷。这种对映选择性还原烯基化在温和条件下进行,并表现出良好的官能团耐受性。这里制备的手性烯丙基硅烷经过各种立体定向转化,包括分子内细美-樱井反应,以设置具有优异手性转移的邻位立体中心。
Chirality transfer from optically active allylsilanes to π-allylpalladium complexes
作者:Tamio Hayashi、Mitsuo Konishi、Makoto Kumada
DOI:10.1039/c39830000736
日期:——
The reaction of lithium palladates with the opticallyactive allylsilanes, (E)- and(Z)-1-phenyl-1-trimethylsilyl-but-2-ene and (E)-and (z)-1-phenyl-3-trimethylsilylbut-1-ene proceeds stereospecifically [anti attack of palladium(II) with respect to the leaving silyl group] to give opticallyactiveπ-allylpalladiumcomplexes containing the η3-(1-methyl-3-phenylallyl) group in high yields.