Preparation of 1,5-Disubstituted Tetrazoles Under Phase-Transfer Conditions
作者:T. V. Artamonova、A. B. Zhivich、M. Yu. Dubinskii、G. I. Koldobskii
DOI:10.1055/s-1996-4418
日期:1996.12
Imidoyl chlorides, obtained by common methods from a wide range of aromatic mono- and diamides, are smoothly converted to the corresponding tetrazoles in high yields by treatment with NaN3 under phase-transfer conditions.
The present invention relates to a method of deprotecting a tetrazole compound, useful as an intermediate for angiotensin II receptor blockers, and provides a novel production method of angiotensin II receptor blockers.
Provided is a production method of a compound represented by the formula [3] or [4] or a salt thereof, including (i) reducing a compound represented by the formula [1] or [2] or a salt thereof in the presence of a metal catalyst and an alkaline earth metal salt, or (ii) reacting the compound with a particular amount of Brønsted acid:
wherein each symbol is as defined in the present specification.
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
1,(3,)5-SUBSTITUTED IMIDAZOLES, THEIR USE IN THE TREATMENT OF HYPERTENSION AND METHODS FOR THEIR PREPARATION
申请人:Matsoukas John
公开号:US20100166837A1
公开(公告)日:2010-07-01
The present invention provides novel 1,5 and 1,3,5-substituted imidazole compounds in hydrophilic or lipophilic form, which are useful as angiotensin II ATI receptor antagonists suitable for transdermal delivery. The invention also provides pharmaceutical compositions containing such compounds, processes and intermediates for preparing compounds and their use in methods of treating hypertension and cardiovascular diseases.
the basis of the availability of the archetypical starting materials, this method provided very versatile synthetic access to 1,5-disubstituted tetrazoles. The usefulness of this method was demonstrated in the synthesis of biologically important fused tetrazole scaffolds and the marketed drug cilostazol.