Concise total synthesis of the prolyl endopeptidase inhibitor eurystatin A via a novel Passerini reaction–deprotection–acyl migration strategy
摘要:
The Passerini reaction between suitably protected alaninal, leucine isonitrile, and ornithine components delivered adducts 10a,b in high yield. Orthogonal N-deprotection of 10a led, via a smooth O- to N-acyl migration, to 11, which constitutes the entire skeleton of the eurystatins. Subsequent deprotection, macrocyclization, elaboration, and final oxidation steps efficiently afforded eurystatin A 1a in high overall yield. (C) 2001 Elsevier Science Ltd. All rights reserved.
Isoselenocyanates derived from amino acid esters: an expedient synthesis and application to the assembly of selenoureidopeptidomimetics, unsymmetrical Selenoureas and selenohydantoins
作者:Hosahalli P. Hemantha、Vommina V. Sureshbabu
DOI:10.1002/psc.1276
日期:2010.11
all the isoselenocyanates havebeen isolated as stable ones after chromatographic purification. These hitherto unreported classes of molecules would be useful building blocks for the preparation of variety of selenium containing peptidomimetics. In this study, the utility of the title molecules in the preparation of selenoureidopeptidomimetics 6, unsymmetrical selenoureas 8 and selenohydantoins 10 isdemonstrated