scispace - formally typeset
Search or ask a question

Showing papers in "Archiv Der Pharmazie in 1979"


Journal ArticleDOI
TL;DR: A series of new thieno[2,3‐d]pyrimidine derivatives with a carbocyclic ring fused at positions 5 and 6 have been synthesised in order to study their pesticidal activity.
Abstract: A series of new thieno[2,3-d]pyrimidine derivatives with a carbocyclic ring fused at positions 5 and 6 have been synthesised in order to study their pesticidal activity. Some of the compounds exhibit significant biological activity. Thieno[2,3-d]pyrimidine als potentielle Chemotherapeutika Eine Reihe von neuen Thieno[2,3-d]pyrimidin-derivaten mit einem in 5,6-Position ankondensierten carbozyklischem Ring wurde synthetisiert und auf pestizide Aktivitat untesucht. Einige der einem Screening unterworfenen Verbindungen zeigten signifikante biologische Wirksamkeit.

38 citations


Journal ArticleDOI
TL;DR: In this article, the synthesis and properties of 2,3-dihydro-1H-pyrrolizines from 2-alkyl-Δ1 pyrrolines as one step preparation is described.
Abstract: Die Darstellung von 2,3-Dihydro-1H-pyrrolizinen aus 2-Alkyl-Δ1-pyrrolinen in einer „Eintopfreaktion” wird beschrieben Spektroskopische Daten und chemisches Verhalten dieser Verbindungen zeigen ihre Verwandtschaft zum Pyrrol-Grundkorper Synthesis and Properties of 2,3-Dihydro-1H-pyrrolizines The synthesis of 2,3-dihydro-1H-pyrrolizines from 2-alkyl-Δ1-pyrrolines as one-step-preparation is described The spectroscopic and chemical behaviour of these compounds shows that they are related to the pyrroles

32 citations


Journal ArticleDOI
TL;DR: In this paper, the nucleophilic addition to 4-Arylidenepyrazolone was shown to yield tricyclic adducts 2,4, 8 and 10 from reactive methylene compounds, such as malononitrile, alkyl malonates or cyanoacetamide.
Abstract: Arylidenpyrazolone 1 reagieren mit aktiven Methylenverbindungen wie Malonsauredinitril, Malonestern, Cyanessigestern oder Cyanacetamid zu den Addukten 2,4, 8 und 10. Die basenkatalysierte Cyclisierung gelingt nur bei 2, in allen anderen Fallen last sie sich nicht erreichen. Hingegen fuhrt Cyclisierung von 8 und 10 in Gegenwart von Saure zu den bisher unbekannten tricyclischen Systemen 16 und 18. Heterocycles via Michael Reaction, V1); Nucleophilic Additions to 4-Arylidenepyrazolones The adducts 2,4, 8 and 10 were obtained from the arylidenepyrazolones 1 and reactive methylene compounds, such as malononitrile, alkyl malonates, alkyl cyanoacetates or cyanoacetamide. Cyclisation with basic catalysis was successful with compound 2 only. On the other hand, cyclisation of 8 and 10 in the presence of acids yielded the hitherto unknown tricyclic systems 16 and 18.

30 citations




Journal ArticleDOI
TL;DR: The 4-oxo derivatives of the naphtho[1,2-d]thiazolo[3, 2-a]pyrimidine series were synthesized by nucleophilic attack.
Abstract: Zur Untersuchung der Struktur-Wirkungs-Beziehungen von Substanzen der Naphtho[1,2-d]thiazolo[3,2-a]pyrimidin-Reihe wurden die Titel-Verbindungen 5a–d zusatzlich zu den fruher beschriebenen 2-Oxo-Derivaten dargestellt. Die Darstellung erfolgte durch nucleophilen Angriff von 2-Aminonaphtho[1,2-d]thiazol (2) auf die entsprechenden β-Keto-Ester 3a–d. Die Produkte zeigten anders als die 2-Oxo-Derivate keine hypotensive Wirkung an normotensiven Ratten. Jedoch zeigten sie eine bemerkenswerte diuretische Aktivitat nach p.o. Verabreichung von 10–30 mg/kg bei den gleichen Tieren. Die Wirkung dauerte in den meisten Fallen mehr als funf Stunden. Synthesis and Bioactivities of Some Derivatives of Naphtho[1,2-d]thiazolo[3,2-a]pyrimidin-4-one In continuing the study of the structure-activity relationships of compounds of the naphtho[1,2-d]thiazolo[3,2-a]pyrimidine series, the 4-oxo derivatives 5a–d were synthesized in addition to the 2-oxo compounds reported previously. The synthesis was accomplished by nucleophilic attack of 2-aminonaphtho[1,2-d]thiazole (2) on the corresponding β-keto esters 3a–d. Unlike the 2-oxo derivatives, the products showed no hypotensive effect on normotensive rats. However, all compounds exhibited a pronounced diuretic activity in the same animals after oral administration of 10–30 mg/kg. The activity persisted in most cases for more than five hours.

