Mild and Regioselective N-Alkylation of 2-Pyridones in Water
摘要:
A mild and regioselective N-alkylation reaction of 2-pyridones in water has been developed. Tween 20 (2% w/w) was added to create a micellar system for improved solubility of starting materials, which leads to enhanced reaction rates. The protocol demonstrated a wide substrate scope with good isolated yield's (40-94%) for all of the 24 examples evaluated. High regioselectivity favoring N-alkylation over O-alkylation was observed for benzyl halides (>5:1), primary alkyl halides (>6:1), and bulky and less reactive secondary alkyl halides (>2.4:1).
Selective N-functionalization of 6-substituted-2-pyridones
作者:Hui Liu、Sung-Bo Ko、Hubert Josien、Dennis P. Curran
DOI:10.1016/0040-4039(95)01917-7
日期:1995.12
6-Substituted-2-pyridones can be selectively N-alkylated by treatment with NaH/LiBr in a mixture of DMF and DME. Yields of N-propargylated, N-allylated, and other N-functionalized products are good, and only small amounts of the isomeric O-alkylated product (<10%) are typically formed.