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 |
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Authors: | N S Vostrikov V Z Vasikov M S Miftakhov |
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Institution: | (1) Institute of Organic Chemistry, Ufa Research Center, Russian Academy of Sciences, pr. Oktyabrya 71, Ufa, 450054, Bashkortostan, Russia |
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Abstract: | Ethenylmagnesium bromide (1.5 equiv) forms a chelate with (?)-1-{(1S,2R,4R)-1-ethenyl-2-hydroxy-7,7-dimethylbicyclo2.2.1]hept-2-yl} ethanone in THF and promotes its fast primary α-ketol rearrangement into 1-ethenyl-2-hydroxy-2,8,8-trimethylbicyclo3.2.1]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-trimethylbicyclo3.2.1]octan-2-one as thermodynamically more stable regioisomer. |
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