22 citations


Journal ArticleDOI
Abstract: Die Umsetzung von p-Benzochinon (1) mit 13 substituierten β-Arylaminocrotonestern 2 in Propionsaure fuhrte einheitlich zu den 6-Hydroxyindolen 5. Als Begleitprodukte werden isoliert: 5-Hydroxy-indol-Derivate 3, 5-Acyloxy-4-hydroxy-indol-Abkommlinge 4 und als neuartige Reaktionsprodukte Arylamino-benzofurane 6, deren Struktur mit chemischen und spektroskopischen Methoden bewiesen wird. Der Reaktionsverlauf bei der 6-Hydroxy-indol-Bildung wird an Hand der Ergebnisse diskutiert. Synthesis of 6-Hydroxyindoles Reaction of p-benzoquinone (1) with 13 substituted β-arylaminocrotonates 2 in propionic acid yields 6-hydroxy-indoles 5. By-products are: 5-hydroxyindoles 3, 5-acyloxy-4-hydroxyindoles 4 and arylaminobenzofurans 6 as new products. The structures of the furans 6 were clarified by chemical and spectroscopical methods. The reaction path that leads to 6-hydroxyindols is discussed.

20 citations


Journal ArticleDOI
TL;DR: Syntheses of the pyrazole derivatives 2a‐c by different routes and cyclisation of the products to pyrazolo [3,4‐d] pyrimidines are reported and the structures were confirmed by spectroscopy.
Abstract: Syntheses of the pyrazole derivatives 2a-c by different routes and cyclisation of the products to pyrazolo [3,4-d] pyrimidines are reported. The structures of the compounds were confirmed by spectroscopy. A few of them were screened as pesticides. Pyrazole und Pyrazolo [3,4-d]pyrimidine als biologisch aktive Verbindungen Es wird uber die Synthese der Pyrazolderivate 2a-c auf verschiedenen Wegen und ihre Zyklisierung zu Pyrazolo[3,4-d]pyrimidinen berichtet. Die Struktur der Verbindungen wird durch Spektroskopie abgesichert, einige werden auf pestizide Wirkung getestet.

20 citations



Journal ArticleDOI
TL;DR: In this paper, the 3-oxoverbindungen of 3-deoxo-triterpenic acid (3β-yl-1′-1-amino-1''-1´-desox-o-d-sorbitol) were compared with d-glucose and d-ribose.
Abstract: 3-Amino-3-desoxo-ursol-(2), 3-Amino-3-desoxo-11-oxoursol-(5) und 3-Amino-3-desoxoglycyrrhetinsaure (3), jeweils erhalten durch reduktive Aminierung der 3-Oxoverbindungen, werden mit d-Glucose und d-Ribose in Gegenwart von Natriumcyanoborhydrid zu den Glykaminen 3-Desoxotriterpensaure-3β-yl-1′-amino-1′-desoxo-d-sorbitol. HCl 6, 8, 10 bzw. -d-ribitol. HCl 7, 9, 11 umgesetzt. Die chemischen Eigenschaften der Glykamine werden beschrieben. Zum geschmacklichen Vergleich wird ferner 3s-Diethylamino-3-desoxo-18s-glycyrrhetinsaure. HCl (12) hergestellt. Glycamines from Ursolic and 18s-Glycyrrhetic Acids 3-Amino-3-deoxo-ursolic acid (2), 3-amino-3-deoxo-11-oxoursolic acid (5) and 3-amino-3-deoxo-glycyrrhetic acid (3), each prepared by reductive amination of its 3-oxo compound, react with d-glucose and d-ribose in the presence of sodium cyanoborohydride to yield the glycamines of 3-deoxo-triterpenic acid-3β-yl-1′-amino-1′-deoxo-d-sorbitol hydrochloride 6, 8, 10 and of the corresponding d-ribitol hydrochloride 7, 9, 11. The chemical properties of these glycamines are described. For gustatoric comparison we also prepared the hydrochloride of 3β-diethylamino-3-deoxo-18β-glycyrrhetic acid (12).

