Synthesis of epoxy and aziridino malonyl peptidomimetics
摘要:
Short malonyl dehydro peptides have been epoxidized using H2O2/Na2WO4 dihydrate. The obtained diastereomeric epoxides were separated by HPLC and successfully tested in the ring opening reaction with N-Boc L-cysteine methyl ester, to indicate their electrophilic behavior. Moreover, by a simple two-step reaction, the epoxy malonyl peptides can be converted into the corresponding aziridino malonyl peptides. (C) 2010 Elsevier Ltd. All rights reserved.
Short malonyl dehydro peptides as potential scaffolds for peptidomimetics by an efficient Knoevenagel reaction
摘要:
Non-symmetric disubstituted malonamides rAA-mGly-AA', obtained from Meldrum's acid, were considered as methylene active compounds and a Knoevenagel condensation methodology was developed involving piperidine and activated 4 molecular sieves as catalysts. The reaction is efficient, broad in scope, and easy to perform and allows access to E/Z mixtures of short malonyl dehydro peptides (MDHPs) rAA-m Delta(2)AAaEuro(3)-AA', partially modified retro peptides characterized by an interesting combination of retro and dehydro modifications in the same structure.