Selective Synthesis of 3‐(α,α‐Dibromoacetyl)‐4‐hydroxy‐6‐methyl‐2H‐pyran‐2‐one as an Excellent Precursor for the Synthesis of 2‐Substituted 4‐(4‐Hydroxy‐6‐methyl‐2H‐2‐oxopyran‐3‐yl)thiazoles as Antimicrobial and Antifungal Agents

A selective synthesis of 3‐(α,α‐dibromoacetyl)‐4‐hydroxy‐6‐methyl‐2H‐pyran‐2‐one (3) has been achieved by bromination of DHA using CuBr2/CHCl3‐EtOAc. The reaction of 3 with different thioureas/thiomides/thiosemicarbazide offers a convenient and efficient method for the syntheses of 2‐substituted 4‐(4‐hydroxy‐6‐methyl‐2H‐2‐oxopyran‐3‐yl)thiazoles. These thiazoles were evaluated for their antimicrobial and antifungal activity.