16 citations



Journal ArticleDOI
TL;DR: In this paper, the enamine form of 5-aminomethinylated barbituric acids is shown to be the predominating structure of barbiture derivatives, including 4-5-propylbarbiture (4c).
Abstract: Barbitursauren 2 werden unter der Einwirkung von s-Triazin (1) aminomethinyliert. Von den entstehenden Endprodukten 4 fallt besonders die 5-Aminomethylen-1-propylbarbitursaure (4c) durch einen tumorhemmenden Effekt auf. Aus spektroskopischen Untersuchungen geht hervor, das die 5-aminomethinylierten Barbitursauren weitgehend in der Enaminform 4 vorliegen. Antitumor Drugs, X: Propyl and Isopropyl Derivatives of 5-Aminomethinylated Barbituric Acid Derivatives of barbituric acids 2 are aminomethinylated with s-triazine (1). Of the resulting products 4,5-(aminomethylene)-1-propylbarbituric acid (4c) in particular exhibits antitumor activity. Spectroscopic data indicate that the enamine form 4 is the predominating structure of 5-aminomethinylated barbituric acids.

Journal ArticleDOI
TL;DR: In this paper, the structural relationship of 22 piperidines and piperazines structurally related to dopamine was investigated, and the most active compounds showed a profile similar to that of haloperidol.
Abstract: Die Beziehungen zwischen Struktur und neuropsychotroper Wirkung von 22 dopaminanalogen Piperidin- und Piperazinderivaten werden untersucht. Die aktivsten Verbindungen haben ein dem Haloperidol ahnliches Wirkungsspektrum und erreichen dieses in Dosierungsbereich und Wirkungsbreite. Die strukturelle Verwandtschaft zu dopaminanalogen 1,2,3,4-Tetrahydro-β-carbolinen1 findet auch im Wirkungsprofil ihre Entsprechung. Dopamine Analogous Piperidines and Piperazines Structure-activity relationships of 22 piperidines and piperazines structurally related to dopamine were investigated. The most active compounds show a profile (including dose range and spectrum) similar to that of haloperidol. The structural relationship of these compounds to dopamine analogous 1,2,3,4-tetrahydro-β-carbolines1 is reflected in their action pattern.

Journal ArticleDOI
TL;DR: In this paper, the addition of lithium-1-pyrrolines to carbonyl derivatives and alkyl halides leads to homologous α-alkyl-Δ1-polypyrrolinines.
Abstract: α-Alkyl-Δ 1-pyrroline reagieren uber ihre Lithiumverbindungen mit Ketonen, Aldehyden und Estern zu β-Hydroxy- bzw. δ -Ketoalkylpyrrolinen. Bei der Umsetzung mit Alkylhalogeniden entstehen homologe α-Alkyl-Δ 1-pyrroline. Addition of Lithiated Δ1-Pyrrolines to Carbonyl Derivatives and Alkyl Halides Lithiated α-alkyl-Δ1-pyrrolines react with ketones, aldehydes and esters to yield β-hydroxy- and δ-ketoalkylpyrrolines. Reaction with alkyl halides leads to homologous α-alkyl-Δ1-pyrrolines.

Journal ArticleDOI
TL;DR: The rearrangement of 1-benzyl-1,2-dihydroisoquinolines, which had proved to be intermolecular and stereoselective or even stereospecific in nature, was assumed to occur by a bimolecular concerted mechanism as discussed by the authors.
Abstract: Die Umlagerung von 1-Benzyl-1,2-dihydroisochinolinen verlauft intermolekular, gleichzeitig jedoch stereoselektiv oder stereospezifisch. Aus diesem Grunde wurde ein bimolekularer konzertierter Mechanismus fur die Reaktion vorgeschlagen. Wenn dieser zutrifft, sollte aus S-1 bei der Umlagerung uber 3 das Iminiumsalz R-4 erhalten werden. Die Untersuchung der Konfiguration der Ausgangs- und Endprodukte durch chemische Korrelation ergab, das aus S(+) 1 bei der Umlagerung S(-) 4 entsteht, so das der postulierte Mechanismus nicht aufrechterhalten werden kann. Dihydroisoquinoline Rearrangement, XXV: Investigation of the Stereochemistry by Chemical Correlation The rearrangement of 1-benzyl-1,2-dihydroisoquinolines, which had proved to be intermolecular and stereoselective or even stereospecific in nature, was assumed to occur by a bimolecular concerted mechanism. If this hypothesis was correct, S-1 should rearrange via 3 to yield the iminium salt R-4. Investigation of the configurations of starting material and end product by chemical correlation showed, however, that S(-) 4 is obtained by rearrangement of S(+) 1. Accordingly the postulated mechanism cannot be correct.

