Synthesis, Cytotoxic and Antimicrobial Screening of a Proline-Rich Cyclopolypeptide
作者:Rajiv Dahiya、Akhilesh Kumar、Rajul Gupta
DOI:10.1248/cpb.57.214
日期:——
Present study describes the first total synthesis of a cyclic heptapeptide, stylisin 1 (8) via coupling of tetrapeptide Boc-L-tyrosinyl-L-prolyl-L-leucyl-L-proline-OH and tripeptide L-phenylalanyl-L-isoleucyl-L-proline-OMe followed by cyclization of linear heptapeptide segment. Structure elucidation of synthesized cyclopeptide was done on basis of detailed spectral as well as elemental analysis. From the results of pharmacological screening, it was concluded that cyclopeptide 8 possessed moderate cytotoxicity against Dalton's lymphoma ascites (DLA) and Ehrlich's ascites carcinoma (EAC) cell lines with IC50 (inhibitory concentration, 50%) values of 10.6 and 14.6 μM. Furthermore, cyclopeptide 8 exhibited moderate to good antimicrobial activity against Gram −ve (negative) bacteria Klebsiella pneumoniae and Pseudomonas aeruginosa, dermatophytes and Candida albicans with minimum inhibitory concentration (MIC) of 6 μg/ml.
Enantioselective Henry reaction catalyzed by C2-symmetric chiral diamine–copper(II) complex
作者:Sermadurai Selvakumar、Dhanasekaran Sivasankaran、Vinod K. Singh
DOI:10.1039/b904254g
日期:——
A copper(II) complex of C2-symmetric diamine has been proved to be an efficient catalyst for the enantioselective Henry reaction between nitroalkanes and various aldehydes to provide β-hydroxy nitroalkanes in high yields (up to 97%), moderate diastereoselectivities (up to 71:29) and excellent enantiomeric excesses (up to 96%). The chiral nitroaldol adduct obtained has been further converted into chiral
Towards the First Total Synthesis and Anticancer Screening of Polycarponin C: A Cyclic Octapeptide
作者:Nirmala Shinde、Avinash Dhake、Kishan Haval
DOI:10.13005/ojc/320159
日期:2016.3.25
The present study describes designing, synthesis and anticancer screening of a proline rich cyclic octapeptide polycarponin C, by solution phase synthesis. The synthesis was carried out by coupling a tetrapeptide Boc-Pro-Thr-Leu-Pro-OH with another tetrapeptide Boc-Pro-Val-Leu-PheOH, followed by cyclization of the linear octapeptide.The structure of the synthesized compound was then confirmed by spectral
A novel compound that exhibits inhibitory activity against prolyl endopeptidase and a method for chemical synthesis of said compound, as well as its use as a prolyl endopeptidase inhibitor and an anti-amnesic agent that contains said compound as the active ingredient are provided.
Organophotocatalytic Carbamoylation of Morita‐Baylis‐Hillman Carbonates
作者:Lucas Marchini、Jeimy A. C. Vélez、Elias Andre、Jose Tiago M. Correia、Sidnei Moura、Márcio W. Paixão
DOI:10.1002/adsc.202301419
日期:2024.5.21
amide functionality play a significant role in the development of pharmaceuticals and biologically active compounds. While conventional amidation strategies primarily relies on C‐N bond formation, the strategic integration of photoredoxcatalysis for synthesizing these compounds through C‐C bond formation is in accordance with the principles of green chemistry and sustainability. Herein, we demonstrate