Abstract
Ethenylmagnesium bromide (1.5 equiv) forms a chelate with (−)-1-{(1S,2R,4R)-1-ethenyl-2-hydroxy-7,7-dimethylbicyclo[2.2.1]hept-2-yl} ethanone in THF and promotes its fast primary α-ketol rearrangement into 1-ethenyl-2-hydroxy-2,8,8-trimethylbicyclo[3.2.1]octan-3-one. The latter reacts with excess magnesium reagent (0.5 equiv) according to common 1,2-addition pattern at the carbonyl group and is simultaneously involved in the second α-ketol rearrangement which leads to 1-ethenyl-3-hydroxy-3,8,8-trimethylbicyclo[3.2.1]octan-2-one as thermodynamically more stable regioisomer.
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Original Russian Text © N.S. Vostrikov, V.Z. Vasikov, M.S. Miftakhov, 2006, published in Zhurnal Organicheskoi Khimii, 2006, Vol. 42, No. 7, pp. 982–985.
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Vostrikov, N.S., Vasikov, V.Z. & Miftakhov, M.S. Specificity of the reaction of (−)-1-{(1S,2R,4R)-1-ethenyl-2-hydroxy-7,7-dimethylbicyclo[2.2.1]hept-2-yl}xethanone with ethenylmagnesium bromide. Russ J Org Chem 42, 962–965 (2006). https://doi.org/10.1134/S1070428006070050
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DOI: https://doi.org/10.1134/S1070428006070050