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Annulated Isoxazoles via [3 + 2] Cycloaddition of Alkenyl Bromides and Oximoyl Chlorides and Ag(I) Promoted Elimination

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journal contribution
posted on 01.08.2014, 00:00 by Emmanuel B. Castillo-Contreras, Alexander M. Stahl, Gregory R. Dake
Substituted salicylaldehydes are converted to fused tetracyclic isoxazoles through a synthetic sequence incorporating substitution of 2-bromo-2-cyclohexen-1-ol, formation of an oxime function, conversion to an oximoyl chloride, intramolecular [3 + 2] cycloaddition, and elimination of an equivalent of hydrogen bromide using silver­(I) carbonate. Six examples of this sequence are presented.

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