Intramolecular Direct Dehydrohalide Coupling Promoted by KOtBu: Total Synthesis of Amaryllidaceae Alkaloids Anhydrolycorinone and Oxoassoanine
- 14 August 2012
- journal article
- letter
- Published by American Chemical Society (ACS) in Organic Letters
- Vol. 14 (17), 4466-4469
- https://doi.org/10.1021/ol3019677
Abstract
A transition-metal-free intramolecular dehydrohalide coupling via intramolecular homolytic aromatic substitution (HAS) with aryl radicals has been developed in the presence of potassium tert-butoxide and an organic molecule as the catalyst. The methodology has been applied to a concise synthesis of Amaryllidaceae alkaloids viz. oxoassoanine (1b), anhydrolycorinone (1d), and other related structures. Interestingly, the method also works only in the presence of potassium tert-butoxide.Keywords
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