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。
Synthesis of chiral tertiary trifluoromethyl alcohols by asymmetric nitroaldol reaction with a Cu(ii)-bisoxazolidine catalyst
作者:Hanhui Xu、Christian Wolf
DOI:10.1039/c0cc02378g
日期:——
A highly enantioselective and diastereoselectivecopper(II)-bisoxazolidine catalyzednitroaldolreaction with aliphatic and aromatic trifluoromethyl ketones is described.
first enantioselectivesynthesis of cyclic N,S-ketals having tetrasubstituted chiral center through intramolecular cyclization between carbonyl compounds and aminothiols has been developed. The reaction of fluoroalkyl ketones with aminobenzenethiols using a chiral imidazoline−phosphoric acid catalyst afforded products in high yields with high enantioselectivity. The observed enantioselectivity is explained