inexpensive and atom‐economical approach to CH bond functionalization, a cationic CoIII complex (see scheme) was used to generate nucleophilic organometallic species in situ without additional activating reagents. Under these conditions, aryl CH bonds underwent efficient addition to polar electrophiles, including α,β‐unsaturated N‐acyl pyrroles as β‐substituted ester and amide surrogates.
Brønsted Acid Enhanced Rhodium-Catalyzed Conjugate Addition of Aryl CH Bonds to α,β-Unsaturated Ketones under Mild Conditions
作者:Lei Yang、Bo Qian、Hanmin Huang
DOI:10.1002/chem.201201348
日期:2012.7.27
With a Brønsted acid as the solvent, the rhodium‐catalyzed direct addition of arylCH bonds to α,β‐unsaturated ketones was realized undermild reaction conditions (see scheme). The acid may assist by interceding in the conflict of the two proton‐transfer events and averting the substrate inhibition involved in this type of CH addition reaction.
A manganese(<scp>i</scp>)tricarbonyl-catalyst for near room temperature alkene and alkyne hydroarylation
作者:Shweta Choudhary、Diego M. Cannas、Matthew Wheatley、Igor Larrosa
DOI:10.1039/d2sc04295a
日期:——
We have rationally designed a new Mn(I)-catalyst for hydroarylation reactions that displays much improved catalytic activity over the commonly used MnBr(CO)5. Our catalyst, MnBr(CO)3(MeCN)2, avoids the formation of the off-cycle manganacycle-(CO)4 species responsible for low catalyst activity, allowing near roomtemperaturehydroarylation of alkenes and alkynes with broad functional group tolerance including