A Convergent Regiospecific Synthesis of the Lariat-Trinucleotides and A2′p 5′Gand A2′p 5′G3′p 5′Cfrom A O4-2-Nitrophenyl) -Uridine Building Block

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Abstract
Total synthesis of title compounds 1_ and 2_ from a common intermediate 7 is reported using the phosphotriester-phosphiteamidite approach. Appropriate NMR evidence has been presented in support of the regiospecific synthesis of target molecules in addition to enzymatic analysis. Present work clearly shows that the NMR evidence is mandatory to establish the isomeric purity of branched RNA molecules; enzymatic or/and electrophoretic analysis alone as tools for confirmation of branched RNA structures can be misleading.