81945-59-7Relevant academic research and scientific papers
An azide and acetylene free synthesis of 1-substituted 1,2,3-triazoles
Patterson, Sarah J.M.,Clark, Peter R.,Williams, Glynn D.,Tomkinson, Nicholas C.O.
, (2020)
This paper details a simple and efficient 3-component synthesis of 1-substituted 1,2,3-triazoles using a primary amine, 2,2-dimethoxyacetaldehyde and tosylhydrazide. The reaction proceeds in good to excellent yields using either aliphatic or aromatic amine substrates and is tolerant of a wide range of functional groups including electron-rich and deficient aryl groups, terminal alkynes, ketones and highly sterically encumbered amines.
[4 + 1] Annulation of in situ generated azoalkenes with amines: A powerful approach to access 1-substituted 1,2,3-triazoles
Bi, Xihe,Ning, Yongquan,Sivaguru, Paramasivam,Wang, Hongwei,Zanoni, Giuseppe
supporting information, (2021/09/30)
1-Substituted 1,2,3-triazoles represents ‘privileged’ structural scaffolds of many clinical pharmaceuticals. However, the traditional methods for their preparation mainly rely on thermal [3 + 2] cycloaddition of potentially dangerous acetylene and azides. Here we report a base-mediated [4 + 1] annulation of azoalkenes generated in situ from readily available difluoroacetaldehyde N-tosylhydrazones (DFHZ-Ts) with amines under relatively mild conditions. This azide- and acetylene-free strategy provides facile access to diverse 1-substituted 1,2,3-triazole derivatives in high yield in a regiospecific manner. This transformation has great functional group tolerance and can suit a broad substrate scope. Furthermore, the application of this novel methodology in the gram-scale synthesis of an antibiotic drug PH-027 and in the late-stage derivatization of several bioactive small molecules and clinical drugs demonstrated its generality, practicability and applicability.
Microwave irradiation as an effective means of synthesizing uninfstituted N-linked 1,2,3-triazoles from vinyl acetate and azides
Hansen, Signe Grann,Jensen, Henrik Helligs?
experimental part, p. 3275 - 3278 (2010/03/03)
N-Linked 1,2,3-triazoles have been prepared by a reaction of azides with vinyl acetate under microwave irradiation. Additionally, a microwave-assisted, two-step, one-pot procedure from halides involving azideinfstitution in diethyl ether, followed by -reaction with vinyl acetate, has effectively been employed. Georg Thieme Verlag Stuttgart - New York.
