2
|
Chemical Synthesis of the Epimeric (23R)- and (23S)-Fluoro Derivatives of Bile Acids via Horner-Wadsworth-Emmons Reaction. Lipids 2015; 50:919-26. [PMID: 26193795 DOI: 10.1007/s11745-015-4050-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 07/08/2015] [Indexed: 10/23/2022]
Abstract
A method for the synthesis of two (23R)- and (23S)-epimeric pairs of 23-fluoro-3α,7α,12α-trihydroxy-5β-cholan-24-oic acid and 23-fluoro-3α,7α-dihydroxy-5β-cholan-24-oic acid is described. The key intermediates, 23,24-dinor-22-aldehyde peracetates were prepared from cholic and chenodeoxycholic acids via the 24-nor-22-ene, 24-nor-22ξ,23-epoxy, and 23,24-dinor-22-aldehyde derivatives. The Horner-Wadsworth-Emmons reaction of the 23,24-dinor-22-aldehydes using triethyl 2-fluoro-2-phosphonoacetate in the presence of LiCl and 1,8-diazabicyclo[5,4,0]undec-7-ene (DBU), and subsequent hydrogenation of the resulting 23ξ-fluoro-22-ene ethyl esters, followed by hydrolysis, gave a mixture of the epimeric (23R)- and (23S)-fluorinated bile acids which were resolved efficiently by preparative RP-HPLC. The stereochemical configuration of the fluorine atom at C-23 in the newly synthesized compounds was confirmed directly by the X-ray crystallographic data. The (1)H and (13)C NMR spectral differences between the (23R)- and (23S)-epimers were also discussed.
Collapse
|
3
|
Bruno RD, Vasaitis TS, Gediya LK, Purushottamachar P, Godbole AM, Ates-Alagoz Z, Brodie AMH, Njar VCO. Synthesis and biological evaluations of putative metabolically stable analogs of VN/124-1 (TOK-001): head to head anti-tumor efficacy evaluation of VN/124-1 (TOK-001) and abiraterone in LAPC-4 human prostate cancer xenograft model. Steroids 2011; 76:1268-79. [PMID: 21729712 PMCID: PMC3171567 DOI: 10.1016/j.steroids.2011.06.002] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Revised: 06/08/2011] [Accepted: 06/14/2011] [Indexed: 12/15/2022]
Abstract
In a continuing study of our clinical candidate 5 VN/124-1 (TOK-001) and analogs as potential agents for prostate cancer therapy, putative metabolites (10, 15 and 18) of compound 5 were rationally designed and synthesized. However, none of these agents were as efficacious as 5 in several in vitro studies. Using western blot analysis, we have generated a preliminary structure-activity relationship (SAR) of 5 and related analogs as androgen receptor ablative agents (ARAAs). In vivo using the androgen-dependent LAPC-4 prostate cancer xenograft model, we demonstrated for the first time that 5 is more efficacious than the 17-lyase inhibitor 3 (abiraterone)/4 (abiraterone acetate) that is currently in phase III clinical trials. In our desire to optimize the potency of 5, compounds 6 (3ξ-fluoro-) and 9 (3β-sulfamate-) designed to increase the stability and oral bioavailability of 5, respectively were evaluated in vivo. We showed, that on equimolar basis, compound 6 was ∼2-fold more efficacious versus LAPC-4 xenografts than 5, but the toxicity observed with 6 is of concern. These studies further demonstrate the efficacy of 5 in a clinically relevant prostate cancer model and justify its current clinical development as a potential treatment of prostate cancer.
Collapse
Affiliation(s)
- Robert D. Bruno
- Department of Pharmacology and Experimental Therapeutics, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201, USA
| | - Tadas S. Vasaitis
- Department of Pharmacology and Experimental Therapeutics, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201, USA
| | - Lalji K. Gediya
- Department of Pharmaceutical Sciences, Jefferson School of Pharmacy, Thomas Jefferson University, 130 South 9 Street, Philadelphia 19107, PA, USA
- Department of Pharmacology and Experimental Therapeutics, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201, USA
| | - Puranik Purushottamachar
- Department of Pharmaceutical Sciences, Jefferson School of Pharmacy, Thomas Jefferson University, 130 South 9 Street, Philadelphia 19107, PA, USA
- Department of Pharmacology and Experimental Therapeutics, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201, USA
| | - Abhijit M. Godbole
- Department of Pharmaceutical Sciences, Jefferson School of Pharmacy, Thomas Jefferson University, 130 South 9 Street, Philadelphia 19107, PA, USA
- Department of Pharmacology and Experimental Therapeutics, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201, USA
| | - Zeynep Ates-Alagoz
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Ankara University, 06100Tandogan, Ankara-Turkey
- Department of Pharmaceutical Sciences, Philadelphia College of Pharmacy, University of the Sciences, Philadelphia, PA 19104, USA
| | - Angela M. H. Brodie
- Department of Pharmacology and Experimental Therapeutics, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201, USA
| | - Vincent C. O. Njar
- Department of Pharmaceutical Sciences, Jefferson School of Pharmacy, Thomas Jefferson University, 130 South 9 Street, Philadelphia 19107, PA, USA
- Kimmel Cancer Center, Thomas Jefferson University, 130 South 9 Street, Philadelphia 19107, PA, USA
- Department of Pharmacology and Experimental Therapeutics, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201, USA
- Corresponding author: Tel: (215) 503 7468, Fax: (215) 503 9052;
| |
Collapse
|
5
|
Decréau RA, Marson CM. Preparation of 3,17‐ and 3,20‐Difluoro‐Derivatives of the Androst‐5‐ene and Pregn‐5‐ene Series. SYNTHETIC COMMUN 2004. [DOI: 10.1081/scc-200039449] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|