Synthesis of 2,4-Disubstituted Thiazoles from (<i>Z</i>)-(2-Acetoxyvinyl)phenyl-λ<sup>3</sup>-iodanes: Nucleophilic Substitution of α-λ<sup>3</sup>-Iodanyl Ketones with Thioureas and Thioamides
l-lambda(3)-iodanes react with thioureas or thioamides in MeOH to give 2,4-disubstituted thiazoles directly in good yields. The reaction probably involves generation of highly reactive alpha-lambda(3)-iodanyl ketones through ester exchange of the beta-acetoxy group with liberation of methyl acetate, followed by nucleophilic substitutions with thioureas or thioamides.