Journal
TETRAHEDRON LETTERS
Volume 58, Issue 21, Pages 2014-2018Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2017.04.003
Keywords
Garratt-Braverman cyclization; Minor-groove binding; Intercalation; Combilexin; UV/Vis absorption; Fluorescence quenching
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Funding
- CSIR, Government of India [02 (0014)/11/EMR-II]
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Three crescent shaped heterocycle-fused phenanthrene based systems 1-3 have been synthesized starting from benzene (or substituted benzene) 1,2-bis-propargyl alcohols. Bis-alkylation with propargylic bromides provided the key intermediate, the bis-propargyl bis-ethers. In spite of the possibility of many competing reactions, the latter underwent facile double Garratt-Braverman cyclization to provide compounds 1-3 in near quantitative yield, in a striking reaction involving the formation of four C-C bonds in a single step. Compounds 1-3 showed binding interaction with DNA, predominantly, via groove binding along with partial intercalation (combilexins). Molecular docking study supported the proposed binding modes. (C) 2017 Elsevier Ltd. All rights reserved.
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