Journal
TETRAHEDRON LETTERS
Volume 48, Issue 18, Pages 3151-3154Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.03.043
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Dodecaborate-conjugated cholesterols 3a-c were synthesized for liposomal boron delivery systems in neutron capture therapy. The current synthesis is based on the S-alkylation protocol of the cyanoethyl-protected BSH with alkyl halides. The dodecaborate-conjugated cholesterol 3a liposome, which was prepared from dimyristoylphosphatidylcholine (DMPC), cholesterol, dodecaborate-conjugated cholesterol 3a, and polyethyleneglycol-conjugated distearoylphosphatidylethanolamine (PEG-DSPE) (1:0.5:0.5:0.1), exhibited higher cytotoxicity than BSH at the same boron concentration and IC50 values of the 3a liposome and BSH toward colon 26 cells were estimated as 25 and 78 ppm of boron concentration, respectively. (c) 2007 Elsevier Ltd. All rights reserved.
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