AbstractWe report herein a Cu‐catalyzed regio‐, diastereo‐ and enantioselective acylboration of 1,3‐butadienylboronate with acyl fluorides. Under the developed conditions, the reactions provide (Z)‐β,γ‐unsaturated ketones bearing an α‐tertiary stereocenter with high Z‐selectivity and excellent enantioselectivities. While direct access to highly enantioenriched E‐isomers was not successful, we showed that such molecules can be synthesized with excellent E‐selectivity and optical purities via Pd‐catalyzed alkene isomerization from the corresponding Z‐isomers. The orthogonal chemical reactivities of the functional groups embedded in the ketone products allow for diverse chemoselective transformations, which provides a valuable platform for further derivatization.
摘要 我们在此报告一种铜催化的 1,3-丁二烯硼酸酯与酰基氟化物的区域、非对映和对映选择性酰基硼化反应。在开发的条件下,这些反应提供了带有 α-叔立体中心的 (Z)-β,γ-不饱和酮,具有很高的 Z 选择性和很好的对映选择性。虽然直接获得高对映富集的 E 异构体并不成功,但我们发现,通过钯催化烯异构化,可以从相应的 Z 异构体合成出具有优异 E 选择性和光学纯度的此类分子。酮产物中嵌入的官能团的正交化学反应活性允许进行多种化学选择性转化,这为进一步衍生提供了宝贵的平台。