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Expedient Construction of the Vibsanin E Core without the Use of Protecting Groups

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journal contribution
posted on 31.03.2005, 00:00 by Ralf Heim, Stefan Wiedemann, Craig M. Williams, Paul V. Bernhardt
The tricyclic core of vibsanin E was constructed without the use of a protecting group in six steps. The El Gaïed Baylis−Hillman variant was key to allowing the Brønsted acid induced tandem cyclization forming rings B and C in one operation.