Journal ArticleDOI
TL;DR: The 3,5-Diacyl-4-pyrone 7a and 7b wurden mit Ammoniumacetat, Benzylamin, Hydrazin, and hydrazin-Derivaten umgesetzt as discussed by the authors.
Abstract: Die 3,5-Diacyl-4-pyrone 7a und 7b wurden mit Ammoniumacetat, Benzylamin, Hydrazin und Hydrazin-Derivaten sowie Benzamidin umgesetzt. Dabei entstanden Pyridon-, Pyrazol-, Dipyrazolyl-keton-, Pyrazolyl-pyrazol-, Pyrimidin-, Pyrazolyl-pyrimidin- und Pyrazolyl-pyrimidinyl-keton-Derivate.


Journal ArticleDOI
TL;DR: In this paper, a cycloaddition reaction of nitrones with isothiocyanates commonly leads to 1,2,4-oxadiazolidine-5-thiones 3, in some rare cases however to 1.2, 4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,20,21,22,23,24
Abstract: Die Nitrone 1 cyclisieren im allgemeinen mit Isothiocyanaten 2 zu 1,2,4-Oxadiazolidin-5-thionen 3, in seltenen Fallen jedoch zu 1,2,4-Oxadiazolidin-5-onen 4. Dinitrone des Glyoxals 8 ergeben mit Isothiocyanat (Isocyanat) die Produkte 9 bzw. 10. [3+2]Cycloaddition Reactions of Nitrones with Isothiocyanates Cyclisation of nitrones 1 with isothiocyanates 2 commonly leads to 1,2,4-oxadiazolidine-5-thiones 3, in some rare cases however to 1,2,4-oxadiazolidine-5-ones 4. Glyoxal dinitrones 8 undergo reaction with isothiocyanates (isocyanates) to yield the products 9 and 10, respectively.

Journal ArticleDOI
TL;DR: The synthesis and anorectic evaluation of some fused perimidine derivatives are described in this article, where the most effective compound 4c showed no CNS response which suggests that these derivatives have a mode of anorective action which differs from that of the known psychotonic amines.
Abstract: Es wird die Darstellung einiger kondensierter Perimidin-Derivate und ihre Prufung auf anorektische Wirkung beschrieben. Die wirksamste Substanz 4c zeigte keine ZNS-Wirkung und dies weist darauf hin, das diese Derivate einen anderen anorektischen Wirkungsmechanismus als die bekannten Weckamine haben mussen. Synthesis and Anorectic Effects of Some Fused Perimidine Derivatives The synthesis and anorectic evaluation of some fused perimidine derivatives are described. The most effective compound 4c showed no CNS response which suggests that these derivatives have a mode of anorectic action which differs from that of the known psychotonic amines.


Journal ArticleDOI
TL;DR: The reaction of the 4-pyronedicarboxylate with either hydrazine, the hydrazin derivatives 7b or 7c or benzamidine lead to the pyrazoles 1, 2, 8, 9, 10 and 11, and to the pyrimidines 13 and 15.
Abstract: Der 4-Pyron-dicarbonsaureester 4 setzt sich mit Hydrazin, den Hydrazin-Derivaten 7b und 7c sowie mit Benzamidin zu den Pyrazolen 1, 2, 8, 9, 10 und 11 sowie den Pyrimidinen 13 und 15 um. Mit Piperidin und Piperazin entstehen die aminsubstituierten Isophthalsaure-Derivate 18 und 19. The Reaction of Ethyl 2,6-Dimethyl-4-pyrone-3,5-dicarboxylate with Amines Reactions of the 4-pyronedicarboxylate 4 with either hydrazine, the hydrazine derivatives 7b or 7c or benzamidine lead to the pyrazoles 1, 2, 8, 9, 10 and 11, and to the pyrimidines 13 and 15. With piperidine and piperazine the isophthalic acid derivatives 18 and 19 are formed.

