The tRNA “WOBBLE POSITION” Uridines. III.1the Synthesis of 5-[S-Methoxycarbonyl (Hydroxy)Methyl] Uridine and its 2-Thio Analogue

Abstract
The diastereoisomers 2a, 2b and their 2-thio analogues 4a and 4b were obtained by three-step transformation of uridine and 2-thiouridine, respectively. The absolute configuration at C-51 in 2a and 2b was established by CD, while for 4a and 4b the configurational assignment was based on the chemical correlation. The acids 1 and 3 were obtained by alkaline hydrolysis of 2a and 4a, respectively.