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1.
The synthesis of 5,6-dihydro-4H-indeno[5,4–b]thiophene (2 b) is described.  相似文献   

2.
Summary The treatment of 2-(oxo-1-azetidinyl)-benzyltriphenylphosphponium salts9 and13b,c,d, ande with base leads to carbacephemes10 and14b,c,d, ande which can be reduced to the title compounds. The reaction of14 with acids does not result in 3-oxocephames by cleavage of the enolether function. Instead, the 3-alkoxyquinolines15b andc have been obtained.
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3.
4.
Geminal dimethyl substituted N-acylaziridines react with diphenylacetonitrite (as anion), the course of the reaction depending on the nature of the acyl group. N-carbethoxy-2.2-dimethylaziridine undergoes abnormal aziridine ring opening at the gem.-substituted C atom and migration of the carbethoxy group accompanied by 5-membered ring closure to yield as major product N-2-carbethoxylamino-3.3-diphenyl-4.4-dimethylpyrroline-1 (1). In contrast, N-tosyl-2.2-dimethylaziridine undergoes normal ring opening at the less substituted C-atom with retention of the tosyl group on the original N-atom to form N-1-tosyl-2-imino-3.3-diphenyl-5.5-dimethylpyrrolidine (10). Deacylation of the N-carbethoxy- and N-tosyl derivatives yields the substituted 2-aminopyrrolines3, 9 and11.  相似文献   

5.
Summary The direct intramolecular acylation and alkylation of the phenylsulfonylmethyl-group in the -lactames5a and7 are not successful. The postulated intermediate8 of the acylating reaction could be quenched with trimethylchlorosilane as the stable silylketale10. Desulfonation and desilylation of10 leads to the title compound12. The reaction of7 with base does not result in a carbacephame. Instead, the benzo[b]-azepinones15c,d have been obtained.
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6.
Zusammenfassung o-Benzochinolacetate, die in 3,4-Stellung unsubstituiert und in Position 5 substituiert sind, addieren Diazomethan an den Stellungen 3,4 unter Bildung von Verbindungen des Typus VIII. Diese sind thermisch leicht und in guter Ausbeute in substituierte 5-Hydroxyindazole umwandelbar. Weiterhin werden einige Umsetzungen von VIII beschrieben.Mit 1 Abbildung  相似文献   

7.
8.
Zusammenfassung Es wird über die Synthese einer Reihe von Derivaten des 4-Hydroxy-2-pyridons durch Reaktion von Enaminen, Azomethinen und Imidoestern mit Malonsäure-bis-2,4,6-trichlorphenylestern, Malonylchloriden und Kohlensuboxid (C3O2) berichtet.
Syntheses of heterocycles, CLXII: The synthesis of N-malonylheterocycles
The syntheses of some 4-hydroxy-2-pyridone derivatives by the reaction of enamines, azomethines, and carboximidates with 2.4.6-trichlorophenyl malonates, malonyl chlorides, and carbon suboxide (C3O2) is presented.
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9.
10.
By reaction of several N-phenyl-benzamidrazones with SO2F2 2-phenyl-2,5-dihydro-1,2,3,5-thiatriazole-1,1-dioxides2 a–c are formed. By reaction of N,N-diethyl-N-chlorosulfonyl-chloroformamidine8 with hydrazines the corresponding 4-diethylamino-substituted derivatives9 a–d are obtained. Methylation of2 b yields two isomeric products5 and6, whereas by methylation of9 d only one product9 b is obtained.
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11.
Zusammenfassung Aus Mono-und Dihalogen-essigsäuren bilden sich mitSchiff-schen Basen in Dimethylformamid (DMF) und POCl3 (bzw. POBr3) über labile Addukte -Lactame. Analog reagieren -Chlor-und -Brom-propionsäure.
The reaction of -chloro and -bromo acetic or propionic acids withSchiff bases inDMF in the presence of POCl3 or POBr3 yields -lactames via unstable adducts.
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12.
Zusammenfassung o-Acetoxyphenyl-acetoxyimino-glyoxal-phenylhydrazone gehen bei der Verseifung mit Na2CO3 in Derivate des 2H-1,2,3-Triazols über. Unter dem Einfluß von stärkerem Alkali (20proz. NaOH) lagern sich diese Triazole zu Triazolo-benzisoxazolen um.
Syntheses of heterocycles, CXXVIII: Synthesis of 1,2,3-triazolobenzisoxazoles
Hydrolysis of o-acetoxyphenyl-acetoximino-glyoxal-phenylhydrazones with Na2CO3 leads to derivatives of 2H-1,2,3-triazoles. Using strong alkalies (20% NaOH) the triazoles rearrange to triazolo-benzisoxazoles.


Herrn Prof. Dr.M. Rebek mit besten Wünschen zum 80. Geburtstag gewidmet.  相似文献   

13.
Three methods for the synthesis of various substituted 2-amino-1-pyrrolines are described:
  1. Cyclization of 2.2-disubstituted 4-bromobutyronitriles with ammonia to yield 3.3-disubstituted 2-amino-1-pyrrolines.
  2. Reduction of 2-aminopyrrolin-5-ones or 2-iminosuccinimides with LiAlH4, a route leading especially to 3.3.4-substituted 2-aminopyrrolines.
  3. Chlorination of 4.4-disubstituted pyrrolidones with POCl3 followed by treatment with NH3 gives 4.4-disubstituted 2-amino-1-pyrrolines.
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14.
15.
Zusammenfassung Verbindungen vom Typ des Brenzcatechins, Resorcins und Hydrochinons reagieren mit Benzylmalonsäure-bis(2,4-dichlorphenol)-ester II bei etwa 250–280° zu Derivaten des Dihydroxy-, und die des Phloroglucins zu solchen des Trihydroxycumarins.  相似文献   

16.
Zusammenfassung Propiophenon-imin bzw. Campher-imin reagieren mit monosubstit. Malonsäurechloriden zu Derivaten des 4-Hydroxypyridons-(2).
Propiophenone-imine and camphorimine react with monosubstituted malonyl chlorides to derivatives of 4-hydroxy-pyrid-2-one.
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17.
18.
19.
Zusammenfassung Die Thermolyse von -Azidozimtestern führt über die 2H-Azirine mit sehr guten Ausbeuten zu 2-Indolcarbonestern. Ein Mechanismus für die Enazid-Thermolyse wird diskutiert.
Enazides, III: Thermolysis of -azido-cinnamates. Synthesis of indol carboxylates
Thermolysis of -azidocinnamates gives, through 2H-azirines a good yield of indol-2-carboxylates. A mechanism of the enazide thermolysis is discussed.


2. Mitt.: Mh. Chem.101, 157 (1970).  相似文献   

20.
Starting with the chloromethyl compounds7 the new 2-azidomethyl-3-aryl-4-quinazolinones8 a-h were prepared, some of which have been reduced so far to the corresponding amines9 a, b, e, g by H2S in good yield. As a first example for the capability of the azides8 to undergo 1,3-dipolar cycloaddition the 2-quinazolinmethyl-1,2,3-triazol-4,5-dicarboxylicacid dimethylesters11 b, e, g were prepared by reacting8 with dimethylacetylenedicarboxylate (10).
1. Mitt.:Domanig R., Arch. Pharm., im Druck.  相似文献   

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