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A convenient and highly efficient synthesis of one kind of peptide nucleic acid monomer

X Tang
G Tang
H Wang
L Luo
D Yang


S-Thyminyl-L-cysteine methyl ester hydrochloride (compound 1), a non-classical peptide nucleic acid monomer, was synthesized through the key intermediate, N-tert- butoxycarbonyl-S-thyminyl-L-cysteine (compound 3), which afforded from the reaction of S-thyminyl-L-cysteine hydrochloride (compound 2) with di-tert-butyl dicarbonate (Boc2O). This was followed by the esterification and deprotection of compound 3 at an overall yield of 82%. The mixture of thionyl chloride and methanol was found as an efficient reagent for simultaneous deprotection of tert-butoxycarbonyl (Boc) group and esterification of carboxy group of compound 3. This high-yield two-step method was also applied to other analogues of compound 1 successfully. The chemical structures of four new compounds (5a-5d) were confirmed by 1H NMR and 13C NMR.


KEY WORDS: Thionyl chloride, Esterification, Deprotection, Peptide nucleic acid


Bull. Chem. Soc. Ethiop. 2012, 26(3), 415-420.


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eISSN: 1726-801X
print ISSN: 1011-3924