Ligand- and Base-Free Pd(II)-Catalyzed Controlled Switching between Oxidative Heck and Conjugate Addition Reactions
作者:Sarah E. Walker、Julian Boehnke、Pauline E. Glen、Steven Levey、Lisa Patrick、James A. Jordan-Hore、Ai-Lan Lee
DOI:10.1021/ol400539h
日期:2013.4.19
solvent allows controlled and efficient switching between oxidative Heck and conjugateadditionreactions on cyclic Michael acceptor substrates, catalyzed by a cationic Pd(II) catalyst system. Both reactions are ligand- and base-free and tolerant of air and moisture, and the controlled switching sheds light on some of the factors which favor one reaction over the other.
Alkyne compounds with MCH antagonistic activity and medicaments comprising these compounds
申请人:Stenkamp Dirk
公开号:US20050245529A1
公开(公告)日:2005-11-03
Alkyne compounds of formula I
wherein A, B, W, X, Y, Z, R
1
, and R
2
have the meanings given herein, which have MCH-receptor antagonistic activity and are useful for preparing pharmaceutical compositions for the treatment of metabolic disorders and/or eating disorders, particularly obesity and diabetes.
enantioselective asymmetric hydrogenation of cyclic dienamides catalyzed by an Rh-DuanPhos complex has been developed, which provides a readilyaccessible method for the synthesis of chiral cyclic allylic amines in excellent enantioselectivities (up to 99% ee). The products are valuable chiralbuildingblocks and could be easily transformed to multisubstituted cyclohexane derivatives.
Examining the Scope of Deriving β-Aryl Enones from Enol Silanes as Ketone Equivalents <i>via</i> Pd(II)-Mediated Sequential Dehydrosilylation and Arylation
作者:Subba Rao Polimera、Andivelu Ilangovan、Murugaiah A. M. Subbaiah
DOI:10.1021/acs.joc.3c00502
日期:2023.6.2
Silyl enol ethers were examined as a masked source of saturated ketones to derive β-aryl enones and their derivatives by dehydrosilylation to generate enones in situ and subsequent oxidative arylation with arylboronic acids as transmetallation coupling partners using relayed Pd(II) catalysis in one pot under base-free conditions. Oxygen was found to be an efficient and green oxidant to enable both
[DE] NEUE ALKIN-VERBINDUNGEN MIT MCH-ANTAGONISTISCHER WIRKUNG UND DIESE VERBINDUNGEN ENTHALTENDE ARZNEIMITTEL<br/>[EN] NOVEL ALKYNE COMPOUNDS HAVING AN MCH-ANTAGONISTIC EFFECT, AND MEDICAMENTS CONTAINING SAID COMPOUNDS<br/>[FR] NOUVEAUX COMPOSES ALCYNE A EFFET ANTAGONISTE MCH, ET MEDICAMENTS CONTENANT CES COMPOSES