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.
Rhodium(III)-Catalyzed Selective Monoarylation of β or γ C(sp<sup>3</sup>)–H Bonds Assisted by a Trimethylpyrazole Group
作者:Chunchen Yuan、Guangliang Tu、Yingsheng Zhao
DOI:10.1021/acs.orglett.6b03522
日期:2017.1.20
The selective arylation of unactivated beta or challenging gamma primary and secondary beta-C(sp(3))-H bonds has been developed with a Cp*Rh(III) catalyst assisted by a trimethylpyrazole group. A rarely reported six-membered, rhodacycle has been identified in rhodium-catalyzed C(sp(3))-H activation reactions. Preliminary mechanistic studies have revealed that a concerted metalation-deprotonation pathway might be involved in the C-H activation step.
Rhodium-Catalyzed Asymmetric Hydroarylation of 3-Pyrrolines Giving 3-Arylpyrrolidines: Protonation as a Key Step
作者:Chau Ming So、Satoshi Kume、Tamio Hayashi
DOI:10.1021/ja406169s
日期:2013.7.31
A hydroxorhodium complex coordinated with (R)-segphos was found to catalyze the hydroarylation of 3-pyrrolines with arylboroxines under neutral conditions to give 3-arylpyrrolidines with high enantioselectivity in high yields.