Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Rositca D, Nikolova"'
Publikováno v:
Molbank, Vol 2024, Iss 3, p M1870 (2024)
A method for the simple preparation of 2-ethoxy-N-propylbenzo[e][1,2]oxaphosphinine-3-carboxamide 2-oxide via an ultrasound technique using catalytic amounts of CuI is reported. The formation of the amide could indicate the isomerization of the forme
Externí odkaz:
https://doaj.org/article/48fe4627fe13426ba6fabb1a0cae0efe
Publikováno v:
Molbank, Vol 2024, Iss 3, p M1875 (2024)
A simple protocol for the preparation of O-acylated enol form (R/S)-ethyl-2-acetoxy-4-phenyl-4H-chromene-3-carboxylate 5 was presented. The compound was characterized by 1H-, 13C-and DEPT135 NMR spectra, including {1H,1H} COSY, {1H,13C} HSQC, {1H,13C
Externí odkaz:
https://doaj.org/article/55d2ce06187e45b4931a0eace6f2a34a
Autor:
Rumen Lyapchev, Ana I. Koleva, Iskra Z. Koleva, Kristian Subev, Ivelina Madzharova, Kristina B. Simeonova, Nevena Petkova-Yankova, Bernd Morgenstern, Vesela Lozanova, Petar Y. Petrov, Rositca D. Nikolova
Publikováno v:
Molecules, Vol 27, Iss 21, p 7649 (2022)
Quantum-chemical calculations on the spectral properties of some aryl substituted 3-phosphonocoumarins were performed, and the effect of the substituents in the aryl moiety was evaluated. The structures possessing promising fluorescent properties wer
Externí odkaz:
https://doaj.org/article/06693d2e6f1e40f694bc7051302e42a3
Autor:
Kristina B. Simeonova, Ana I. Koleva, Anna-Mariya R. Zlatanova, Nevena I. Petkova-Yankova, Hristiyan A. Aleksandrov, Petko St. Petkov, Rositca D. Nikolova
Publikováno v:
Molecules, Vol 27, Iss 21, p 7228 (2022)
In the present study, the reaction conditions for homodimerization process of 3-acetylcoumarin were achieved under sonication using combination of zinc and metallic salt (ZnCl2 or Zn(OAc)2). Appropriate frequency and sound amplitude have been identif
Externí odkaz:
https://doaj.org/article/f729f201815a43349c2db9d195fa28bb
Publikováno v:
Synthetic Communications. 53:1134-1142
Enol phosphates were prepared from 3-diethylphosphonocoumarin under phase-transfer conditions as altered conditions for tandem hydrogenation / phosphorylation reactions. The optimized reaction conditions are characterized with high regioselectivity f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::df00910c89d5e51ba92d16998f1d2e33
https://doi.org/10.1080/00397911.2023.2212091
https://doi.org/10.1080/00397911.2023.2212091
Publikováno v:
Molecules, Vol 24, Iss 11, p 2030 (2019)
Coumarins are an important class of natural heterocyclic compounds that have attracted considerable synthetic and pharmacological interest due to their various biological activities. This review emphasizes on the synthetic methods for the preparation
Externí odkaz:
https://doaj.org/article/4d0eb782e54e426f80184b3732133413
Publikováno v:
ChemistrySelect. 5:7098-7103
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dbd8b6a44968342818c3b3293f4a00f8
https://doi.org/10.1002/slct.202001409
https://doi.org/10.1002/slct.202001409
Publikováno v:
Chemical Papers. 74:2627-2634
The regioselectivity of a one-pot hydrogenation/alkylation reaction of coumarins 1a and 1b with series of alkyl halides has been elucidated as a complementary work to reaction of acylation with the same coumarins. Reaction conditions have provided fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::431c5974fcda710aa205287fb268769d
https://doi.org/10.1007/s11696-020-01098-1
https://doi.org/10.1007/s11696-020-01098-1
Publikováno v:
Molecules, Vol 17, Iss 5, Pp 4936-4949 (2012)
A newly found reaction for the synthesis of 3,4-disubstituted 1-hydroxy-pyrrolidine-2,5-diones from 3-substituted coumarins and nitromethane has been elaborated. The reaction involved a simple and convenient experimental procedure. The applicability
Externí odkaz:
https://doaj.org/article/192a397890f042b6943deaa57b376ea4
Publikováno v:
Molecules, Vol 23, Iss 11, p 2810 (2018)
A new method for faster and simple preparation of 3,3′,4,4′-tetrahydro-3,3′-disubstituted-4,4′-biscoumarins with participation of an organozinc reagent is reported. The reaction is promoted by ultrasound irradiation and it offers a simple exp
Externí odkaz:
https://doaj.org/article/8c1ed2672cab4e77ba0a0847cd561f16