Nitrogen-Directed Ortho-Selective Homocoupling of Aromatic Compounds Catalyzed by Ruthenium Complexes
摘要:
A nitrogen-directed regioselective homocoupling reaction of aromatic compounds has been found to be catalyzed by a ruthenium complex in the presence of methallyl acetate as a hydrogen scavenger.
for C-H allylation of aryl oxazolines using allylic alcohols as the coupling partner. The present transformation unravels the unusual reactivity of allylic alcohols in the synthesis of 4-methyleneisochroman-1-ones and C-H-allylated products. A complete switch in the product selectivity was observed with substrate control and tuning the reaction conditions. The approach employs allylalcohols as an efficient
Cobalt-Catalyzed C−H Functionalizations by Imidate Assistance with Aryl and Alkyl Chlorides
作者:Ruhuai Mei、Lutz Ackermann
DOI:10.1002/adsc.201600384
日期:2016.7.28
inexpensive cobalt(II) acetylacetonate [Co(acac)2] and an N‐heterocyclic carbene (NHC) ligand enabled versatile C−H arylations by oxazoline assistance. The broadly applicable, low‐valent cobalt catalyst displayed a wide substrate scope, and even proved applicable to challenging C−H alkylations with β‐hydrogen‐containing primary and secondary alkyl chlorides. The power of the cobalt‐catalyzed C−H arylation