1-0-(2-propenyl)-6-0-sulfonylpyranosides

A 1-O-(2-propenyl)-6-O-sulfonylpyranoside represented by formula (A):

• wherein R1, R2 and R3 each independently represents an unsubstituted alkyl group having 1 or 2 carbon atoms, a substituted alkyl group having 1 or 2 carbon atoms in its alkyl moiety and substituted with an alkoxy group having 1 or 2 carbon atoms, a substituted alkyl group having 1 or 2 carbon atoms in its alkyl moiety and substituted with a phenyl group, a substituted alkyl group having 1 or 2 carbon atoms in its alkyl moiety and substituted with a p-methoxyphenyl group, a substituted silyl group substituted with an alkyl group having 1-4 carbon atoms, or a substituted silyl group substituted with an aryl group having 6 carbon atoms, and
• R4 represents an alkylsulfonyl group having 1 or 2 carbon atoms in its alkyl moiety, an arylsulfonyl group whose aryl moiety is a phenyl, or an arylsulfonyl group whose aryl moiety is a substituted phenyl substituted with p-methyl or p-methoxy.