Synthesis and Structure Activity Relationships of Chalcone based Benzocycloalkanone Derivatives as Adenosine A1 and/or A2A Receptor Antagonists. 2020

Helena D Janse van Rensburg, and Lesetja J Legoabe, and Gisella Terre'Blanche
Centre of Excellence for Pharmaceutical Sciences, North-West University, Potchefstroom, South Africa.

Adenosine A1 and/or A2A receptor antagonists hold promise for the potential treatment of neurological conditions, such as Parkinson's disease. Herein, a total of seventeen benzocycloalkanone derivatives were synthesised and evaluated for affinity towards adenosine receptors (A1 and A2A AR). The obtained results allowed for the conclusion that affinity and/or selectivity of the 2-benzylidene-1-indanone and -tetralone derivatives toward A1 and/or A2A ARs may be modulated by the nature of the substituents (either -OH, -OCH3 or morpholine) attached at position C4 of the 1-indanone core and C5 of the 1-tetralone core as well as the meta (C3') and/or para (C4') position(s) on ring B. Several compounds (2A: -B: , 3B: -C: and 4A: -B: ) possessed affinity for the A1 and/or A2A AR below 10 µM. Additionally, compounds 2A: , 3B: and 4A: were A1 AR antagonists. These results, once again, confirmed the importance of C4 methoxy-group substitution on ring A in combination with meta (C3') and/or para (C4') hydroxyl-group substitution ring B of the 2-benzylidene-1-indanone scaffold leading to drug-like compounds 1H: and 1J: with affinity in the nanomolar-range.

UI MeSH Term Description Entries
D010300 Parkinson Disease A progressive, degenerative neurologic disease characterized by a TREMOR that is maximal at rest, retropulsion (i.e. a tendency to fall backwards), rigidity, stooped posture, slowness of voluntary movements, and a masklike facial expression. Pathologic features include loss of melanin containing neurons in the substantia nigra and other pigmented nuclei of the brainstem. LEWY BODIES are present in the substantia nigra and locus coeruleus but may also be found in a related condition (LEWY BODY DISEASE, DIFFUSE) characterized by dementia in combination with varying degrees of parkinsonism. (Adams et al., Principles of Neurology, 6th ed, p1059, pp1067-75) Idiopathic Parkinson Disease,Lewy Body Parkinson Disease,Paralysis Agitans,Primary Parkinsonism,Idiopathic Parkinson's Disease,Lewy Body Parkinson's Disease,Parkinson Disease, Idiopathic,Parkinson's Disease,Parkinson's Disease, Idiopathic,Parkinson's Disease, Lewy Body,Parkinsonism, Primary
D002626 Chemistry, Pharmaceutical Chemistry dealing with the composition and preparation of agents having PHARMACOLOGIC ACTIONS or diagnostic use. Medicinal Chemistry,Chemistry, Pharmaceutic,Pharmaceutic Chemistry,Pharmaceutical Chemistry,Chemistry, Medicinal
D003198 Computer Simulation Computer-based representation of physical systems and phenomena such as chemical processes. Computational Modeling,Computational Modelling,Computer Models,In silico Modeling,In silico Models,In silico Simulation,Models, Computer,Computerized Models,Computer Model,Computer Simulations,Computerized Model,In silico Model,Model, Computer,Model, Computerized,Model, In silico,Modeling, Computational,Modeling, In silico,Modelling, Computational,Simulation, Computer,Simulation, In silico,Simulations, Computer
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D013329 Structure-Activity Relationship The relationship between the chemical structure of a compound and its biological or pharmacological activity. Compounds are often classed together because they have structural characteristics in common including shape, size, stereochemical arrangement, and distribution of functional groups. Relationship, Structure-Activity,Relationships, Structure-Activity,Structure Activity Relationship,Structure-Activity Relationships
D015394 Molecular Structure The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds. Structure, Molecular,Molecular Structures,Structures, Molecular
D043682 Receptor, Adenosine A1 A subtype of ADENOSINE RECEPTOR that is found expressed in a variety of tissues including the BRAIN and DORSAL HORN NEURONS. The receptor is generally considered to be coupled to the GI, INHIBITORY G-PROTEIN which causes down regulation of CYCLIC AMP. Adenosine A1 Receptors,Adenosine A1 Receptor,Receptors, Adenosine A1
D043683 Receptors, Adenosine A2 A subclass of ADENOSINE RECEPTORS that are generally considered to be coupled to the GS, STIMULATORY G-PROTEIN which causes up regulation of CYCLIC AMP. Adenosine A2 Receptors,Adenosine A2 Receptor,A2 Receptor, Adenosine,A2 Receptors, Adenosine,Receptor, Adenosine A2
D047188 Chalcones Derivatives of CHALCONE that are important intermediates in the formation of FLAVONOIDS with anti-fungal, anti-bacterial, anti-inflammatory, and anti-tumor properties. 1,3-Diphenyl-propanediones,1,3-Diphenyl-propenones,1,3-Diphenylpropanediones,1,3-Diphenylpropenones,Chalconoids,1,3 Diphenyl propanediones,1,3 Diphenyl propenones,1,3 Diphenylpropanediones,1,3 Diphenylpropenones
D058916 Adenosine A1 Receptor Antagonists Compounds that bind to and block the stimulation of ADENOSINE A1 RECEPTORS.

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