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Dithieno[1,4]thiazines and Bis[1]benzothieno[1,4]thiazines—Organometallic Synthesis and Functionalization of Electron Density Enriched Congeners of Phenothiazine
Open AccessArticle

Unsymmetrically-Substituted 5,12-dihydrodibenzo[b,f][1,4]diazocine-6,11-dione Scaffold—A Useful Tool for Bioactive Molecules Design

1
Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warszawa, Poland
2
Biological and Chemical Research Centre, University of Warsaw, 02-089 Warszawa, Poland
3
Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, 90-363 Łódź, Poland
*
Author to whom correspondence should be addressed.
Molecules 2020, 25(12), 2855; https://doi.org/10.3390/molecules25122855
Received: 28 May 2020 / Revised: 15 June 2020 / Accepted: 16 June 2020 / Published: 20 June 2020
(This article belongs to the Special Issue Synthesis and Structure of Heterocyclic and Organometallic Compounds)
Unsymmetrically N-substituted and N,N’-disubstituted 5,12-dihydrodibenzo [b,f][1,4]diazocine-6,11-diones were synthesized in the new protocol. The desired modifications of the dibenzodiazocine scaffold were introduced at the stages of proper selection of building blocks as well as post-cyclization modifications with alkylation or acylation agents, expanding the structural diversity and possible applications of synthesized molecules. The extension of developed method resulted in the synthesis of novel: tricyclic 5,10-dihydrobenzo[b]thieno[3,4-f][1,4]diazocine-4,11-dione scaffold and fused pentacyclic framework possessing two benzodiazocine rings within its structure. Additionally, the unprecedented rearrangement of 5,12-dihydrodibenzo[b,f][1,4]diazocine-6,11-diones to 2-(2-aminophenyl)isoindoline-1,3-diones was observed under the basic conditions in the presence of sodium hydride for secondary dilactams. The structures of nine synthesized products have been established by single-crystal X-ray diffraction analysis. Detailed crystallographic analysis of the investigated tri- and pentacyclic systems has shed more light on their structural features. One cell line derived from non-cancerous cells (EUFA30—human fibroblasts) and three tumor cells (U87—human primary glioblastoma, HeLa—cervix adenocarcinoma, BICR18—laryngeal squamous cell carcinoma) were used to determine the cytotoxic effect of the newly synthesized compounds. Although these compounds showed a relatively weak cytotoxic effect, the framework obtained for 5,12-dihydrodibenzo[b,f][1,4]diazocine-6,11-dione could serve as a convenient privilege structure for the design and development of novel bioactive molecules suitable for drug design, development and optimization programs. View Full-Text
Keywords: unsymmetrical dibenzo[b,f][1,4]diazocines; X-ray diffraction analysis; cytotoxic effect; privilege structure; nitrogen heterocycles unsymmetrical dibenzo[b,f][1,4]diazocines; X-ray diffraction analysis; cytotoxic effect; privilege structure; nitrogen heterocycles
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MDPI and ACS Style

Bieszczad, B.; Garbicz, D.; Trzybiński, D.; Dudek, M.K.; Woźniak, K.; Grzesiuk, E.; Mieczkowski, A. Unsymmetrically-Substituted 5,12-dihydrodibenzo[b,f][1,4]diazocine-6,11-dione Scaffold—A Useful Tool for Bioactive Molecules Design. Molecules 2020, 25, 2855.

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