Catalytic Intermolecular Tail-to-Tail Hydroalkenylation of Styrenes with α Olefins: Regioselective Migratory Insertion Controlled by a Nickel/N-Heterocyclic Carbene
作者:Chun-Yu Ho、Lisi He
DOI:10.1002/anie.201001849
日期:2010.11.22
first single‐operation, highly selective intermolecular tail‐to‐tail hetero‐hydroalkenylation from two readily available monosubstituted alkenes is described (see scheme; IPr=1,3‐Bis(2,6‐di‐isopropylphenyl)imidazol‐2‐ylidene). The reaction is catalyzed by the proposed [(IPr)NiH]OTf species. The method allows the use of more common and structurally diverse αolefins as substrates, which were previously
Bench-Stable <i>N</i>
-Heterocyclic Carbene Nickel Precatalysts for C−C and C−N Bond-Forming Reactions
作者:Felix Strieth-Kalthoff、Ashley R. Longstreet、Jessica M. Weber、Timothy F. Jamison
DOI:10.1002/cctc.201800454
日期:2018.7.9
Herein, we introduce a new class of bench‐stable N‐heterocycliccarbene (NHC) nickel‐precatalysts for homogeneous nickel‐catalysis. The nickel(II) complexes are readily activated to Ni0 in situ under mild conditions, via a proposed Heck‐type mechanism. The precatalysts are shown to facilitate carbonyl‐ene, hydroalkenylation, and amination reactions.
在此,我们介绍了一类新型的实验室稳定的N杂环卡宾 (NHC) 镍预催化剂,用于均相镍催化。通过提出的 Heck 型机制,镍 (II) 配合物在温和条件下很容易原位活化为 Ni 0 。该预催化剂被证明可以促进羰基、加氢烯基化和胺化反应。