How to Synthesize A tRNA

Abstract New blocking group combinations have been investigated to achieve an automated synthesis of a tRNA and structural analogs on solid-support. The use of the 4-methoxytetrahydropyranyl group for 2′-OH-protection and the dansylethoxycarbonyl group for the 5′-OH position shows in the phosphoramidite approach good results. In the arabino series the 2-(4-nitrophenyl)ethoxycarbonyl group is a perfect 2′-OH blocking group which can be combined with the dimethoxytrityl residue in the usual manner to give high yields and pure materials.