3-(3-吡啶基)-4-氨基-5-芳胺基-1,2,4-三唑的合成与表征

以烟酸与芳胺为基本原料，经多步反应，制得1－烟酰基－4－芳基氨基硫脲；后者在水合肼存在下关环，合成了一系列新化合物3－（3－吡啶基）－4－氨基－5－芳胺基－1，2，4－三唑。化合物结构经元素分析、IR，^1H NMR,^13C NMR确证。     

Darstellung von 3-Amino-4-nitro-5-methylisoxazol aus 3-Amino-5-methylisoxazol

Zusammenfassung 3-Amino-5-methylisoxazol wird mit Bernsteinsäureanhydrid in 3-Succinimido-5-methylisoxazol übergeführt, welches sich mit Oleum und rauch. HNO₃ nitrieren läßt. Die Abnahme der Schutzgruppe zu 3-Amino-4-nitro-5-methylisoxazol erfolgt mit alkohol. HCl.

---

Preparation of 3-amino-4-nitro-5-methylisoxazole from 3-amino-5-methylisoxazole

3-Amino-5-methylisoxazole is converted to 3-succinimido-5-methylisoxazole with succinic anhydride. The product can be nitrated with oleum and fuming HNO₃. Removal of the protective group yielding 3-amino-4-nitro-5-methylisoxazole is effected with alcoholic HCl.

     

Darstellung von Derivaten des Trimethoxybenzols

Zusammenfassung Es wird die Darstellung von 6,7,8-Trimethoxy-3-amino-chinazolonen-(4) durch Umsetzung der 2-Acylamino-3,4,5-trimethoxybenzoesäureester mit Hydrazinhydrat beschrieben.Außerdem berichten wir über die Halomethylierungsprodukte des Trimethoxybenzols und deren Verwendung zur Synthese neuer Verbindungen.     

Darstellung von 2-substituierten 3-Amino-6,7-methylendioxychinazolonen-(4)

Zusammenfassung 6-Amino-3,4-methylendioxybenzoesäure-methylester wird mit aliphatischen, aromatischen und heterocyclischen Säurechloriden umgesetzt; die entstehenden Acylaminoverbindungen werden durch Behandeln mit Hydrazinhydrat in die entsprechenden Aminochinazolone übergeführt.     

3-(4-吡啶基)-4-(6-取代色酮-3-基-亚甲氨基)-5-芳氨基-1,2,4-三唑的合成

N-芳基-N'-[(4-吡啶基)羰基]氨基硫脲用85%的水合肼环化, 得到3-(4-吡啶基)-4-氨基-5-芳氨基-1,2,4-三唑(2a～2c). 然后再与3-甲酰基色酮(3a～3d)反应, 制备得到了一系列新化合物: 3-(4-吡啶基)-4-(6-取代色酮-3-基亚甲氨基)-5-芳氨基-1,2,4-三唑(4a～4c, 5a～5c, 6a～6c, 7a～7c). 化合物的结构经元素分析, IR, ¹H NMR和MS确证.     

Improved syntheses of 5-substituted-4-amino-3-mercapto-(4H)-1,2,4-triazoles

Two improved methods have been developed for the synthesis of 5-substiluted-4-amino-3-mercapto-(4H)-1,2,4-triazoles. One of these involves the direct hydrazinolysis of potassium 3-aroyldithiocarbazates and the other involves ring-opening and reclosure of 5-substituted-2-mereapto-1,3,4-oxadiazoles to the aminomercaptotriazoles. Both of these methods offer advantages over the classic Hoggarth synthesis.     

4-Amino-3-（p-chlorophenyl）-5-（p-methoxybenzyl）-4H-1,2,4-triazole：X-ray and DFT-calculated Structures

The title compound, 4-amino-3-(p-chlorophenyl)-5-(p-methoxybenzyl)-4H-1,2,4- triazole I , C16H15ClN4O), has been determined using X-ray diffraction techniques and the molecular structure has also been optimized at the B3LYP/6-31 G(d, p) level using density functional theory (DFT). The triazole ring exhibits dihedral angles of 41.61(15)o and 80.73(11)o with the phenyl rings. The molecules are linked principally by N–H…N hydrogen bonds involving the amino NH2 group and a triazole N atom, forming C(5) chains which are further linked to give a two-dimensional network of molecules. The N–H…N hydrogen bonding is supported by C–H…N hydrogen bond and C–H…π interaction. Intermolecular N–H…N and C–H…N hydrogen bonds produce R22(9), R44(10) and R44(20) rings.     

Synthesis of 2-amino-5-(5R-1,2,4-oxadiazolyl-3)-1,3,4-oxadiazoles

The interaction of 2-amino-1,3,4-oxadiazole-5-carboxamidoxime with nitriles in the presence of ZnCl₂ and HCl or with trichloroacetic anhydride affords 2-amino-5-(5R-1,2,4-oxadiazolyl-3)-1,3,4-oxadiazoles. Their reactions with N-nucleophiles have been studied.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2100–2103, December, 1993.     

