Stereochemistry of the organocuprate reactions of two cis–trans isomeric allylic ethers
Abstract
(S)-cis-4-(1-Ethoxyethoxy)pent-2-en-1-ol reacts with methylmagnesium iodide in the presence of CuI to give (S)-2-methylpent-3-en-1-ol in an overall trans substitution, whereas (S)-trans-4-(1-ethoxyethoxy)pent-2-en-1-ol gives rise to the (R)-enantiomer, also in a trans substitution.