Ni- and Pd-Catalyzed Synthesis of Substituted and Functionalized Allylic Boronates
摘要:
Two highly efficient and convenient methods for the synthesis of functionalized and substituted allylic boronates are described. In one procedure, readily available allylic acetates are converted to allylic boronates catalyzed by Ni/PCy3 or Ni/PPh3 complexes with high levels of stereoselectivity and in good yields. Alternatively, the borylation can be accomplished with commercially available Pd catalysts [e.g., Pd-2(dba)(3), PdCl2, Pd/C], starting with easily accessed allylic halides.
Allylic C−H Acetoxylation with a 4,5-Diazafluorenone-Ligated Palladium Catalyst: A Ligand-Based Strategy To Achieve Aerobic Catalytic Turnover
作者:Alison N. Campbell、Paul B. White、Ilia A. Guzei、Shannon S. Stahl
DOI:10.1021/ja105829t
日期:2010.11.3
Pd-catalyzed C-H oxidation reactions often require the use of oxidants other than O(2). Here we demonstrate a ligand-based strategy to replace benzoquinone with O(2) as the stoichiometric oxidant in Pd-catalyzed allylic C-H acetoxylation. Use of 4,5-diazafluorenone (1) as an ancillary ligand for Pd(OAc)(2) enables terminal alkenes to be converted to linear allylic acetoxylation products in good yields
Mechanistic investigations of bipyrimidine-promoted palladium-catalyzed allylic acetoxylation of olefins
作者:Bo-Lin Lin、Jay A Labinger、John E Bercaw
DOI:10.1139/v08-133
日期:2009.1.1
(bipyrimidine)Pd(OAc)2. No KIE is observed for the competition experiment between allylbenzene-d0 and allylbenzene-d5 (CD2=CDCD2C6H5), suggesting that allylic C–H activation is not rate-determining. Catalytic allylicacetoxylations of other terminal olefins as well as cyclohexene were also effected by (bipyrimidine)Pd(OAc)2.
Highly Robust and Efficient Blechert-Type Cyclic(alkyl)(amino)carbene Ruthenium Complexes for Olefin Metathesis
作者:Antonio Del Vecchio、Jakub Talcik、Sophie Colombel-Rouen、Jan Lorkowski、Melinda R. Serrato、Thierry Roisnel、Nicolas Vanthuyne、Guy Bertrand、Rodolphe Jazzar、Marc Mauduit
DOI:10.1021/acscatal.3c01208
日期:2023.5.5
catalytic performances at low catalytic loading (up to 0.005 mol %) in ring-closingmetathesis (RCM), macro-RCM, ring-closingenynemetathesis (RCEYM), cross-metathesis (CM), ethenolysis and ring-opening crossmetathesis (ROCM). Moreover, up to 95% enantiomeric excess (ee) was obtained in asymmetric ring-opening crossmetathesis (AROCM) and 57% ee was obtained in asymmetric cross-metathesis (ACM).