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J Org Chem. 2019 Feb 1;84(3):1276-1287. doi: 10.1021/acs.joc.8b02714. Epub 2019 Jan 22.

Synthesis of ( R)- and ( S)-Fmoc-Protected Diethylene Glycol Gamma PNA Monomers with High Optical Purity.

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Institute for Biomolecular Design and Discovery (IBD) and Department of Chemistry , Carnegie Mellon University , 4400 Fifth Avenue , Pittsburgh , Pennsylvania 15213 , United States.


A robust synthetic route has been developed for preparing optically pure, Fmoc-protected diethylene glycol-containing ( R)- and ( S)-╬│PNA monomers. The strategy involves the application of 9-(4-bromophenyl)-9-fluorenyl as a temporary, safety-catch protecting group for the suppression of epimerization in the O-alkylation and reductive amination steps. The optical purities of the final monomers were determined to be greater than 99.5% ee, as assessed by 19F-NMR and HPLC. The new synthetic methodology is well-suited for large-scale monomer production, with most synthetic steps providing excellent chemical yields without the need for chromatographic purification other than a simple workup and precipitation.


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