Chiral Ru-Based Complexes for Asymmetric Olefin Metathesis: Enhancement of Catalyst Activity through Steric and Electronic Modifications
摘要:
Design, synthesis, characterization, and catalytic activity of six enantiomerically pure Ru-based metathesis catalysts are disclosed (3a-3f). The new chiral catalysts were prepared through steric and electronic alterations of the parent catalyst system (3). The present studies indicate that the effect of structural modifications of chiral complex 3 does not always correspond to those of the related achiral complexes. The present findings illustrate that modified Ru complexes (3e and 3f) deliver reactivity levels that are more than 2 orders of magnitude higher than 3. Reactivity and physical data are provided that shed light on the origin of activity differences. Some members of the new generation of chiral Ru catalysts promote asymmetric ring-opening (AROM) and ring-closing (ARCM) metatheses that cannot be effected by the first generation chiral catalyst (3).
[EN] ANTIPROLIFERATIVE BENZO [B] AZEPIN- 2 - ONES<br/>[FR] BENZO[B]AZÉPIN-2-ONES INHIBITRICES DE LA PROLIFÉRATION
申请人:HOFFMANN LA ROCHE
公开号:WO2014009495A1
公开(公告)日:2014-01-16
Disclosed are compounds of Formula (I) or pharmaceutically acceptable salts thereof, wherein W, X, Y, Z, R1, R2, R3 and R4 are described in this application, and methods of using said compounds in the treatment of cancer.
Copper-Catalyzed Oxidative Trifluoromethylation of Terminal Alkynes and Aryl Boronic Acids Using (Trifluoromethyl)trimethylsilane
作者:Xueliang Jiang、Lingling Chu、Feng-Ling Qing
DOI:10.1021/jo202566h
日期:2012.2.3
copper-mediated oxidative trifluomethylation of terminalalkynes and aryl boronic acids. This method allows a wide range of functional group tolerant trifluoromethylated acetylenes and arenes to be easily prepared. After the preliminary mechanistic studies of the oxidativetrifluoromethylation of terminalalkyne, an efficient copper-catalyzed oxidativetrifluoromethylation of terminalalkynes and aryl boronic
Copper-Mediated Oxidative Trifluoromethylation of Boronic Acids
作者:Lingling Chu、Feng-Ling Qing
DOI:10.1021/ol1023135
日期:2010.11.5
A copper-mediated oxidative cross-coupling of aryl- and alkenylboronic acids with (trifluoromethyl)trimethylsilane (Me3SiCF3) under mild conditions has been developed. This method allows a wide range of functional group tolerant trifluoromethylated arenes and alkenes to be easily prepared. This oxidative trifluoromethylation has the potential to introduce trifluoromethyl groups into advanced, highly
Oxidative Trifluoromethylation of Arylboronates with Shelf-Stable Potassium (Trifluoromethyl)trimethoxyborate
作者:Bilal A. Khan、Annette E. Buba、Lukas J. Gooßen
DOI:10.1002/chem.201102652
日期:2012.2.6
Introducing CF3: Arylboronic acid pinacol esters are converted into the corresponding benzotrifluorides with the easy‐to‐use one‐component trifluoromethylating reagent potassium (trifluoromethyl)trimethoxyborate, mediated by copper acetate under an oxygen atmosphere (see scheme).
Disclosed are compounds of Formula (I) or pharmaceutically acceptable salts thereof, wherein W, X, Y, Z, R
1
, R
2
, R
3
and R
4
are described in this application, and methods of using said compounds in the treatment of cancer.