Debiec K, Sochacka E. Efficient access to 3'-
O-phosphoramidite derivatives of tRNA related
N 6-threonylcarbamoyladenosine (t
6A) and 2-methylthio-
N 6-threonylcarbamoyladenosine (ms
2t
6A).
RSC Adv 2021;
11:1992-1999. [PMID:
35424152 PMCID:
PMC8693639 DOI:
10.1039/d0ra09803e]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 12/15/2020] [Indexed: 12/11/2022] Open
Abstract
An efficient method of ureido linkage formation during epimerization-free one-pot synthesis of protected hypermodified N 6-threonylcarbamoyladenosine (t6A) and its 2-SMe analog (ms2t6A) was developed. The method is based on a Tf2O-mediated direct conversion of the N-Boc-protecting group of N-Boc-threonine into the isocyanate derivative, followed by reaction with the N 6 exo-amine function of the sugar protected nucleoside (yield 86-94%). Starting from 2',3',5'-tri-O-acetyl protected adenosine or 2-methylthioadenosine, the corresponding 3'-O-phosphoramidite monomers were obtained in 48% and 42% overall yield (5 step synthesis). In an analogous synthesis, using the 2'-O-(tert-butyldimethylsilyl)-3',5'-O-(di-tert-butylsilylene) protection system at the adenosine ribose moiety, the t6A-phosphoramidite monomer was obtained in a less laborious manner and in a remarkably better yield of 74%.
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