Synthesis, Biological Evaluation and Docking Studies of 13-Epimeric 10-fluoro- and 10-Chloroestra-1,4-dien-3-ones as Potential Aromatase Inhibitors
Abstract
:1. Introduction
2. Results and Discussion
2.1. Chemistry
2.2. Aromatase Inhibition Studies
2.3. Molecular Docking Studies
3. Materials and Methods
3.1. Chemical Synthesis
3.1.1. General
3.1.2. Synthesis of 10β-Fluoroestra-1,4-dien-3-one (9) or 10β-Fluoro-13α-estra-1,4-dien-3-one (17) in acetonitrile
3.1.3. Synthesis of 10β-Fluoroestra-1,4-dien-3-one (9) or 10β-Fluoro-13α-estra-1,4-dien-3-one (17) in methanol
3.1.4. General Procedure for the Fluorination with Selectfluor in Acetonitrile or in Methanol by Adding TEMPO
3.1.5. Synthesis of 10β-Fluoro-17-deoxyestra-1,4-dien-3-one (20) or 10β-Fluoro-17-deoxy-13α-estra-1,4-dien-3-one (21)
3.1.6. Fluorination of estrone (7) with Selectfluor in TFA
3.1.7. Fluorination of Estrone (7) with Selectfluor in TFA by Adding TEMPO
3.1.8. Chlorination of Estrone (7) with NCS in Acetonitrile
3.1.9. Chlorination of Estrone (7) with NCS in TFA
3.1.10. Chlorination of estrone (7) with NCS in TFA by adding TEMPO
3.1.11. Fluorination and Chlorination of Estrone (7) with Selectfluor and NCS in Acetonitrile
3.1.12. Fluorination and Chlorination of Estrone (7) with Selectfluor and NCS in TFA
3.1.13. Fluorination and Chlorination of Estrone (7) with Selectfluor and NCS in TFA by Adding TEMPO
3.2. Aromatase Inhibition
3.2.1. General
3.2.2. Preparation of Enzyme Sources
3.2.3. Incubation Procedures
3.2.4. Inhibition Studies
3.3. Computational Simulations
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample Availability: Samples of the compounds are not available from the authors. |
Entry | Substrate | Solvent | Temperature | Reaction Time | Product | Yield (%) |
---|---|---|---|---|---|---|
1 | 7 | acetonitrile | rt | 24 h | 9 | 95 |
2 | 7 | acetonitrile | 80 °C | 1 h | 9 | 97 |
3 a | 7 | acetonitrile | rt | 24 h | 9 | 3 |
4 | 7 | methanol | rt | 24 h | 9 + (15 + 16) b | 76 + (16) |
5 | 7 | methanol | reflux | 1 h | 9 + (15 + 16) | 78 + (15) |
6 a | 7 | methanol | rt | 24 h | 9 | 2 |
7 | 12 | acetonitrile | rt | 24 h | 17 | 97 |
8 | 12 | acetonitrile | 80 °C | 1 h | 17 | 98 |
9 a | 12 | acetonitrile | rt | 24 h | 17 | 4 |
10 | 12 | methanol | rt | 24 h | 17 + (18 + 19) c | 71 + (12) |
11 | 12 | methanol | reflux | 1 h | 17 + (18 + 19) | 73 + (13) |
12 a | 12 | methanol | rt | 24 h | 17 | 94 |
13 | 13 | acetonitrile | rt | 24 h | 20 | 94 |
14 | 14 | acetonitrile | rt | 24 h | 21 | 92 |
Entry | Substrate | NCS and or Selectfluor (1.1 equiv.) | Solvent | Temp. | Reaction Time | Yield Products 9 + 22 + 23 + 24 (%) |
---|---|---|---|---|---|---|
1 a | 7 | NCS | acetonitrile | rt | 24 h | 0 + 0 + 30 + 45 |
2 a | 7 | NCS | acetonitrile | 80 °C | 1 h | 0 + 0 + 30 + 45 |
3 | 7 | NCS | TFA | rt | 24 h | 0 + 55 + 10 + 20 |
4 | 7 | NCS | TFA | 80 °C | 1 h | 0 + 55 + 10 + 20 |
5 b | 7 | NCS | TFA | 80 °C | 1 h | 0 + 54 + 11 + 21 |
6 | 7 | Selectfluor | TFA | rt | 24 h | 96 + 0 + 0 + 0 |
7 | 7 | Selectfluor | TFA | 80 °C | 1 h | 95 + 0 + 0 + 0 |
8 b | 7 | Selectfluor | TFA | rt | 24 h | 95 + 0 + 0 + 0 |
9 a | 7 | NCS, Selectfluor | acetonitrile | rt | 24 h | 62 + 0 + 15 + 20 |
10 a | 7 | NCS, Selectfluor | acetonitrile | 80 °C | 1 h | 62 + 0 + 15 + 20 |
11 | 7 | NCS, Selectfluor | TFA | rt | 24 h | 36 + 26 + 11 + 16 |
12 | 7 | NCS, Selectfluor | TFA | 80 °C | 1 h | 36 + 26 + 11 + 16 |
13 b | 7 | NCS, Selectfluor | TFA | 80 °C | 1 h | 36 + 25 + 11 + 17 |
Compound | Structure | IC50 ± SD (µM) or Rel. conv. ± SD (%) |
---|---|---|
9 | IC50 = 0.49 ± 0.07 | |
20 | IC50 = 5.0 ± 2.4 | |
17 | IC50 > 10 93 ± 11 | |
21 | IC50 > 10 100 ± 6 | |
22 | IC50 = 2.4 ± 0.4 | |
Androst-4-ene-3,17-dione | IC50 = 0.22 ± 0.2 | |
Androst-1,4-diene-3,17-dione | IC50 = 0.26 ± 0.06 |
Compound | Emodel Score | Glide Score |
---|---|---|
22 | −80.929 | −4.973 |
9 | −79.415 | −4.626 |
20 | −72.055 | −4.192 |
21 | −64.406 | −3.642 |
17 | −61.448 | −3.642 |
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Jójárt, R.; Traj, P.; Kovács, É.; Horváth, Á.; Schneider, G.; Szécsi, M.; Pál, A.; Paragi, G.; Mernyák, E. Synthesis, Biological Evaluation and Docking Studies of 13-Epimeric 10-fluoro- and 10-Chloroestra-1,4-dien-3-ones as Potential Aromatase Inhibitors. Molecules 2019, 24, 1783. https://doi.org/10.3390/molecules24091783
Jójárt R, Traj P, Kovács É, Horváth Á, Schneider G, Szécsi M, Pál A, Paragi G, Mernyák E. Synthesis, Biological Evaluation and Docking Studies of 13-Epimeric 10-fluoro- and 10-Chloroestra-1,4-dien-3-ones as Potential Aromatase Inhibitors. Molecules. 2019; 24(9):1783. https://doi.org/10.3390/molecules24091783
Chicago/Turabian StyleJójárt, Rebeka, Péter Traj, Édua Kovács, Ágnes Horváth, Gyula Schneider, Mihály Szécsi, Attila Pál, Gábor Paragi, and Erzsébet Mernyák. 2019. "Synthesis, Biological Evaluation and Docking Studies of 13-Epimeric 10-fluoro- and 10-Chloroestra-1,4-dien-3-ones as Potential Aromatase Inhibitors" Molecules 24, no. 9: 1783. https://doi.org/10.3390/molecules24091783