Synthesis of β-lactam peptidomimetics through Ugi MCR: first application of chiral Nβ-Fmoc amino alkyl isonitriles in MCRs
摘要:
Chiral N-beta-Fmoc amino alkyl isonitriles were employed in Ugi multi component reactions (Ugi 4C-3CR) to obtain functionalized beta-lactam peptidomimetics with L-aspartic acid alpha-methyl ester/peptide ester and organic aldehydes. The reactions were carried out in MeOH. Thirteen Ugi products have been prepared in good to moderate yields with good diastereoselectivities. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis of novel glycopeptidomimetics via Nβ-protected-amino alkyl isonitrile based Ugi 4C reaction
作者:Basavalingappa Vasantha、Girish Prabhu、Hosmani Basavaprabhu、Vommina V. Sureshbabu
DOI:10.1016/j.tetlet.2013.06.013
日期:2013.8
The Ugi-4C reaction employing Nβ-protected-amino alkyl isonitrile, amino acid ester, aldehyde, and glycosyl acid has resulted in novel glycosylated peptidomimetics. The extension of MCR products for the synthesis of N,N′-orthogonally protected glycosylated peptidomimetics has also been demonstrated.
Chiral Nβ-Fmoc-amino alkyl isonitriles in Ugi-4CR: an assembly of novel 1,1′-iminodicarboxylated peptidomimetics
作者:N. Narendra、T.M. Vishwanatha、G. Nagendra、Vommina V. Sureshbabu
DOI:10.1016/j.tet.2011.12.037
日期:2012.2
Enantiopure N-beta-Fmoc-amino alkyl isonitriles and amino acid esters have been employed as building blocks in Ugi four-component reaction (U-4CR) to yield 1,1 '-iminodicarboxylated peptidomimetics. By employing trifluoroacetic acid as one of the components, a different outcome has been observed and rationalized. Ugi products are obtained as trifluoroacetamide adducts, which on further reaction under mild acidic conditions lead to the title compounds. The method has also been proven to be useful for the preparation of ethyl, benzyl and tert-butyl esters. (C) 2011 Elsevier Ltd. All rights reserved.