Add time:08/19/2019         Source:sciencedirect.com

Substitution reactions on 2′,3′,5′,6′-tetrachloro-4-dimethylamino-[1,4]bipyridinyl-1-ylium chloride with nitrogen nucleophiles such as n-propylamine, isopropylamine, glycine, morpholine, and piperidine were examined. Highly functionalized Cl2,Cl3,N4,Cl5,Cl6- and N2,Cl3,N4,Cl5,Cl6-substituted pyridines were obtained, in part possessing unsubstituted 4-amino groups due to dealkylation. Detailed NMR studies were performed in order to elucidate the regiochemistry of these dealkylations.

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