Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... A series of enantiomerically pure alkyl substituted peptide nucleic acid (PNA) monomers were synthesized by incorporating novel α-amino acids produced by the Et-DuPHOS-Rh + catalytic asymmetric hydrogenation of enamido esters. ... Thompson, SAet al., US Patent No. WO ...