An Efficient and Epimerization Free Synthesis of C-Terminal Arylamides Derived from α-Amino Acids and Peptide Acids via T3P Activation
作者:Chilakapati Madhu、Panguluri NageswaraRao、N. Narendra、Vommina V. Sureshbabu
DOI:10.1007/s10989-013-9383-7
日期:2014.9
A high yield and rapid synthesis of enantiomerically pure N α-protected amino/peptideacid arylamides using n-propylphosphonic anhydride (T3P) in presence of N-methylmorpholine is described. The generality of the reaction has been studied for various N α-protected amino acids with diverse range of aromatic amines and coumarin derivatives.
A Convenient Synthesis of Amino Acid Arylamides Utilizing Methanesulfonyl Chloride and N-Methylimidazole
作者:Weicheng Zhou、Liguang Mao、Zhenyu Wang、Yongjia Li、Xiqian Han
DOI:10.1055/s-0030-1259099
日期:2011.1
N-Cbz-protected amino acids reacted with various arylamines in the presence of methanesulfonyl chloride and N-methylimidazole in dichloromethane to give the corresponding arylamides in high yields. No obvious racemization was observed under the mild conditions.
Enantioselective nickel-catalyzed conjugate addition of dialkylzinc to chalcones using chiral α-amino amides
作者:Jorge Escorihuela、M. Isabel Burguete、Santiago V. Luis
DOI:10.1016/j.tetlet.2008.09.120
日期:2008.11
A series of alpha-amino amides derived from natural amino acids (alanine, valine, phenylalanine, isoleucine, and phenylglycine) have been synthesized and fully characterized. Their Ni(II) complexes prepared from Ni(acac)(2) catalyze the enantioselective conjugate addition of diethylzinc to chalcones in high yields and in good enantioselectivities (up to 84%). The side chain of the amino acid and the substituents in the amide nitrogen govern the enantioselectivity of the catalytic process. (c) 2008 Elsevier Ltd. All rights reserved.
Non-phosgene route to unsymmetrical ureas from N-Cbz-α-amino acid amides
作者:Ebrahim H. Ghazvini Zadeh、Nader E. Abo-Dya、Ania C. Sotuyo、Ion Ghiviriga、C. Dennis Hall
DOI:10.1016/j.tetlet.2013.07.141
日期:2013.10
A convenient method toward the synthesis of α-amino acid-derived unsymmetrical ureas 2 is described herein. This route involves an interesting rearrangement of amides of N-Cbz-α-amino acids 1, which presumably entails the intermediacy of hydantoins that is followed by hydrolysis to afford unsymmetrical ureas 2 in quantitative yields and high purity.