[Synthesis of thiazolo[3,2-a]pyridine derivatives and their reactions]

By the reaction of 2-benzoylmethyl-4-methylthiazole (6) with polarized olefins (3, 4) in the presence of base (K2CO3 or NaH), the corresponding thiazolo[3,2-a]pyridine derivatives (7, 8) were obtained. Methylsulfinylthiazolopyridine derivative (11) obtained by the reaction of 8b with m-chloroperbenzoic acid (MCPBA), easily underwent nucleophilic substitution to give the corresponding substituted compounds (10, 12).