Cyclopropanation via conjugate addition

This stabilized ylide reacts with aldehydes and ketones to furnish epoxides. The difference in reactivity between dimethylsulfonium methylide and dimethyloxosulfo-nium methylide is apparent when considering their reactions with a, 3-unsaturated ketones. Whereas the nonstabilized ylide yields the epoxide, the stabilized ylide affords a cyclopropane via conjugate addition followed by ring closure and loss of dimethyl sulfoxide. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ , ]

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