Substrate Control in the Asymmetric Aminohydroxylation of Monosubstituted Alkenes: The Enantioselective Synthesis of GABOB and Homoserine Derivatives
作者:Malcolm D. McLeod、Michael Harding、Jennifer A. Bodkin、Craig A. Hutton
DOI:10.1055/s-2005-918939
日期:——
group in the asymmetric aminohydroxylation reaction of but-3-en-1-ol derivatives. Either regioisomeric product can he obtained with useful levels of eoantioselectivity, allowing for the short enantioselective synthesis of GABOB and homoserine derivatives.
Selective Aerobic Oxidation of Methylarenes to Benzaldehydes Catalyzed by <i>N</i>
-Hydroxyphthalimide and Cobalt(II) Acetate in Hexafluoropropan-2-ol
作者:Eden Gaster、Sebastian Kozuch、Doron Pappo
DOI:10.1002/anie.201702511
日期:2017.5.15
Efficient and highly selective catalytic conditions for the aerobic autoxidation of methylarenes to benzaldehydes, based on N‐hydroxyphthalimide (NHPI) and cobalt(II) acetate in 1,1,1,3,3,3‐hexafluoropropan‐2‐ol (HFIP), were developed. The sustainable conditions enable a multigram scale preparation of benzaldehyde derivatives in high efficiency and with excellent chemoselectivity (up to 99 % conversion
作者:Chetan C. Chintawar、Amit K. Yadav、Nitin T. Patil
DOI:10.1002/anie.202002141
日期:2020.7.13
Herein, we disclose the gold‐catalyzed 1,2‐diarylation of alkenes through the interplay of ligand‐enabled AuI/AuIII catalysis with the idiosyncratic π‐activation mode of gold complexes. Unlike the classical migratory‐insertion‐based approach to 1,2‐diarylation, the present approach not only circumvents the formation of direct Ar−Ar′ coupling and Heck‐type side products but more intriguingly demonstrates
本文中,我们通过配体使能的Au I / Au III催化与金配合物的特质π活化模式的相互作用揭示了金的烯烃1,2-二芳基化反应。与经典的基于迁移插入的方法进行1,2-二芳基化不同,本方法不仅规避了直接Ar-Ar'偶联和Heck型副产物的形成,而且更有趣地证明了其反应性和选择性与先前已知的互补金属催化(Pd,Ni或Cu)。对机理进行详细研究的结果表明,由于芳基烯烃具有非清白的性质,芳基碘化物向Au I络合物的氧化加成是限速步骤。
Ir-Catalyzed Intermolecular Branch-Selective Allylic C–H Amidation of Unactivated Terminal Olefins
作者:Honghui Lei、Tomislav Rovis
DOI:10.1021/jacs.9b00237
日期:2019.2.13
An efficient method for intermolecular branch-selective allylicC-H amidation has been accomplished via Ir(III) catalysis. The reaction proceeds through initial allylicC-H activation, supported by the isolation and crystallographic characterization of an allyl-Ir(III) intermediate, followed by a subsequent oxidative amidation with readily available dioxazolones as nitrenoid precursors. A diverse range
set of base metal catalysts has been developed for regiodivergent alkene hydrosilylations: iron complexes of phosphine‐iminopyridine are selective for anti‐Markovnikov hydrosilylations (linear/branched up to >99:1), while the cobalt complexes bearing the same type of ligands provide an unprecedented high level of Markovnikov selectivity (branched/linear up to >99:1). Both systems exhibit high efficiency