Deconstructing cytisine: The syntheses of (+/-)-cyfusine and (+/-)-cyclopropylcyfusine, fused ring analogs of cytisine |
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Authors: | Yohannes Daniel Procko Kristen Lebel Lorraine A Fox Carol B O'Neill Brian T |
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Institution: | Pfizer Global Research and Development, Groton Laboratories, Eastern Point Road, Groton, CT 06340, USA. daniel.yohannes@targacept.com |
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Abstract: | A novel fused tricyclic analog (11) of cytisine has been prepared (coined 'cyfusine') and determined to have high affinity at neuronal nicotinic acetylcholine receptors. A 3+2] cycloaddition protocol permitted entry into a 3,4-differentially difunctionalized dihydropyrrole (7). The penultimate cyclization was accomplished using the modified Van Tamelen conditions developed in our earlier synthesis of (+/-)-cytisine. Sequential ring-forming reactions (3+2] cycloaddition/cyclopropanation/pyridone cyclization) gives a unique cyclopropyl analog (16) possessing a skeleton isoatomic with that of cytisine. |
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