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Alternative Sm(II) Species-Mediated Cascade Coupling/Cyclization for the Synthesis of Oxobicyclo[3.1.0]hexane-1-ols.

The allylSmBr/HMPA/MsOH system has been found to be an efficient reagent for the "ester-alkene" coupling/cyclization cascade of readily available α-allyloxy esters. Oxobicyclo[3.1.0]hexane-1-ols were thus prepared in good to excellent yields and diastereoselectivities. Investigation on the mechanism suggested the possible existence of a new Sm(II) species, namely, CH3SO3SmBr, which resulted from the reaction between allylSmBr and MsOH and may be the actual SET reagent.