A novel route to stereodefined cyclopropyl-substituted alkenes

The first Tl2CO3 or Ag2O assisted Suzuki-type cross-coupling of stereodefined cyclopropylboronic acids with haloalkenes without electron-drawing groups to give the corresponding stereodefined cyclopropyl-substituted alkenes in good yields is described. The configurations of both cyclopropyl and alkenyl functions were retained in the reaction.