The enantioselective synthesis of the potent dopamine D1 agonist (1R,3S)-3-(1'-adamantyl)-1-(aminomethyl)-3,4-dihydro-5,6-dihydroxy-1H-2-benzopyran (A77636)
作者:Michael P. DeNinno、Richard J. Perner、Howard E. Morton、Stanley DiDomenico
DOI:10.1021/jo00052a025
日期:1992.12
The synthesis of both enantiomers of the title compound is described. The corresponding racemic compound (+/-)-1 was previously shown to be a highly potent and selective dopamine Dl agonist. Key to the synthesis of the enantiomers was the oxazaborolidine-catalyzed asymmetric reduction of the alpha-bromomethyl ketone 12 which led to the optically enriched epoxide 7. An aryllithium addition to the epoxide followed by a diastereospecific cyclization to the isochroman system furnished compound 17, which was deprotected to afford (-)-1 with >99.5% optical purity.