Abstract
To construct modified RNA that form A-type duplex with photo-irradiation, a photocleavable a-methyl-2-nitropiperonyl (MeNP) group was introduced at O(6) position of guanosine. A guanosine phosphoramidite derivative containing the MeNP group was synthesized via regioselective 2'-O-protection of 3',5'-O-di(t-butyl)silanediylguanosine with TBDMS group. The MeNP group was found to be stable under conditions of solid-phase synthesis of RNA. The MeNP group was also found to be removable by UV irradiation at wavelength of 365 nm for 10 min.
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