N-(Diisopropyloxyphosphoryl)amino acids (N-Dipp-amino acids) are prepared from diisopropyl phosphite and amino acids in mixed aqueous media in one step. They can be activated by dicyclohexylcarbodiimide or other activating agents for the synthesis of N-(diisopropyloxyphosphoryl)dipeptides.
The N-phosphorylaminoacids are coupled with chrysin to form phosphorylaminoacids chrysin esters. Five of its new analogs have been synthesized. The structures of all the newly synthesized chrysin derivatives were confirmed by ESI-MS, NMR and IR.
N-磷酰基氨基酸与白杨素偶联形成磷酰基氨基酸白杨素酯。已经合成了五种新的类似物。所有新合成的白杨素衍生物的结构均通过 ESI-MS、NMR 和 IR 确认。
Novel synthesis of steryl esteryl esters from β-sitosterol and <i>N</i>-phosphoryl amino acid under microwave irradiation
GRAPHICAL ABSTRACT ABSTRACT Ten novel N-phosphoryl amino acids β-sitosterol esters were synthesized by coupling the N-phosphoryl amino acids with β-sitosterol undermicrowaveirradiation, and their structures were elucidated by IR, NMR, and HR MS. Various reaction conditions including the catalyst, solvent, temperature and time were investigated. Under the optimal conditions, the reaction was finished in
A novel series of trans-N-phosphoryl amino acid modified resveratrol analogues were synthesized and evaluated in vitro for their cytotoxic effects against CNE-1 and CNE-2 cell lines. These analogues showed good anti-proliferative activity, among which 8d, 8e, 8j, and 9d displayed much stronger inhibition effect than resveratrol and 8d showed the most potent activity with IC(50) value at 3.45 +/- 0.82 mu M. The antitumor effects of 8d, 8e, 8j, and 9d were due to the induction of apoptosis, confirmed by the DNA fragmentation and flow cytometry analysis using PI (propidium iodide) staining and Annexin-V-FITC/PI staining assay. The PI staining assay also showed that 8d, 8e, 8j, and 9d caused cell cycles arrest at G(0)-G(1) phase which finally led to cell apoptosis. Further mechanism study on compound 8d against CNE-2 cells has shown the PARP cleavage, which is a hallmark of caspase-3 activation, as well as the activation of caspase-9, and the intracellular ROS generation. These results all suggest that 8d induced a mitochondrial-dependent apoptosis pathway. (c) 2008 Elsevier Ltd. All rights reserved.