Synthesis and characterization of thiochromone S,S-dioxides as new photolabile protecting groups

Abstract
3-Arylthiochromone derivatives were synthesized as new photolabile protecting groups, in which the photoreactivity was switchable based on oxidation of the sulfur atom (sulfide and sulfone); the protected substrates 9,14 released the corresponding alcohols, amines or carbonxylic acids almost quantitatively under UV-light in neutral condition and the photoproduct 10 showed high fluorescence intensity.