A simple Cu-catalyzed coupling approach to substituted 3-pyridinol and 5-pyrimidinol antioxidants.
A convenient approach to 3-pyridinols and 5-pyrimidinols via a two-step Cu-catalyzed benzyloxylation/catalytic hydrogenation sequence is presented. The corresponding 3-pyridinamines and 5-pyrimidinamines can be prepared in an analogous sequence utilizing benzylamine in lieu of benzyl alcohol. The radical-scavenging ability of these derivatives are preliminarily explored and reveal that the increased acidities of the pyridinols and pyrimidinols render them susceptible to more significant kinetic solvent effects when compared to phenols.
Nara
Susheel J
SJ
Department of Chemistry, Queen's University, Kingston, ON, Canada K7L 3N6.
Jha
Mukund
M
Brinkhorst
Johan
J
Zemanek
Tony J
TJ
Pratt
Derek A
DA
D000975:Antioxidants / Q000737:chemistry*; D001554:Benzene / Q000737:chemistry; D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D007700:Kinetics; D008956:Models, Chemical; D009570:Nitriles / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D019800:Phenol / Q000737:chemistry; D011725:Pyridines / Q000737:chemistry*; D011743:Pyrimidines / Q000737:chemistry; D013696:Temperature; D024502:alpha-Tocopherol / Q000737:chemistry
D000975:Antioxidants; D009570:Nitriles; D011725:Pyridines; D011743:Pyrimidines; D019800:Phenol; D003300:Copper; C005557:propionitrile; D024502:alpha-Tocopherol; D001554:Benzene; D010100:Oxygen