Copper nanoparticles: A capable and versatile catalyst for the synthesis of diverse 1-phenyl-1H-tetrazoles from amino acids
摘要:
Cu nanoparticles were prepared in successive stages: preparation of the Fe3O4 magnetic nanoparticles (Fe3O4 MNPs), coating of the Fe3O4 MNPs with tetraethyl orthosilicate (Fe3O4@SiO2), functionalization of Fe3O4@SiO2 with 3-chloropropyltrimethoxysilane (CPTMS) and 4-amino-1,2,4-triazole (AT) ligands (Fe3O4@SiO2@CPTMS@AT), and the complexation of Fe3O4@SiO2@CPTMS@AT with CuCl2 (Fe3O4@SiO2@CPTMS@AT@Cu). The obtained Cu nano-catalyst was then used for the synthesis of diverse tetrazoles from the reaction of various amino acids with sodium azide and triethyl orthoformate (TEOF) in ethanol at 80 degrees C. (C) 2018 Elsevier Ltd. All rights reserved.
Enantioselectivity of the reaction of α-amino acids with sodium azide and triethyl orthoformate in the synthesis of tetrazoles
作者:S. S. Chuprun、A. V. Protas、O. S. Fedorova、D. D. Vaulina、R. N. Krasikova、E. A. Popova、R. E. Trifonov
DOI:10.1134/s1070428016120307
日期:2016.12
enantioselectivity of such reactions remains unresolved. In this work we used enantiomericallypure Land D-amino acids and their benzyl esters 1a–1g to synthesize the corresponding 2-(1H-tetrazol-1-yl)acetic acids 2a–2g. The substrates were aminoacids of different natures, including aliphatic and aromatic aminoacids, amino dicarboxylic acid benzyl esters, and those containing an ester group in the side chain
Cu nanoparticles were prepared in successive stages: preparation of the Fe3O4 magnetic nanoparticles (Fe3O4 MNPs), coating of the Fe3O4 MNPs with tetraethyl orthosilicate (Fe3O4@SiO2), functionalization of Fe3O4@SiO2 with 3-chloropropyltrimethoxysilane (CPTMS) and 4-amino-1,2,4-triazole (AT) ligands (Fe3O4@SiO2@CPTMS@AT), and the complexation of Fe3O4@SiO2@CPTMS@AT with CuCl2 (Fe3O4@SiO2@CPTMS@AT@Cu). The obtained Cu nano-catalyst was then used for the synthesis of diverse tetrazoles from the reaction of various amino acids with sodium azide and triethyl orthoformate (TEOF) in ethanol at 80 degrees C. (C) 2018 Elsevier Ltd. All rights reserved.