[EN] PROCESS FOR THE PREPARATION OF N-HYDROXY-1-(1-ALKYL-1H-TETRAZOL-5-YL)-1-PHENYLMETHANIMINE DERIVATIVES [FR] PROCÉDÉ POUR LA PRÉPARATION DE DÉRIVÉS DE N-HYDROXY-1-(1-ALKYL-1H-TÉTRAZOL-5-YL)-1-PHÉNYLMÉTHANIMINE
A novel method was developed for the synthesis of tetrazoles from amides utilizing diphenyl phosphorazidate or bis(p-nitrophenyl) phosphorazidate as both the activator of amide–oxygen for elimination and azide source. Various amides were converted into the corresponding tetrazoles in good yields. This synthetic method allows to prepare 1,5-disubstituted and 5-substituted 1H-tetrazoles from various
Improved conditions for converting sterically hindered amides to 1,5-disubstituted tetrazoles
作者:Gretchen M. Schroeder、Sydney Marshall、Honghe Wan、Ashok V. Purandare
DOI:10.1016/j.tetlet.2010.01.024
日期:2010.3
Improved conditions for converting amides into 1,5-disubstituted tetrazoles are described. The optimum reaction conditions [diisopropyl azodicarboxylate (DIAD), diphenylphosphoryl azide (DPPA), and diphenyl-2-pyridyl phosphine in THF at 45 °C] converted stericallyhinderedamides to their corresponding tetrazoles in good yield.
ADDITION REACTION OF TRIMETHYLSILYL AZIDE TOWARDS KETONES AND FACILE FORMATION OF TETRAZOLE DERIVATIVES
作者:Kozaburo Nishiyama、Akio Watanabe
DOI:10.1246/cl.1984.455
日期:1984.3.5
In the presence of Lewis acid such as SnCl2, the reactions of trimethylsilylazide with ketones readily gave 1:1- or 1:2-adduct, which reacted with Lewis acid to afford tetrazole.
An environmentallyfriendlymethod was established for the N‐methylation of the 5‐substituted 1H‐tetrazoles with a greenreagent: DMC. DABCO was the optimal catalyst, and hazardous chemicals were avoided in this protocol. A plausible catalytic mechanism is proposed, which consists of a DABCO‐activated process and a thermally induced rearrangement of tetrazole carbamates.
Process for the preparation of N-hydroxy-1-(1-alkyl-1H-tetrazol-5-yl)-1-phenylmethanimine derivatives
申请人:Coqueron Pierre-Yves
公开号:US09212152B2
公开(公告)日:2015-12-15
The present invention relates to a process for the preparation of N-hydroxy-1-(1-alkyl-1H-tetrazol-5-yl)-1-phenylmethanimine derivatives of the general formula (I)