Photodissociable protective group

A method of producing a compound represented by Formula (3):

• wherein Ar1 is an optionally substituted aromatic or heteroaromatic ring, Ar2 is an optionally substituted aryl or heteroaryl group, X is a leaving group, and n is an integer of 1 or 2,
• wherein the aromatic or heteroaromatic ring of Ar1 is selected from the group consisting of a benzene ring, a naphthalene ring, an anthracene ring, a phenanthrene ring, a fluorene ring, a dibenzo[b,d]furan ring, a pyridine ring, a pyrimidine ring, and a pyrazine ring;
• wherein the optionally substituted aromatic ring Ar1 and/or the optionally substituted aryl group Ar2 has one to three substituents selected from the group consisting of an alkyl group, a haloalkyl group, an alkoxy group, a dialkylamino group, a halogen atom, a cyano group, and a nitro group;
• wherein the leaving group X is selected from the group consisting of a halogen atom, an imidazolyl group, and a pentafluorophenyl group;
• wherein the method comprises reacting a compound represented by Formula (1):
• wherein Ar1, Ar2, and n are as defined above, with a compound represented by Formula (2):
• wherein X are the same or different, and each represent the leaving group as defined above, or an equivalent thereof.

A method of protecting an amino group or hydroxyl group, comprising reacting the amino group or hydroxyl group with a compound represented by Formula (3):

• wherein Ar1 is an optionally substituted aromatic or heteroaromatic ring, Ar2 is an optionally substituted aryl or heteroaryl group, X is a leaving group, and n is an integer of 1 or 2,
• wherein the aromatic or heteroaromatic ring of Ar1 is selected from the group consisting of a benzene ring, a naphthalene ring, an anthracene ring, a phenanthrene ring, a fluorene ring, a dibenzo[b,d]furan ring, a pyridine ring, a pyrimidine ring, and a pyrazine ring;
• wherein the optionally substituted aromatic ring Ar1 and/or the optionally substituted aryl group Ar2 has one to three substituents selected from the group consisting of an alkyl group, a haloalkyl group, an alkoxy group, a dialkylamino group, a halogen atom, a cyano group, and a nitro group;
• and
• wherein the leaving group X is selected from the group consisting of a halogen atom, an imidazolyl group, and a pentafluorophenyl group.