Synthesis 2019; 51(04): 976-984
DOI: 10.1055/s-0037-1610304
paper
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Fmoc- and Boc-Protected (2S,5S)- and (2R,5R)-5-Aminomethylprolines

Amelie L. Bartuschat
,
Nina Hegmann
,
Department of Chemistry and Pharmacy, Pharmaceutical Chemistry, Friedrich- Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany   Email: markus.heinrich@fau.de
› Author Affiliations
Deutsche Forschungsgemeinschaft HE5413/6-1
Further Information

Publication History

Received: 11 September 2018

Accepted: 17 September 2018

Publication Date:
25 October 2018 (online)


Abstract

The proline derivatives (2S,5S)dmamPro, (2S,5S)N-Boc-amPro and (2R,5R)dmamPro are useful building blocks for peptides since they allow conformational fixation of peptidyl–CO–N-prolyl bonds in the unusual cis conformation. The stereoselective syntheses of these dimethylaminomethyl-prolines is achieved from literature-known precursors with overall yields of 23% [over 8 steps for (2S,5S)dmamPro], 33% [over 9 steps for (2S,5S)N-Boc-amPro] and 12% [over 8 steps for (2R,5R)dmamPro]. The applicability of (2S,5S)N-Boc-amPro in peptide synthesis is demonstrated through the preparation of an Fmoc-Val-amPro-OMe dipeptide.

Supporting Information