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 , released the corresponding alcohols, amines or carbonxylic acids almost quantitatively under UV-light in neutral condition and the photoproduct showed high fluorescence intensity.

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The reaction of the 4,5-oxazoline derivative of sialic acid with various alcohols was effectively promoted by a catalytic amount of montmorillonite K-10 clay supported Bi(OTf) 3 to produce a variety of 3,4-unsaturated sialic acids via the Ferrier glycosylation reaction in moderate yields.

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