1,3-Dipolar cycloaddition of -methyl -(diethoxyphosphoryl) nitrone to N3-substituted 6-bromo-2-vinyl-3-quinazolin-4-ones gave (3-diethoxyphosphoryl) isoxazolidines substituted at C5 with quinazolinones modified at N3. All isoxazolidine cycloadducts were screened for antiviral activity against a broad spectrum of DNA and RNA viruses. Several isoxazolidines inhibited the replication of both thymidine kinase wild-type and deficient (TK⁺ and TK) varicella-zoster virus strains at EC in the 5.4⁻13.6 μΜ range, as well as human cytomegalovirus (EC = 8.9⁻12.5 μΜ). Isoxazolidines -, -, -, -/-, -, -, and -/- exhibited moderate cytostatic activity towards the human lymphocyte cell line CEM (IC = 9.6⁻17 μM).
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http://dx.doi.org/10.3390/molecules23081889 | DOI Listing |
Molecules
June 2024
Bioorganic Chemistry Laboratory, Faculty of Pharmacy, Medical University of Lodz, Muszynskiego 1, 90-151 Lodz, Poland.
In this study, a new series of and 5-substituted-3-(dibenzyloxyphosphoryl)isoxazolidines - were synthesized by the 1,3-dipolar cycloaddition reaction of -benzyl--(dibenzyloxyphosphoryl)nitrone and selected -allyl--benzylquinazoline-2,4-diones. All the obtained -isoxazolidines - and the samples enriched in respective -isomers were evaluated for anticancer activity against three tumor cell lines. All the tested compounds exhibited high activity against the prostate cancer cell line (PC-3).
View Article and Find Full Text PDFBioconjug Chem
December 2023
Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada.
Aldehydes are attractive bioorthogonal coupling partners. The ease of manipulation of aldehydes and their orthogonality to other classes of bioorthogonal reactions have inspired the exploration of chemistries, which generate irreversible conjugates. Similarly, nitrones have been shown to be potent 1,3-dipoles in bioorthogonal reactions when paired with strained alkynes.
View Article and Find Full Text PDFMolecules
October 2022
Bioorganic Chemistry Laboratory, Faculty of Pharmacy, Medical University of Lodz, Muszynskiego 1, 90-151 Lodz, Poland.
Dipolar cycloaddition of the N-substituted -(diethoxyphosphonyl)nitrones with -allyl--benzylquinazoline-2,4-diones produced mixtures of diastereoisomeric 3-(diethoxyphosphonyl)isoxazolidines with a -benzylquinazoline-2,4-dione unit at C5. The obtained compounds were assessed for antiviral and antibacterial activities. Several compounds showed moderate inhibitory activities against VZV with EC values in the range of 12.
View Article and Find Full Text PDFRSC Adv
March 2020
Dipartimento di Scienze del Farmaco, Università di Catania Viale A. Doria 6 95125 Catania Italy
Functionalized polyhedral oligosilsesquioxanes (POSS) containing an isoxazolidine nucleus have been synthesized by microwave assisted 1,3-dipolar cycloaddition of -methyl--alkoxycarbonyl nitrone 1 with POSS containing olefin moieties. The results of cycloaddition processes were rationalized by computational studies at the DFT level. The covalent conjugation of chitosan with the cycloadduct 3a leads to composite material CS-POSS 7 which was gelified using genipin as cross linking agent.
View Article and Find Full Text PDFOrg Lett
March 2019
Department of Chemistry and Chemical Biology , Harvard University, 12 Oxford Street , Cambridge , Massachusetts 02138 , United States.
The limited scope of DNA-compatible chemistry restricts the types of chemical features that can be incorporated into DNA-encoded libraries (DELs). Here, a method to synthesize DNA-conjugated polycyclic isoxazolidines via a [3 + 2] nitrone-olefin cycloaddition is described. The reaction is compatible with many olefin-containing substrates and diverse N-alkylhydroxylamines.
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