Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 13, Issue 46, Pages 11292-11301Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ob01828e
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Funding
- NIH [R21 CA139359, CA172379]
- Office of the Dean of the College of Medicine
- NIH from the National Institute of General Medical Sciences [P20 RR020171]
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The regiospecific Mannich aminomethylation of 7-hydroxyisoflavonoids using bis(N,N-dimethylamino)methane afforded C-8 substituted N,N-dimethylaminomethyl adducts, and the regioselective aminomethylation of 5-hydroxy-7-methoxyisoflavonoids afforded predominantly the C-6 substituted N,N-dimethylaminomethyl adducts. Acetylation of these C-6 or C-8 Mannich bases with potassium acetate in acetic anhydride provided access to the corresponding acetoxymethyl derivatives that were subsequently converted to hydroxymethyl-and methoxymethyl-substituted 5-hydroxy- or 7-hydroxyisoflavonoids related to naturally occurring flavonoids. The C-8 acetoxymethyl, hydroxymethyl or methoxymethyl-substituted isoflavonoids possessed promising inhibitory potency in the low micromolar range in a prostate cancer PC-3 cell proliferation assay.
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