Novel 2,2-Bipyridine Ligand for Palladium-Catalyzed Regioselective Carbonylation
摘要:
[GRAPHICS]A palladium-catalyzed highly regioselective one-step carbonylation of 2,5-dibromo 3-methylpyridine is reported. A range of alkyl esters and amides can be prepared in good yield with better than 95:5 regioselectivity via this method. Key to the high regioselectivity for the formation aromatic amides is the introduction of a novel nonphosphine based 2,2 bipyridine ligand, This novel reaction was scaled up smoothly in the plant to a 130-kg batch size and facilitated the delivery of bulk material for the clinical trials of Sch 66336, a candidate for oncologic treatments.
[GRAPHICS]A palladium-catalyzed highly regioselective one-step carbonylation of 2,5-dibromo 3-methylpyridine is reported. A range of alkyl esters and amides can be prepared in good yield with better than 95:5 regioselectivity via this method. Key to the high regioselectivity for the formation aromatic amides is the introduction of a novel nonphosphine based 2,2 bipyridine ligand, This novel reaction was scaled up smoothly in the plant to a 130-kg batch size and facilitated the delivery of bulk material for the clinical trials of Sch 66336, a candidate for oncologic treatments.