A CONVENIENT SYNTHESIS OF SUBSTITUTED PYRIDYLGLYCOLS PROMOTED BY AQUEOUS TITANIUM TRICHLORIDE

Article abstract of DOI:10.1016/S0040-4020(01)91888-5

2- and 4-Acetylpyridines, and 2- and 4-pyridinealdehydes when allowed to react with two-equiv. of aqueous titanium trichloride add to the carbonyl carbon atom of simple ketones (acetone, cyclopentanone, cyclohexanone) and aldehydes (acetaldehyde, propionaldehyde, benzaldehyde) affording substituted pyridylglycols in very good yields.The present one-pot method has considerable advantage over the existing procedure.The reaction is discussed in terms of a radical mechanism in which the Ti(III) species plays the fundamental role.