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
acetyl marks, whereas enzymatically active HDACs of classI or IIb are called “Erasers” to highlight their capability to remove acetyl groups from acetylated histones or other proteins. Small‐molecule ligands of class IIa histonedeacetylases (HDACs) have gained tremendous attention during the last decade and have been suggested as pharmaceutical targets in several indication areas such as cancer, Huntington's