Journal ArticleDOI
TL;DR: In this paper, the dibenz[b, e]azepindiones 1 and 3 react with the acetamide acetal 7a and its derivatives 7b-7g as well as with the pyrrolidone acetal 13 to yield the amino- and pyrrolino-benzazepinoquinolines 11, 12 and 17.
Abstract: 1-Amino-anthrachinon (2) sowie die Dibenz[b,e]azepindione 1 und 3 lassen sich mit den Acetamidacetal-Derivaten 7a–7g sowie dem Pyrrolidonacetal 13 zu den Amino- und Pyrrolonaphtho-chinolinen 8a–8g und 15 sowie den Amino- und Pyrrolino-benzazepinochinolinen 11, 12 und 17 umsetzen. Aminonaphtho- and Aminobenzazepino-quinolines 1-Amino-anthraquinone (2) and the dibenz[b, e]azepindiones 1 and 3 react with the acetamide acetal 7a and its derivatives 7b–7g as well as with the pyrrolidone acetal 13 to yield the amino- and pyrrolonaphthoquinolines 8a–8g and 15 as well as the amino- and pyrrolino-benzazepinoquinolines 11, 12 and 17.

Journal ArticleDOI
TL;DR: By condensation of benzylisothiourea (1) with the fluorinated β-diketones 2a-g were obtained as mentioned in this paper, which exhibits antimycotic activity.
Abstract: Aus der Kondensation von Benzylisothioharnstoff (1) mit den durch Fluor substituierten β-Diketonen 2a-g gehen die fluorierten 2-Benzylthiopyrimidine 3a-g hervor, unter denen sich Vertreter mit antimykotischer Wirksamkeit wie 3b finden. Antimycotic Drugs, IX: Fluorinated 2-Benzylthiopyrimidines By condensation of benzylisothiourea (1) with the fluorinated β-diketones 2a-g, the fluorinated 2-benzylthiopyrimidines 3a-g were obtained. Compound 3b exhibits antimycotic activity.

Journal ArticleDOI
TL;DR: In this article, the ability of 2,3-dihydro-1,4-benzothiazin-3-ones to condense at position 2 with carboxylic esters, aldehydes, amide acetals and carbon disulfide/diethyl sulfate was investigated.
Abstract: Methoden zur Darstellung der 2,3-Dihydro-1,4-benzothiazin-3-one 5a und 5b sowie ihrer S-Oxide bzw. S,S-Dioxide 6 bzw. 4a und 4b wurden uberpruft und variiert; die Fahigkeit zur Kondensation dieser Verbindungen in 2-Stellung mit Carbonsaureestern, Aldehyden, Amidacetalen und Schwefel-kohlenstoff/Dimethylsulfat wurde untersucht. 2,3-Dihydro-1,4-benzothiazin-3-ones Methods for the preparation of the 2,3-dihydro-1,4-benzothiazin-3-ones 5a and 5b as well as their S-oxides and S,S-dioxides 6, 4a und 4b were investigated. The ability of these compounds to condense at position 2 with carboxylic esters, aldehydes, amide acetals and carbon disulfide/diethyl sulfate was investigated.

Journal ArticleDOI
TL;DR: In this paper, 3-Phenylsydnone was subjected to chlorosulphonation for the first time and the resulting sydnonesulphonyl chloride was treated with amines and phenols to obtain sulphonamides and sulphonates, respectively.
Abstract: 3-Phenylsydnone was subjected to chlorosulphonation for the first time. The resulting sydnone-sulphonyl chloride was treated with amines and phenols to obtain sulphonamides and sulphonates, respectively. Sulfonamid- und Sulfonatderivate von Sydnonen 3-Phenylsydnon wird erstmals der Chlorsulfonierung unterworfen und das erhaltene Sydnonsulfonylchlorid mit Aminen und Phenolen behandelt, um die Sulfonamide bzw. Sulfonate zu erhalten.

Journal ArticleDOI
TL;DR: Aminolysis of derivatives of trans-3-Phenylglycidic acid with aromatic amines which differ in basicity and steric properties leads to derivatives of 3-amino-2-hydroxy-3phenylpropanecarboxylic acid by nucleophilic oxiran ring cleavage.
Abstract: 3-Phenylglycidsaure-Derivate werden von aromatischen Aminen unterschiedlicher Basizitat und Raumerfullung unter Offnung des Epoxid-Ringes stets in 3-Stellung angegriffen und bilden so 3-Amino-2-hydroxy-3-phenyl-propansaure-Derivate. Wie die gegenseitige Uberfuhrung der Verbindungen 2a4a6a8 zeigt, geschieht dies unabhangig davon, ob es sich um Glycidsaure oder deren Ester, Amid, bzw. Anilid handelt. Der Strukturbeweis der erhaltenen Aminolyseprodukte erfolgt durch Hydrogenolyse zu 3-Phenylmilchsaureamid. Aminolysis of Derivatives of trans-3-Phenylglycidic Acid with Aromatic Amines, IV Treatment of derivatives of 3-phenylglycidic acid with aromatic amines which differ in basicity and steric properties leads to derivatives of 3-amino-2-hydroxy-3-phenylpropanecarboxylic acid by nucleophilic oxiran ring cleavage. Acid, ester, amide and anilide react in the same way, as is shown by the interconversion of the products 2a, 4a, 6a and 8. Hydrogenolysis of the compounds of type 4 to 3-phenyllactic amide confirms the structures of the products.

