Stereoselective Formation of Trisubstituted (<i>Z</i>)-Chloroalkenes Adjacent to a Tertiary Carbon Stereogenic Center by Organocuprate-Mediated Reduction/Alkylation
作者:Tetsuo Narumi、Takuya Kobayakawa、Haruo Aikawa、Shunsuke Seike、Hirokazu Tamamura
DOI:10.1021/ol301988d
日期:2012.9.7
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
描述了一种合成三取代的(Z)-氯代烯烃的稳健而有效的方法。涉及有机杯酸介导的还原/不对称烷基化反应的γ,γ-二氯-α,β-烯丙基阿马酚一锅反应可提供中等至高收率的α-手性(Z)-氯代烯烃衍生物,具有出色的非对映选择性以及内部的烯丙基烷基化还证明了烯丙基宝石-二氯化物。这项研究提供了使用手性中心附近的烯丙基宝石-二氯化物进行新的1,4-不对称诱导的第一个实例。