摘要:
                                Lithiation of 1-methyl-4-quinolone and 1-methylquinoline-4-thione with lithium diisopropylamide (LDA) at -78-degrees-C takes place at C-2.  The resulting lithio-species react with a variety of electrophiles to give 2-substituted-4-quinolones and -quinolines-4-thiones respectively.  1-Methylquinoline-4-thione is easily converted into 1-methyl-4-quinolone in protic solution.