Reactions stereoselectives des alkylmagnesiens secondaires avec les anhydrides et lactones rigides

High stereoselectivity was observed in the reactions of secondary alkylmagnesium compounds with bicyclo2.2.1]hept-5-ene-2,3-dicarboxylic anhydride $\text{1}$ and lactone 2 leading respectively to the formation of $\text{trans}$ diastereomeric lactones and $\text{erythro}$ primary-secondary diols.