An optically active vinylic sulfoxide is stereoselectiviely transformed into a chiral cyclopropane by means of a Michael addition reaction with an allyl Grignard reagent, and using this novel cyclopropanation, assmmetric construction of a spiro [4.5] decane is achieved.
T. Imanishi, T. Ohra, K. Sugiyama, Y. Ueda, Y. Takemoto and C. Iwata, J. Chem. Soc., Chem. Commun., 1992, 269 DOI: 10.1039/C39920000269
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