作者:Kenichi Michigami、Tsuyoshi Mita、Yoshihiro Sato
DOI:10.1021/jacs.7b02775
日期:2017.5.3
tolerability, so that selective addition to CO2 occurred in the presence of other carbonyl groups such as amide, ester, and ketone. Since styrylacetic acid derivatives can be readily converted into optically active γ-butyrolactones through Sharpless asymmetric dihydroxylation, this allylic C(sp3)-H carboxylation showcases a facile synthesis of γ-butyrolactones from simple allylarenes via short steps.
借助 Co/Xantphos 复合物开发了末端烯烃的烯丙基 C(sp3)-H 键与 CO2 的催化羧化。广泛的烯丙基芳烃和 1,4-二烯以中等至高产率成功转化为线性苯乙烯乙酸和六-3,5-二烯酸衍生物,并具有出色的区域选择性。羧化显示出显着的官能团耐受性,因此在其他羰基(如酰胺、酯和酮)存在的情况下,会发生选择性加成到 CO2 中。由于苯乙烯乙酸衍生物可以通过 Sharpless 不对称二羟基化很容易地转化为光学活性的 γ-丁内酯,这种烯丙基 C(sp3)-H 羧化展示了从简单的烯丙基芳烃通过短步骤轻松合成 γ-丁内酯。