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    SYNTHESIS OF DELTA-3-CANNABIDIOL AND THE DERIVED RIGID ANALOGS.

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    Author
    NAGARAJA, KODIHALLI NANJAPPA.
    Issue Date
    1987
    Advisor
    Martin, Arnold R.
    
    Metadata
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Synthesis of 2- 1-cyclohexene-5-methyl-2-(1-methyl-ethenyl)-1-yl -1,3-diacetyl-5-(n-pentyl)resorcinol and the related delta-3-cannabidiol analogs, with modification of the terpenoid and/or the aliphatic side chain, were successfully carried out to study the structure anticonvulsant activity relationship. Modifications of the terpenoid skeleton and the sidechain were done by the initial condensation of suitable a β-keto ester with appropriate resorcinol carrying the required side chain to obtain benzpyrones as the starting compounds. Attempts were made to synthesize the conformationally rigid delta-1-cannabidiol (delta-1-CBD) analogs through inter- and intramolecular Diels-Alder strategy. The expected products, ethyl-1-methyl-10-[1-phenyl-2,6-diacetyl-4-(n-pentyl)]-2,3,4,5,6,7,8-octahydro-naphthalene-4-carboxylate and the corresponding stereo- and/or regioisomers were observed to form in trace amounts in presence of Lewis acid catalyst. Cyclization to the corresponding delta-3-THC, in case of diene 55, was a major drawback. The parent dienes 55 and 55A, were seen to decompose and generate high molecular weight products. The diene 55 and 55LA were inert to thermal Diels-Alder reactions. Attempts to obtain the diacrylate of the triol -2-[1-cyclohexene-2-(1-hydroxy-1-methylethyl)-1-yl]-5-(n-pentyl)-resorcinol, to setup the molecule for intramolecular Diels-Alder reaction met with little success. The delta-3-CBD analogs (55, 58, 61, 65, 66, and 67) were submitted for pharmacological activity tests to provide information on the structure-anticonvulsant activity. The anticonvulsant activity was assessed employing the audiogenic seizure (AGS) susceptible rat model of epilepsy and the standard rotorod (ROT) paradigm to evaluate differential neurotoxicity. The results of these tests are encouraging in the n-pentyl analog 55, while the results of analogs 58, 61 with n-pentyl side chain and 65, 66, 67 with dimethylheptyl side chain are awaited.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Pharmaceutical Sciences
    Graduate College
    Degree Grantor
    University of Arizona
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