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Mohanlal S, Saha D, Pandey S, Acharya R, Sharma NK. Synthesis of R-GABA Derivatives via Pd(II) Catalyzed Enantioselective C(sp 3)-H Arylation and Virtual Validation with GABA B1 Receptor for Potential leads. Chem Asian J 2024:e202400064. [PMID: 38497556 DOI: 10.1002/asia.202400064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 02/20/2024] [Accepted: 03/18/2024] [Indexed: 03/19/2024]
Abstract
GABA (γ-amino butyric acid) analogues like baclofen, tolibut, phenibut, etc., are well-known GABAB1 inhibitors and pharmaceutically important drugs. However, there is a huge demand for more chiral GABA aryl analogues with promising pharmacological actions. Here, we demonstrate the chiral ligand acetyl-protected amino quinoline (APAQ) mediated enantioselective synthesis of GABAB1 inhibitor drug scaffolds from easily accessible GABA via Pd-catalyzed C(sp3)-H activation. The synthetic methodology shows moderate to good yields, up to 74% of ee. We have successfully demonstrated the deprotection and removal of the directing group to synthesize R-tolibut in 86% yield. Further, we employed computation to probe the binding of R-GABA analogues to the extracellular domain of the human GABAB1 receptor. Our Rosetta-based molecular docking calculations show better binding for four R-enantiomers of GABA analogues than R-baclofen and R-phenibut. In addition, we employed GROMACS MD simulations and MMPB(GB)SA calculations to identify per-residue contribution to binding free energy. Our computational results suggest analogues (3R)-4-amino-3-(3,4-dimethylphenyl) butanoic acid, (3R)-4-amino-3-(3-fluorophenyl) butanoic acid, (3R)-3-(4-acetylphenyl)-4-aminobutanoic acid, (3R)-4-amino-3-(4-methoxyphenyl) butanoic acid, and (3R)-4-amino-3-phenylbutanoic acid are potential leads which could be synthesized from our methodology reported here.
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Affiliation(s)
- Smitha Mohanlal
- School of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar, Jatni, 752050
- Homi Bhabha National Institute (HBNI), Training School Complex, Anushaktinagar, Mumbai, 400094, India
| | - Diprupa Saha
- School of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar, Jatni, 752050
- Homi Bhabha National Institute (HBNI), Training School Complex, Anushaktinagar, Mumbai, 400094, India
| | - Shubhant Pandey
- School of Biological Sciences, National Institute of Science Education and Research, Bhubaneswar, Jatni, 752050
- Homi Bhabha National Institute (HBNI), Training School Complex, Anushaktinagar, Mumbai, 400094, India
| | - Rudresh Acharya
- School of Biological Sciences, National Institute of Science Education and Research, Bhubaneswar, Jatni, 752050
- Homi Bhabha National Institute (HBNI), Training School Complex, Anushaktinagar, Mumbai, 400094, India
| | - Nagendra K Sharma
- School of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar, Jatni, 752050
- Homi Bhabha National Institute (HBNI), Training School Complex, Anushaktinagar, Mumbai, 400094, India
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