COCHO-modified oxides nanoparticles by using phosphonic acid as grafting agent
摘要:
The synthesis of phosphonic acid 4 possessing a protected COCHO group, by using the Heck reaction is described. After grafting of the phosphonic acid 4 on metal oxides Al2O3, TiO2 or SnO2, the cleavage of the dithiane group was successful. The reactivity of the supported-COCHO group was examined by using model reactions with hydroxylamine and hydrazine derivatives. (C) 2003 Elsevier Ltd. All rights reserved.
Synthesis of N-glyoxylyl peptides and their in vitro evaluation as HIV-1 protease inhibitors
摘要:
A series of novel synthetic peptides containing an N-terminal glyoxylyl function (CHOCO-) have been tested as inhibitors of HIV-1 protease. The N-glyoxylyl peptide CHOCO-Pro-Ile-Val-NH2, which fulfills the specificity requirements of the MA/CA protease cleavage site together with the criteria of transition state analogue of the catalyzed reaction, was found to be a moderate competitive inhibitor although favorable interactions were visualized between its hydrated form and the catalytic aspartates using molecular modeling. Increasing the length of the peptide sequence led to compounds acting only as substrates. (C) 1997 Elsevier Science Ltd.
The synthesis and characterisation of α-oxo aldehyde-supportedsilicas by the sol-gel procedure is described. The glyoxylyl group was generated after gelation, either by periodic oxidation of gluconamide chains or by deprotection of a diisopropylthioacetal-protected derivative. The accessibility and reactivity of the supported α-oxo aldehyde function was investigated in model reactions with hydroxylamine