Dual‐protected amino acid derivatives as new antitubercular agents
作者:Pedro P. Castro、Débora L. Campos、Fernando R. Pavan、Giovanni W. Amarante
DOI:10.1111/cbdd.13315
日期:2018.8
drug-resistant rates. In an attempt to develop new antitubercular agents, 35 compounds were synthesized, most of them bearing a carbamate and enantiopure aminoacid moiety. These compounds had their activity evaluated toward a Mycobacterium tuberculosis strain (ATCC 27294) and cytotoxicity against fibroblast MRC-5 cells (ATCC CCL-171). Three of the prepared derivatives presented a good antimicrobial inhibition
Design of an Organocatalyst for the Enantioselective Diels−Alder Reaction with α-Acyloxyacroleins
作者:Kazuaki Ishihara、Kazuhiko Nakano
DOI:10.1021/ja053368a
日期:2005.8.1
derived from H-l-Phe-l-Leu-N(CH2CH2)2. The enantioselective Diels-Alderreaction of 5-(benzyloxymethyl)cyclopentadiene, cyclopentadiene, cyclohexadiene, 2,3-dimethylbutadiene, and isoprene with alpha-(p-methoxybenzoyloxy)acrolein catalyzed by the above chiral ammonium salt (2.5-20 mol %) at -20-22 degrees C gave the corresponding adducts with 83, 83, 91, 92, and 88% ee, respectively.
Modular Ligands Derived from Amino Acids for the Enantioselective Addition of Organozinc Reagents to Aldehydes
作者:Meaghan L. Richmond、Christopher T. Seto
DOI:10.1021/jo0349375
日期:2003.9.1
series of modularchiralligands that are derived from aminoacids were prepared and tested for their ability to catalyze the asymmetric addition of alkylzinc reagents to aromatic and aliphatic aldehydes. The ligands contain a tertiary amine, an aminoacid side chain, and a carbamate or amide functional group. One ligand, which was synthesized from Ile, catalyzes the addition of diethylzinc to cyclo
Cytotoxic Activity of Synthetic Chiral Amino Acid Derivatives
作者:Pedro de Castro、Raoni Siqueira、Luiza Conforte、Chris Franco、Gustavo Bressan、Giovanni Amarante
DOI:10.21577/0103-5053.20190157
日期:——
series of dual-protected aminoacidderivatives was synthesized and evaluated as potential novel anticancer agents. The 40 derivatives were prepared in up to three reaction steps. The cytotoxic activities were screened in vitro against a panel of tumor and nontumor cells using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Among the synthesized derivatives, three of them showed
Catalytic enantioselective synthesis of sterically demanding alcohols using di(2°-alkyl)zinc prepared by the refined Charette's method
作者:Manabu Hatano、Tomokazu Mizuno、Kazuaki Ishihara
DOI:10.1039/c0cc01301c
日期:——
A highly practical, catalytic enantioselective 2°-alkyl addition to aldehydes and ketones was developed. Chiral phosphoramide ligand (1) with salt-free and solvent-free di(2°-alkyl)zinc reagents prepared from (2°-alkyl)MgCl was essential.