Catalytic asymmetric synthesis of β-triazolyl amino alcohols by asymmetric transfer hydrogenation of α-triazolyl amino alkanones
摘要:
The synthesis of optically active beta-triazolyl amino alcohols was carried out via ruthenium catalyzed asymmetric transfer hydrogenation of alpha-triazolyl amino alkanones. This reaction proceeds under mild reaction conditions with up to 99% yield and 99.9% enantiomeric excess (ee). This protocol was applied to the synthesis of an enantiopure antitubercular agent and its arylated product with retention in enantiomeric purity. The absolute configuration at the stereogenic center of the chiral product as found to be (S). (C) 2017 Elsevier Ltd. All rights reserved.
Copper(II) complex of 1,2-bis(4-pyridylthio)ethane immobilized on polystyrene was a used as a highly stable, active, reusable and green catalyst for click synthesis of 1,2,3-triazoles via one-pot three-component reaction of organic halides, sodium azide and alkynes. The catalyst was characterized by FT-IR spectroscopy, thermogravimetric analysis, elemental analysis, field emission scanning electron
Copper Immobilized on Nanosilica Triazine Dendrimer (Cu(II)-TD@nSiO<sub>2</sub>)-Catalyzed Regioselective Synthesis of 1,4-Disubstituted 1,2,3-Triazoles and Bis- and Tris-Triazoles via a One-Pot Multicomponent Click Reaction
作者:Mahboobeh Nasr-Esfahani、Iraj Mohammadpoor-Baltork、Ahmad R. Khosropour、Majid Moghadam、Valiollah Mirkhani、Shahram Tangestaninejad、Hadi Amiri Rudbari
DOI:10.1021/jo402170n
日期:2014.2.7
An efficient, atom-economical, and regioselective synthesis of a wide range of 1,4-disubstituted 1,2,3-triazoles in excellent yields has been achieved via a one-pot three-component reaction of alkynes and sodium azide with organic halides or alpha-bromo ketones catalyzed by Cu(II)-TD@ nSiO(2)/sodium ascorbate at room temperature. This catalytic system also showed excellent activity in the synthesis of bis- and tris-1,4-substituted 1,2,3-triazoles. Moreover, the catalyst could be recycled and reused for seven cycles without any loss in its catalytic activity.