Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Kai Edelmann"'
Autor:
Willi Kantlehner, Kai Edelmann, Markus Vettel, Hansjörg Lehmann, Jochen Mezger, null Wolfgang Frey
Publikováno v:
Zeitschrift für Naturforschung B. 78:63-73
Orthoamides of alkyne carboxylic acids 17 react with 1,2- and 1,3-dioles to give vinylogous cyclic urea acetals. Analogous reactions with ethandithiol deliver vinylogous thioureas. The condensation of orthoamides 17 with 3,5-dimethyl-4-nitroisoxazol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be5bf368ed0576145f10c2d10ea3bd15
https://doi.org/10.1515/znb-2022-0302
https://doi.org/10.1515/znb-2022-0302
Publikováno v:
Zeitschrift für Naturforschung B. 78:307-327
The reaction of keten-O,N-acetals, which can exist in tautomeric forms, with orthoamides of alkine carboxylic acids 4 affords pyridine carboxylic acid esters or -nitriles. Analogous reactions of the orthoamides 4 with imidazole-2-yliden-acetic acid e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e79020496f364abb8e1240cbe9b72ccc
https://doi.org/10.1515/znb-2022-0113
https://doi.org/10.1515/znb-2022-0113
Publikováno v:
Zeitschrift für Naturforschung B. 77:743-755
Orthoamides of alkynecarboxylic acids 10 react with 2-thienyl-acetonitrile under condensation to give ketene aminals. In the reaction of orthoamides 10 with 2-benzimidazolyl-acetonitrile tricyclo[1,2-a]benzimidazol-4-carbonitriles are formed under si
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::db8914ca4ab00dfaa102dd57454a19a5
https://doi.org/10.1515/znb-2022-0050
https://doi.org/10.1515/znb-2022-0050
Publikováno v:
Zeitschrift für Naturforschung B. 76:417-430
Orthoamides of alkynecarboxylic acid 15 condense with enolisable β-dicarbonyl compounds and as well with acetophenones to give 3-acryl-1,1-bis(dimethyl-amino)-1,3-butadienes. Some acylbutadienes cyclize affording 2-pyranon-derivatives 33 upon heatin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::892df280952c0ce2197f802df37a3541
https://doi.org/10.1515/znb-2021-0005
https://doi.org/10.1515/znb-2021-0005
Publikováno v:
Zeitschrift für Naturforschung B. 73:689-701
The orthoamides of alkyne carboxylic acids 4 react with acetophenones 5 – catalyzed by trialkylborates – to give ketene aminals 6, which can be transformed to 5-amino-5-hydrazino-penta-2,4-dien-1-ones 10 by treatment with 2,4-dinitro-phenylhydraz
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::83eb4d5332fb055f7685edc149e974ce
https://doi.org/10.1515/znb-2018-0065
https://doi.org/10.1515/znb-2018-0065
Publikováno v:
Zeitschrift für Naturforschung B. 73:623-634
The ketene aminals 9a–e can be prepared from the orthoamide of propiolic acid 6a and 2-methyl-5-phenacyl-1,3,4-thiadiazoles 8a–e under mild conditions. The crystal structure analyses of 9b and 9d reveal that compounds 9 can be regarded as 1,4-dip
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::464909a256d77218a547ad24afbab404
https://doi.org/10.1515/znb-2018-0064
https://doi.org/10.1515/znb-2018-0064
Publikováno v:
Zeitschrift für Naturforschung B. 67:913-920
The cleavage of orthoamides of alkynecarboxylic acids 5 with trimethylsilyl azide affords 4-[bis(dimethylamino)methylene]-4H-1,2,3-triazoles 9. By treatment of the bis-orthoamide of acetylenedicarboxylic acid 1 with trimethylsilyl azide and benzoyl a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c37a15a5b1d296fa292d2be6ba8980d4
https://doi.org/10.5560/znb.2012-0124
https://doi.org/10.5560/znb.2012-0124
Publikováno v:
Applied Catalysis A: General. 336:148-154
The course of condensation reactions of alkyne carboxylic acid orthoamides 17a , b is strongly influenced by the nature of the solvent used. Non-acidic or at least low-acidic polar solvents possessing high E T (30) values are best suited for these re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b7bf9258c0d1fee9acf365084f5448f
https://doi.org/10.1016/j.apcata.2007.08.027
https://doi.org/10.1016/j.apcata.2007.08.027
Autor:
Jochen Mezger, Kai Edelmann, Rüdiger Stieglitz, Hansjörg Lehmann, Sebastian Ladendorf, Willi Kantlehner, Markus Vettel, Ralf Kreß, Wolfgang Frey
Publikováno v:
Zeitschrift für Naturforschung B. 62:1015-1029
The orthoamide derivatives 4 react with amidines 10 and guanidines 11 to give 4-dimethylaminopyrimidines 12. The 3-dimethylamino-pyrazoles 13a - c can be prepared from orthoamides 4 and hydrazine. The hydrazine derivative 14, whose constitution was e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::63edf3a0a8c62f5d3aa442ac45b6030c
https://doi.org/10.1515/znb-2007-0804
https://doi.org/10.1515/znb-2007-0804
Autor:
Kai Edelmann, Ivo C. Ivanov, Markus Vettel, Hansjörg Lehmann, Rüdiger Stieglitz, Willi Kantlehner
Publikováno v:
Journal f�r Praktische Chemie/Chemiker-Zeitung. 340:408-423
Orthoamides. LI. Push-Pull-Butadienes and Heterocycles from Alkyne Carboxylic Acid Orthoamides and CH2-acidic Compounds The acetylides 4b, 4f react with N,N,N′,N′,N″,N″-hexamethylguanidiniumchloride (5) to give the orthoamides 6b, 6f, resp. F
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::16e5e91e0f5afbe5a665046d06a06bc9
https://doi.org/10.1002/prac.19983400503
https://doi.org/10.1002/prac.19983400503