α-Glucosidase inhibition of 6-hydroxyflavones. Part 3: Synthesis and evaluation of 2,3,4-trihydroxybenzoyl-containing flavonoid analogs and 6-aminoflavones as α-glucosidase inhibitors
摘要:
The SAR studies suggested that the C-ring of baicalein (1) was not necessary for the activity, and validated the importance of 2,3,4-trihydroxybenzoyl structure of 1. Thus, a series of 2,3,4-trihydroxybenzoyi-containing flavonoid analogs were investigated for the alpha-glucosidase inhibitory activity. The results indicated that 5,6,7-trihydroxy-2-phenyl-4-quinolone (2) and 5,6,7-trihydroxyflavanone (4) showed the comparable activity to 1, while 3,5,6,7-tetrahydroxyflavone (7), 5,6,7-trihydroxyisoflavone (8), and 6-hydroxygenistein (9) showed moderate alpha-glucosidase inhibitory activity. In addition, it was found that 6-amino-5,7-dihydroxyflavone (16) was a more potent and specific rat intestinal alpha-glucosidase inhibitor than 1, and showed the comparable activity to acarbose. This is the first report on mammalian intestinal alpha-glucosidase inhibitory activity of 6-aminoflavones. Kinetic studies revealed that 16 inhibited both sucrose- and maltose-hydrolyzing activities of rat intestinal alpha-glucosidase uncompetitively/ (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis and Biochemical Evaluation of a Series of Aminoflavones as Potential Inhibitors of Protein-Tyrosine Kinases p56lck, EGFr, and p60v-src
作者:Mark Cushman、Helen Zhu、Robert L. Geahlen、Alan J. Kraker
DOI:10.1021/jm00046a020
日期:1994.9
A series of nitroflavones, 8a-p, and their corresponding aminoflavone hydrochloride salts, 10a-p, was synthesized. The preparation of nitroflavones 8b-i,o,p began with commercially available o-hydroxyacetophenones 2b-f which were converted to o-hydroxynitroacetophenones 3a-h via a variety of nitration methods, followed by condensation with nitrobenzoyl chlorides and cyclization under acidic condition. The nitroflavones 8aj-n were prepared by nitration of the corresponding flavones 7a-e. These new compounds were evaluated for their abilities to inhibit the in. vitro protein-tyrosine kinase activities of p56(1ck), EGFr, and p60(v-src), and all of the active compounds were amino-substituted flavones. None of the nitroflavones inhibited the enzymes. The most active substance in this series against p56(lck) was compound 10j, which had an IC50 of is mu M. When tested versus EGFr, compounds 10a,m displayed IC50's of 8.7 and 7.8 mu M, respectively. Against p60(v-src), 10a,m showed IC50 values of 28.8 and 38.4 mu M, respectively.
Joshi et al., Journal of the Indian Chemical Society, 1959, vol. 36, p. 59,61, 63
作者:Joshi et al.
DOI:——
日期:——
Naik; Thakor, Proceedings - Indian Academy of Sciences, Section A, 1953, # 37, p. 774,777
作者:Naik、Thakor
DOI:——
日期:——
Amin et al., Journal of the Indian Chemical Society, 1959, vol. 36, p. 833,835