Our group is working on the development of reliable access to biologically relevant, long, and modified RNA sequences. Here, we briefly present the chemical synthesis of such sequences with 2?-O-triisopropylsilyloxymethyl (= 2?-O-tom) protected ribonucleoside phosphoramidites, their template-directed enzymatic ligation, and some examples of modified nucleotides, designed to promote structural and biological studies.
