Synthesis of enantiopure α-Tfm-proline and α-Tfm-pipecolic acid from oxazolo-pyrrolidines and -piperidines
作者:Clément A. Sanchez、Charlène Gadais、Sitan Diarra、Andrea Bordessa、Nathalie Lensen、Evelyne Chelain、Thierry Brigaud
DOI:10.1039/d1ob01173a
日期:——
and α-Tfm-pipecolic acid were synthesized starting from commercially available diesters and ethyltrifluoroacetate. A Strecker type reaction on intermediate chiral Tfm-oxazolo-pyrrolidine and -piperidine provided the corresponding nitrile precursor of enantiopure (R) and (S) α-Tfm-proline and α-Tfm-pipecolic acid. The C-terminal peptide coupling reaction of α-Tfm-pipecolic acid has been successfully
对映体纯 α-Tfm-脯氨酸和 α-Tfm-哌啶酸是从市售的二酯和三氟乙酸乙酯开始合成的。中间体手性 Tfm-恶唑并吡咯烷和哌啶的 Strecker 型反应提供了相应的对映体纯 ( R ) 和 ( S ) α-Tfm-脯氨酸和 α-Tfm-哌啶酸的腈前体。成功实现了α-Tfm-哌啶酸的C端肽偶联反应。
Convenient Synthesis of<i>N</i>-Terminal Tfm-Dipeptides from Unprotected Enantiopure α-Tfm-Proline and α-Tfm-Alanine
A convenient procedure for the synthesis of highly lipophilic dipeptide building blocks fromenantiopure α-trifluoromethyl α-amino acids is reported. Coupling reactions at the C termini of the trifluoromethyl α-amino acids were successfully performed with totally unprotected amino acids without formation of diketopiperazines. The synthesis of a tripeptide through a coupling reaction at the deactivated
Iodocyclization of Chiral CF<sub>3</sub>-Allylmorpholinones: A Versatile Strategy for the Synthesis of Enantiopure α-Tfm-Prolines and α-Tfm-Dihydroxyprolines
An efficient iodocyclization reaction of a chiral Tfm-allylmorpholinone provides a straightforward route to alpha-Tfm-prolines and alpha-Tfm-dihydroxyprolines. The methodologies developed are particularly well adapted for gram-scale synthesis of enantiopure compounds.