Catalytic, Enantioselective α‐Alkylation of Azlactones with Nonconjugated Alkenes by Directed Nucleopalladation
作者:Sri Krishna Nimmagadda、Mingyu Liu、Malkanthi K. Karunananda、De‐Wei Gao、Omar Apolinar、Jason S. Chen、Peng Liu、Keary M. Engle
DOI:10.1002/anie.201814272
日期:2019.3.18
palladium(II)‐catalyzed enantioselective α‐alkylation of azlactones with nonconjugated alkenes is described. The reaction employs a chiral BINOL‐derived phosphoric acid as the source of stereoinduction, and a cleavable bidentate directing group appended to the alkene to control the regioselectivity and stabilize the nucleopalladated alkylpalladium(II) intermediate in the catalytic cycle. A wide range of
描述了钯(II)催化的内酯与非共轭烯烃的对映选择性α-烷基化。该反应使用手性BINOL衍生的磷酸作为立体诱导的来源,并且在烯烃上附加了可裂解的双齿导向基团,以控制区域选择性并稳定催化循环中的核钯烷基钯(II)中间体。人们发现,在最佳反应条件下,各种各样的内酯都具有相容性,从而能够以高收率和高对映选择性提供带有α,α-二取代的α-氨基酸衍生物的产物。