Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2008, Issue 34, Pages 5786-5797Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.200800891
Keywords
Peptide nucleic acids; Guanine; Protecting groups; Solid-phase synthesis
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Funding
- University of Sassari
- Fondazione Banco di Sardegna and MIUR (Rome)
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A straightforward synthesis of orthogonally protected PNA monomers is described. Protected aminoethylglycine (Aeg) monomers were efficiently prepared by reductive amination of N-Fmoc-glycinaldehyde with glycine methyl ester and the subsequent acylation of the free amine with N-bis-Boc-protected nucleobase acetic acids. The exocyclic amine group of the nucleobases, including the notoriously difficult-to-protect guanine nucleobase, was protected with a bis-Boc carbamate group; this increased the solubility of the nucleobases in the most common organic solvents. The current protocol allows all Aeg monomers to be prepared on both the micro- and macroscale, which avoids or minimizes the use of toxic reagents or solvents, and moreover, cheap starting materials are used. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
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