Synthesis of fluorinated analogues of the neurosteroid GABAA receptor antagonist, 17-PA (cas 694438-95-4)

Add time:07/13/2019    Source:sciencedirect.com

The steroid 17-PA is a GABAA receptor antagonist which is finding use as a tool in evaluating agonistic/antagonistic activity at GABAA receptors. Compounds with improved efficacy over 17-PA would be are advantageous for such studies. Accordingly a series of novel analogues of the neurosteroid 17-PA have been prepared and a convenient two-step route is presented which is amenable to the synthesis of analogues with electron-donating para-aromatic substituents including fluorine. However, for the meta-fluoro analogue then the original four-step route to 17-PA remains more efficient overall. The paper describes these syntheses and discusses the electronic factors which influence this synthetic chemistry.

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