Stereoselective Formation of Trisubstituted (Z)‑Chloroalkenes Adjacent to a Tertiary Carbon Stereogenic Center by Organocuprate-Mediated Reduction/Alkylation
journal contributionposted on 07.09.2012, 00:00 by Tetsuo Narumi, Takuya Kobayakawa, Haruo Aikawa, Shunsuke Seike, Hirokazu Tamamura
A robust and efficient method for the synthesis of trisubstituted (Z)-chloroalkenes is described. A one-pot reaction of γ,γ-dichloro-α,β-enoyl sultams involving organocuprate-mediated reduction/asymmetric alkylation affords α-chiral (Z)-chloroalkene derivatives in moderate to high yields with excellent diastereoselectivity, and allylic alkylation of internal allylic gem-dichlorides is also demonstrated. This study provides the first examples of the use of allylic gem-dichlorides adjacent to the chiral center for novel 1,4-asymmetric induction.