A comparison of N- versus O-alkylation of substituted 2-pyridones under Mitsunobu conditions
作者:Matthew C. Torhan、Norton P. Peet、John D. Williams
DOI:10.1016/j.tetlet.2013.05.054
日期:2013.7
2-Pyridones are well-known ambident nucleophiles which are capable of reacting with electrophiles through either the nitrogen or oxygen atom to form N-alkyl-2-pyridones or 2-alkoxypyridines, respectively. It has been shown that the ratio of these products can be affected by a number of factors including the nature of the electrophile, the base used for deprotonation, and the solvent. We have now discovered a relationship between the ratio of N- and O-alkylation products and the nature of substituents on the pyridone ring when the Mitsunobu reaction is used to alkylate 2-pyridones. (C) 2013 Elsevier Ltd. All rights reserved.
SYNTHESIS OF SOME NEW 2-ARYLOXY AND 2-ALKYLOXY PYRIDINES
Here we report a palladium-catalyzed anti-Michael-type hydroamination of N-(quinolin-8-yl)acrylamide with 2-pyridones. The use of a palladium catalyst enables the α-addition of 2-pyridones, resulting in the formation of a range of N-substituted 2-pyridone carboxamides with yields ranging from 10% to 80%. Derivatization of the products highlights the utility of this transformation. Preliminary mechanistic