- In-vitro cytotoxic activities of the major bromophenols of the red alga Polysiphonia lanosa and some novel synthetic isomers
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Bioassay-guided fractionation was applied to the cytotoxic chloroform fraction of the red alga Polysiphonia lanosa. The major compounds of the most active fraction were identified using GLC-MS analysis as lanosol (1), methyl, ethyl, and n-propyl ethers of lanosol (1a, 1b, and 1c, respectively), and aldehyde of lanosol (2), although 1b appears to be an artifact arising during the fractionation procedure. These compounds and other known bromophenols were synthesized in addition to four novel isomers (3, 3a-c). The cytotoxic activities of all the synthetic compounds were determined against DLD-1 cells using the MTT assay. Compounds with IC50 50 = 1.72 and 0.80 μmol, respectively), and its effect on the cell cycle was studied using flow cytometry.
- Shoeib, Nagwa A.,Bibby, Michael C.,Blunden, Gerald,Linley, Peter A.,Swaine, David J.,Wheelhouse, Richard T.,Wright, Colin W.
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p. 1445 - 1449
(2007/10/03)
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- Synthesis of some hydroxymethylbromophenols of marine origin
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The hydroxymethylbromophenols 5, 7 and 9, isolated from marine source have been prepared in good yield.The bromo derivatives 1 and 2 of vanillin are demethylated to 4 and 6 which on borohydride reduction furnish 5 and 7 respectively.The dibromo-p-cresol (3) is oxidised to the aldehyde 8 which on borohydride reduction affords 9.
- Sudalai, A.,Rao, G. S. Krishna
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p. 858 - 859
(2007/10/02)
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