A novel and efficient method for selective Michael addition of 2-pyridones to ethenesulfonyl fluoride (ESF) and 1-bromoethene-1-sulfonyl fluoride (BESF) has been developed for constructing a class of pyridonyl aliphatic sulfonyl fluorides and pyridonyl vinyl sulfonyl fluorides in good to excellent yields. This practical method features easy operation, wide substrate scope, and mild reaction conditions.
Key words
2-pyridones - pyridonyl vinyl sulfonyl fluorides - Michael addition - pyridonyl aliphatic sulfonyl fluorides - click chemistry