FACILE PREPARATION OF γ-CHLORO-SUBSTITUTED ALLYLMETALLIC REAGENTS AND THEIR REACTIONS. STEREOSELECTIVE ACCESS TO CIS-VINYLOXIRANES

The title compounds are readily prepared from metallated allyl chloride and organotin chloride or organoaluminum chloride. After treatment with a base, they react with aldehydes in highly regio-and diastereo-selective modes, giving cis-vinyloxiranes selectively.