Zobrazeno 1 - 10
of 59
pro vyhledávání: '"Ivo C. Ivanov"'
Autor:
Nikolay G. Vassilev, Ivo C. Ivanov
Publikováno v:
Molecules, Vol 28, Iss 24, p 8004 (2023)
Studies of the rotational barrier energy of the amide bond using quantum computing and nuclear magnetic resonance (NMR) are focused mainly on its use as a model of the peptide bond. The results of these studies are valuable not only in terms of the f
Externí odkaz:
https://doaj.org/article/979f8b6db67b4404a05aac3fba31cfd2
Autor:
Ivo C. Ivanov, Edmont V. Stoyanov
Publikováno v:
Molecules, Vol 9, Iss 8, Pp 627-631 (2004)
The reaction of 4-hydroxycoumarin (1) with some primary amines 2a-h and morpholine (2i) under microwave irradiation occurred without opening of the lactone ring to give N-substituted 4-aminocoumarins 3a-i in excellent yields. Under the same experimen
Externí odkaz:
https://doaj.org/article/42746a4fec2945898bc8d5bd20b3e2cd
Publikováno v:
Molecules, Vol 5, Iss 1, Pp 19-32 (2000)
Reaction of 4-hydroxy-6-methyl-2-pyrone (1a) as well as 4-hydroxy-6-methyl-2(1H)-pyridones (1b-d) with arylmethylene malononitriles or arylmethylene methyl cyanoacetates (2a-h) leads to the formation of the very stable 5,6-fused bicyclic 2-amino-4Hpy
Externí odkaz:
https://doaj.org/article/ab2382bf95604a50bec80a0351f68691
Autor:
Benoit Louis, Ivo C. Ivanov, Björn Sievers, Wolfgang Frey, Jochen Mezger, Jean Sommer, Xavier Samain, Willi Kantlehner, Georg Ziegler, Silvia Leonhardt
Publikováno v:
Zeitschrift für Naturforschung B. 74:709-732
By treatment of ethers of phenol, resorcinol, 2-napththol, alkylanisoles 10, 13, 15, 17, 20, 22, 24, 28 with formic acid/borontrichloride the aromatic aldehydes 11, 14, 16, 18, 21, 23, 25, 26, 29 can generally be prepared in low yields. The formylati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fb3013096d73a26563083249eb6c7019
https://doi.org/10.1515/znb-2019-0076
https://doi.org/10.1515/znb-2019-0076
Autor:
Ivo C. Ivanov, Georg Ziegler, Jochen Mezger, Oliver Scherr, Michael Csiesielski, Alain Goeppert, Markus Wezstein, Sylvia Leonhardt, Willi Kantlehner
Publikováno v:
Zeitschrift für Naturforschung B. 69:525-532
Tris(chloromethyl)amine (4) can be prepared by chloromethylation of urotropin with paraformaldehyde or 1,3,5-trioxane and ethyl-trichlorosilane in good yields. Photochlorination of tris(chloromethyl)amine affords tris(dichloromethyl)amine (2). Both r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5639ec1a722047ee2fe7835d287468b4
https://doi.org/10.5560/znb.2014-3270
https://doi.org/10.5560/znb.2014-3270
Publikováno v:
Zeitschrift für Naturforschung B. 69:519-524
1,3-Dimethylthymine can be prepared in a single-step reaction by heating a mixture of N-methylpropionamide and the Bredereck-Simchen reagent [tert-butyloxy-bis(dimethylamino) methane].
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ec110b7f1fe1c3a0832ca4ba392112c5
https://doi.org/10.5560/znb.2014-4053
https://doi.org/10.5560/znb.2014-4053
Publikováno v:
Zeitschrift für Naturforschung B. 67:331-336
2-Formyl-1,1,3,3-tetramethylguanidine (1) could be prepared from tris(dimethylamino)ethoxymethane (3a) and formamide (4). Surprisingly, guanidine 1 does not result from the reaction of 1,1,3,3-tetramethylguanidine with formylating reagents such as di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e53aff797e99fc44dd1ad5469bd6f9e5
https://doi.org/10.1515/znb-2012-0406
https://doi.org/10.1515/znb-2012-0406
Autor:
Ivo C. Ivanov, Thorsten Moschny, Oliver Scherr, Wolfgang Frey, Horst Hartmann, Bahari Souley, Boyan Iliev, Jochen Mezger, Milen G. Bogdanov, Ralf Kreß, Tillmann Viefhaus, Ioannis Tiritiris, Georg Ziegler, Günther Dospil, Ulrich Jäger, Willi Kantlehner
Publikováno v:
Zeitschrift für Naturforschung B. 65:873-906
N, N, N´, N´-Tetraalkyl-chloroformamidinium chlorides 6 are prepared from N, N, N´, N´-tetraalkylureas 5 and phosgene in acetonitrile. The iminium salts 6 react with primary and secondary amines in the presence of triethylamine to give N, N, N´,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b785910d409332b101b8ad58af23ada1
https://doi.org/10.1515/znb-2010-0712
https://doi.org/10.1515/znb-2010-0712
Autor:
Ivo C. Ivanov, Toma N. Glasnov
Publikováno v:
Synthetic Communications. 38:1579-1588
Coumarin and its analogs are considered privileged scaffolds in the current synthetic and pharmacological research. The chemical behavior of enaminocarbaldehydes of the coumarin moiety under intramolecular Wittig reaction conditions in the presence o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b82f310baea2b931ea7825ffb479c205
https://doi.org/10.1080/00397910801929465
https://doi.org/10.1080/00397910801929465
Publikováno v:
Journal of Heterocyclic Chemistry. 45:177-180
Some novel 1,2-fused 5H-chromeno[4,3-b]pyridin-5-ones (5a,b) and a 6H-benzo[h][1,6]naphthyridin-5-one (5c) have been synthesized starting from the 4-chlorocoumarin-3-carbaldehyde (1a) or its N-methyl-2-quinolone analogue (1b) via subsequent Knoevenag
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::99d77d886046956c9d77e33efdd3c358
https://doi.org/10.1002/jhet.5570450120
https://doi.org/10.1002/jhet.5570450120