One-pot synthesis of orthogonally protected dipeptide selenazoles employing Nα-amino selenocarboxamides and α-bromomethyl ketones
作者:Chilakapati Madhu、Nageswara Rao Panguluri、N. Narendra、V. Panduranga、Vommina V. Sureshbabu
DOI:10.1016/j.tetlet.2014.10.085
日期:2014.12
A simple and efficient protocol for the synthesis of selenazole containing dipeptidomimetics using N-alpha-amino selenocarboxamides and alpha-bromomethyl ketones is described. All the compounds made were isolated in good yields and fully characterized. (C) 2014 Elsevier Ltd. All rights reserved.
Synthesis of N-Urethane Protected α-Aminoalkyl-α′-cyanomethyl Ketones; Application to the Synthesis of 3-Substituted 5-Amino-1H-pyrazole Tethered Peptidomimetics
作者:Vommina Sureshbabu、M. Sharnabai、G. Nagendra
DOI:10.1055/s-0032-1316586
日期:2012.8
The preparation of N-protected amino/peptide alpha-cyanomethyl ketones through cyanation of the corresponding alpha-bromomethyl ketones is described. The utility of the resulting acyanomethyl ketones in the synthesis of 3-substituted-5-amino-1H-pyrazoles has also been demonstrated. In both steps a wide range of N-protected amino/peptide acids has been employed and the products are obtained in good yield. The enantiomeric purity of both the alpha-cyanomethyl ketones and pyrazoles were confirmed by chiral HPLC analysis of the corresponding Z-protected D-and L-Ala-OH as model substrates. The synthesis of peptide pyrazolecarbox-amides is also delineated.
Stereoselective Synthesis of Erythro α-Amino Epoxides