Bestimmung von 3-Amino-1,2,4-triazoI (3-AT) in Pflanzenmaterial

Ohne Zusammenfassung     

Synthesis and Crystal Structure of 3,（5-Amino-4-ethoxycarbonyl-3-methylthio-1-H- pyrazolyl）-5-phenyl-1,2,4-triazine

1 INTRODUCTION Substituted 1,2,4-triazines represent an important class of nitrogen-containing heterocycles. The 1,2, 4-triazine core is a versatile synthetic platform to access a wide range of condensed heterocyclic ring systems via intramolecular Diels-Alder reactions with a vast array of dienophiles[1~5]. In addition, 1,2, 4-triazines have been associated with diverse activi- ties such as antihypertension and inhibition of pla- telets[6] and antiinflammatory[7], and been a key com- po…     

Complexing reactions in the Ni(II)-5-methyl-4-amino-3-thiooxo-1,2,4-triazapentene-1-methanal and Ni(II)-5-methyl-4-amino- 3-thiooxo-1,2,4-triazapentene-1-propanone triple systems

Complexing processes in the Ni^II-TTA-methanal (A) and Ni^II-TTA-propanone (B) triple systems (TTA–5-methyl-4-amino-3-thiooxo-1, 2, 4-triazapentene-1) in ethanol solution and nickel(II)hexacyanoferrate(II) gelatin-immobilized matrix have been studied. In the Ni^II-TTA- methanal system, formation of Ni^II oligomeric coordination compounds in which metal chelate cycles are connected by–H₂C–O–CH₂–structural groups, takes place. In the Ni^II-TTA-propanone triple system, formation of only Ni^II complexes with TTA takes place. No complexing process in the triple systems in nickel(II)hexacyanoferrate(II) gelatin-immobilized matrix was found.     

Synthese von 3-(2-Carboxy-4-Pyridyl)- und 3-(6-Carboxy-3-pyridyl)-DL-alanin

Synthesis of 3-(2-Carboxy-4-pyridyl)-and 3-(6-Carboxy-3-pyridyl)-DL-alanine As starting materials for potential photochemical approaches to betalaines C(R = COOH) and to muscaflavine F(R = COOH), β-(2-carboxy-4-pyridyl)- and β-(6(carboxy-3-pyridyl))-DL-alanine ( A and D with R = COOH or 4 and 11 ), respectively, were prepared (Scheme 1). The synthesis of 4 (= A, R = COOH) started with the 2-[(4-pyridyl)methyl]malonate 1 and proceeded via the N-oxide 2 , cyanation and hydrolysis (Scheme 2). Amino acid 11 was obtained from (3-pyridyl)methyl-bromide ( 6 ) via the malonate 7 by an analogous sequence of reactions (Scheme 3).     

Darstellung und Reaktionen von 5-Amino-2H-imidazolen

Zusammenfassung 2,4,5-substituierte 5-Amino-2H-imidazole entstehen mit guten Ausbeuten durch Behandlung einer Lösung der entsprechenden Imidazolin-³-thione-(5) in Äthylenglykol mit NH₃ bei 80°.Die Reaktionsfähigkeit der neuen Verbindungen wird am Beispiel des 2-Methyl-2,4-diphenyl-5-amino-2H-imidazols untersucht. Bei der Acetylierung, Benzoylierung sowie der Umsetzung mit Benzolsulfochlorid, Phenylisocyanat und Phenylsenföl reagiert die exocyclische Aminogruppe; die Alkylierung mit CH₃J erfolgt dagegen am Ringstickstoff. Die Umsetzung mit Acetessigester oder Malonsäurediäthylester führt zum neuen bicyclischen System der 5H-Imidazo[1,5-a]pyrimidinone. Durch Reduktion mit NaBH₄-AlCl₃ entsteht mit geringer Ausbeute das entsprechende 5-Amino-imidazolidin.

---

2,4,5-substituted 5-amino-2H-imidazoles are formed in good yields, when a solution of the corresponding ³-imidazoline-5-thione in ethylene glycol is treated with NH₃ at 80°.The reactivity of this new class of compounds has been investigated using 2-methyl-2,4-diphenyl-5-amino-2H-imidazole. On acetylation, benzoylation and in the reaction with benzenesulfonyl chloride, phenyl isocyanate and phenyl isothiocyanate, the exocyclic amino group reacts; alkylation with CH₃J, however, takes place at the ring nitrogen atom. The reaction with ethyl acetoacetate or ethyl malonate leads to the new bicyclic ring system of 5H-imidazo-[1,5-a]-pyrimidinones. Reduction with NaBH₄-AlCl₃ gives in lower yields the corresponding 5-amino-imidazolidine.

---

---

45. Mitt.:F. Asinger, W. Schäfer undG. Kriebel, Mh. Chem.96, 69 (1965).

---

Teil der Dissertation vonA. V. Grenacher, Techn. Hochschule Aachen. 1964.     

Synthesis of 4(5)-substituted 2-amino-5(4)-hydroxyimino-5(4)H-imidazoles and their transformation into the corresponding 3-substituted 5-amino-1,2,4-oxadiazoles

Treatment of 4(5)-phenyl(or alkyl)-2-aminoimidazoles with isoamyl nitrite in acetic acid afforded the corresponding 4(5)-substituted 2-amino-5(4)-hydroxyimino-5(4)H-imidazoles which by heating in water were transformed into 3-benzoyl(or acyl)-5-amino-1,2,4-oxadiazoles.