Cobalt-Catalyzed Ortho-Arylation of Aromatic Imines with Aryl Chlorides
摘要:
An ortho-arylation reaction of aromatic imines with aryl chlorides has been achieved using a cobalt N-heterocyclic carbene catalyst in combination with a neopentyl Grignard reagent. The reaction takes place at room temperature to afford biaryl products in moderate to good yields.
A unique effect of styrene additive on product selectivity was observed for RuH2(CO)(PPh3)3-catalyzed C−H arylation of acetophenone derivatives bearing two ortho C−H bonds. Without styrene, the C−H arylation with arylboronates gives diarylation products as the major products throughout the reaction, but the use of styrene as an additive switches the product selectivity and leads to selective formation
An ortho-arylation reaction of aromatic imines with aryl chlorides has been achieved using a cobalt N-heterocyclic carbene catalyst in combination with a neopentyl Grignard reagent. The reaction takes place at room temperature to afford biaryl products in moderate to good yields.