Journal ArticleDOI
TL;DR: The 1,3-dicarbonyl compounds 2 and 6 cyclisize on heating with polyphosphoric acid (PPA) to form the quinolones 3 and 7 as mentioned in this paper.
Abstract: Die 1,3-Dicarbonylverbindungen 2 und 6 cyclisieren beim Erhitzen mit Polyphosphorsaure zu den Chinolonen 3 und 7. Die Chinolone 3a, 7a und 10 geben mit Ethyljodid/NaH/DMF ausschlieslich die O-alkylierten Chinoline 11. 1,3-Dicarbonyl Compounds, XI: Fused Quinolones II, N- and O-Alkylated Products The 1,3-dicarbonyl compounds 2 and 6 cyclisize on heating with polyphosphoric acid (PPA) to form the quinolones 3 and 7. The quinolones 3a, 7a and 10 react with ethyliodide/NaH/DMF to give exclusively O-alkylated quinolines 11.

Journal ArticleDOI
TL;DR: The resolution of 5-amino-4,5,6,7-tetrahydrobenzimidazole (3), the determination of the absolute configuration and the histamine-like activity of the enantiomers on the guinea-pig ileum (H1) and atrium (H2) are reported in this paper.
Abstract: Es werden die Racemattrennung von 5-Amino-4,5,6,7-tetrahydro-benzimidazol (3), die Bestimmung der absoluten Konfiguration sowie die histaminartige Wirksamkeit der Enantiomere am Ileum (H1) und Atrium (H2) des Meerschweinchens beschrieben. Structure-Activity Relationship of Histamine Analogues, XVIII: Absolute Configuration and Histamine-like Activity of the Enantiomers of 5-Amino-4,5,6,7-tetrahydrobenzimidazole The resolution of 5-amino-4,5,6,7-tetrahydrobenzimidazole (3), the determination of the absolute configuration and the histamine-like activity of the enantiomers on the guinea-pig ileum (H1) and atrium (H2) are reported.


Journal ArticleDOI
TL;DR: In this paper, 2-Methyl-1,4-naphthoquinone (1) reacts with 4-aminophenol to yield 2-methyl-1.4 naphthoequinone-4-[(4-hydroxyphenyl)imine] (6), 2-methyl-3-(4′-hydronyl)aminomethyl]-1, 4-Naphthoxymethyl]-1.
Abstract: 2-Methyl-1,4-naphthochinon (1) reagiert mit 4-Aminophenol zu 2-Methyl-1,4-naphthochinon-4-(N-4′-hydroxyphenyl)-imin (6), 2-Methyl-3-(4′-hydroxyphenyl)amino-1,4-naphthochinon (7) und 2-(N-4′-Hydroxyphenyl)-aminomethyl-1,4-naphthochinon (8) (MS, 1H-NMR, IR, UV/S). Tautomere der Reaktionsprodukte werden diskutiert. Die Farbe von 8 wird auf intramolekulare CT-Wechselwirkung zwischen Chinon- und Anilinteil des Molekuls zuruckgefuhrt. Quinone-Amine-Reactions, I: Reactions Between 2-Methyl-1,4-naphthoquinone and 4-Aminophenol 2-Methyl-1,4-naphthoquinone (1) reacts with 4-aminophenol to yield 2-methyl-1,4-naphthoquinone-4-[(4-hydroxyphenyl)imine] (6), 2-methyl-3-[(4-hydroxyphenyl)amino]-1,4-naphthoquinone (7) and 2-[(4-hydroxyphenyl)aminomethyl]-1,4-naphthoquinone (8) (MS, 1H-NMR,IR,UV/Vis). Tautomeric forms of the reaction products are discussed. The color of 8 is explained by intramolecular charge transfer interaction of the quinone and aniline parts of the molecule.