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