1-Arylimino-pyrazol-Betaine, Pyrazole und 1,2,4-Triazine aus 3-Arylazo-propens�ure-N-chloroamiden
摘要:
Reaction of 3-arylazo-propenoic acid amides 5 with NaOCl yields N-chloroamides 6 which give under alkaline conditions 1,2,4-triazines 9 and 10 (products of a Hofmann degradation). This reaction competes with an intramolecular electrophilic amination and a 1,2-shift reaction giving I-arylimino-pyrazole betaines 11 and 4-chloroimino-pyrazolones 13. Exchange of the halogen in 11 with nucleophiles leads to further betaines 12. Bis-pyrazole 14 and 1,2,3-triazoles 15 are available from 13b. The X-ray structure analysis of compound 11b is discussed.
[EN] N-[(SUBSTITUTED FIVE-MEMBERED DI- OR TRIAZA DIUNSATURATED RING)CARBONYL] GUANIDINE DERIVATIVES FOR THE TREATMENT OF ISCHEMIA<br/>[FR] DERIVES DE LA N-[(A CYCLE DI OU TRIAZA DIINSATURE SUBSTITUE) CARBONYLE] GUANIDINE UTILISES POUR LE TRAITEMENT DE L'ISCHEMIE
申请人:PFIZER PRODUCTS INC.
公开号:WO1999043663A1
公开(公告)日:1999-09-02
(EN) NHE-1 inhibitors, methods of using such NHE-1 inhibitors and pharmaceutical compositions containing such NHE-1 inhibitors. The NHE-1 inhibitors are useful for the reduction of tissue damage resulting from tissue ischemia.(FR) L'invention porte sur des inhibiteurs du NHE-1, sur leurs procédés d'utilisation, et sur des préparations pharmaceutiques les contenant. Lesdits inhibiteurs servent à réduire les dommages tissulaires résultant de l'ischémie des tissus.
N-[(substituted five-membered di-or triaza diunsaturated ring)carbonyl] guanidine derivatives for the treatment of ischemia
申请人:Pfizer Inc.
公开号:US20030149043A1
公开(公告)日:2003-08-07
NHE-1 inhibitors, methods of using such NHE-1 inhibitors and pharmaceutical compositions containing such NHE-1 inhibitors. The NHE-1 inhibitors are useful for the reduction of tissue damage resulting from tissue ischemia.
Synthesis of 2H-1,2,3-triazole-4-carboxylic acids via Ru(II)-catalyzed rearrangement of 4-hydrazonoisoxazol-5-ones
作者:Dmitrii S. Vasilchenko、Anastasiya V. Agafonova、Ivan V. Simdianov、Alexander N. Koronatov、Pavel A. Sakharov、Ilya A. Romanenko、Nikolai V. Rostovskii、Alexander F. Khlebnikov、Mikhail S. Novikov
DOI:10.1016/j.tetlet.2023.154580
日期:2023.6
An atom-economy, two-step synthesis of 2H-1,2,3-triazole-4-carboxylic acids from 3-arylisoxazol-5(4H)-ones and arenediazonium tetrafluoroborates is described. The formation of the 1,2,3-triazole ring is achieved by the [Ru(p-cymene)Cl2]2-catalyzed rearrangement of 4-hydrazonoisoxazol-5-ones which are resulted from the diazo coupling. The advantages of the method include the available starting compounds
描述了从 3-芳基异恶唑-5(4 H )-酮和芳烃重氮四氟硼酸盐两步原子经济合成 2 H -1,2,3-三唑-4-羧酸。1,2,3-三唑环的形成是通过重氮偶联产生的4-亚肼基异恶唑-5-酮的[Ru( p-伞花烃)Cl 2 ] 2催化重排来实现的。该方法的优点包括可用的起始化合物以及无需使用色谱法即可纯化目标酸的能力。
Singh, Shyam K.; Summers, Lindsay A., Journal of Heterocyclic Chemistry, 1987, vol. 24, p. 933 - 939