Facile conversion of pyridine propargylic alcohols to enones: stereochemistry of protonation of allenol
作者:Ramazan Erenler、Jean-François Biellmann
DOI:10.1016/j.tetlet.2005.06.087
日期:2005.8
The conversion of 4-pyridyl propargylic alcohols 1 to the (E)-propenones 3 and propynones 2 occurs under mild reaction conditions, pyridinium chloride in methanol at room temperature. (Z)-4-Pyridyl propenones 11 are detected as initial products when large substituents such as trimethylsilyl, tert-butyl and phenyl are attached at C-3 of the propynols and these (Z)-enones 11 are isomerised to the (E)-isomers