Reactions of pyridinium ylides with aldehydes and with Michael acceptors
Abstract
1-Methyl and 1-allyl-2,4,6-triphenylpyridinium cations react with aromatic aldehydes at the α-CH2 to give aldol products (7) and (8). The allyl adducts (8) were thermally converted into aldehydes and ketones, whereas thermolysis of (7) took a variety of courses. Zwitterions from 1-methylpyridinium cations were also added Michael-fashion to activated carbon–carbon double bonds.