title: The chemical synthesis of the anticodon loop of an eukaryotic initiator tRNA containing the hypermodified nucleoside N6-/N-threonylcarbonyl/-adenosine/t6A/1.
abstract: In this work, the first example of chemical synthesis of oligoribonucleotide containing the hypermodified nucleoside N6-/N-threonylcarbonyl/-adenosine /t6A/ is presented. Synthesis of the heptamer C-C-C-A-U-t6A-A IX, the sequence of which is related to the anticodon loop of the initiator tRNA from yellow lupine, was achieved by: /i/ phosphotriester block synthesis of suitably protected heptamer VI containing an adenosine unit with a free exo-NH2 group, /ii/ highly effective "one-flask" procedure for the transformation of the free exo-NH2 group of adenosine unit of heptamer VI into a N,N'-disubstituted urea system of t6A of heptamer VII /hypermodification/, and /iii/ final deprotection of VIII /32% total yield/ with the use of a new approach for simultaneous hydrogenolysis /PdO-hydrogen-pyridine/ of the p-nitrobenzyl group and 2,2,2-trichloroethyl groups from carboxyl function of t6A and internucleotide phosphates respectively.
mesh_terms: D000241:Adenosine / Q000031:analogs & derivatives*; D000926:Anticodon / Q000138:chemical synthesis*; D001483:Base Sequence; D008722:Methods; D009841:Oligonucleotides; D009843:Oligoribonucleotides; D010944:Plants; D012343:RNA, Transfer / Q000138:chemical synthesis*
chemical_list: D000926:Anticodon; D009841:Oligonucleotides; D009843:Oligoribonucleotides; D012343:RNA, Transfer; D000241:Adenosine