A new alternative to Stryker's reagent in hydrosilylation: synthesis, structure, and reactivity of a well-defined carbene–copper(ii) acetate complex
作者:Jaesook Yun、Daesung Kim、Hoseop Yun
DOI:10.1039/b509964a
日期:——
A new, air stable and well-defined carbeneâcopper(II) complex has been prepared, which is an efficient precatalyst for the 1,2- and 1,4-reduction of carbonyl compounds under hydrosilylation conditions.
Borrowing Hydrogen: Indirect “Wittig” Olefination for the Formation of C–C Bonds from Alcohols
作者:Phillip J. Black、Michael G. Edwards、Jonathan M. J. Williams
DOI:10.1002/ejoc.200600070
日期:2006.10
development of an indirect three-step domino sequence for the formation of C-Cbondsfromalcohol substrates is described. An iridium-catalysed dehydrogenation of alcohol I affords the intermediate aldehyde 2. The desired C-C bond can then be formed by a facile Wittigolefination, yielding the intermediate alkene 3. In the final step the alkene is hydrogenated to afford the indirectWittig product, the
描述了从醇底物形成 CC 键的间接三步多米诺骨牌序列的成功开发。醇 I 的铱催化脱氢得到中间体醛 2。然后可以通过简单的 Wittig 烯化形成所需的 CC 键,产生中间体烯烃 3。在最后一步中,烯烃被氢化以提供间接的 Wittig 产物,即烷烃 4. 这个过程的关键是借氢的概念;在最初的脱氢步骤中除去的氢气被铱催化剂简单地借用。作为储氢器,催化剂促进 CC 键的形成,然后在最后一步返回借用的氢。在此,我们将详细介绍我们对底物和反应范围以及催化循环的局限性的研究。((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)。
Enantioselective Electrophilic Amination of α-Cyanothioacetates with Azodicarboxylates Catalyzed by an Axially Chiral Guanidine Base
作者:Masahiro Terada、Daisuke Tsushima、Megumi Nakano
DOI:10.1002/adsc.200900594
日期:2009.11
An enantioselectiveelectrophilicamination of α-substituted cyanothioacetates with azodicarboxylate is demonstrated using an axiallychiralguanidine as a chiral Brønsted base catalyst. The corresponding product, having a quaternary stereogenic center at the α-carbon atom, is formed in excellent enantioselectivity.
Highly efficient conjugate reduction of α,β-unsaturated nitriles catalyzed by copper/xanthene-type bisphosphine complexes
作者:Daesung Kim、Bu-Mahn Park、Jaesook Yun
DOI:10.1039/b418586b
日期:——
Alpha,beta-unsaturated nitriles are chemoselectively reduced to the corresponding saturated nitriles in high yields using a copper-DPEphos or Xantphos complex as catalyst in the presence of polymethylhydrosiloxane (PMHS) as the stoichiometric reducing agent and t-butanol as additive.
The monoalkylation of acetonitrile by primaryalcohols was achieved in a one-pot sequence in the presence of iridium catalysts. A diversity of nitriles has been obtained from aryl- and alkyl-methanols in excellent yield.