A cooperative bimetallic catalyst system was applied in the catalytic asymmetric cross-dehydrogenative coupling of β-ketoesters and xanthene. Various optically active xanthene derivatives bearing a quaternary stereogenic carbon center were obtained in moderate to good yields (up to 90%) with excellent enantioselectivities (up to 99% ee). Meanwhile, a transition-state model was proposed to explain the origin of the asymmetric induction.
Iron(iii)–salan complexes catalysed highly enantioselective fluorination and hydroxylation of β-keto esters and N-Boc oxindoles
作者:Xin Gu、Yan Zhang、Zhen-Jiang Xu、Chi-Ming Che
DOI:10.1039/c4cc01631a
日期:——
Chiral iron(III)âsalan complexes catalysed highly enantioselective α-fluorination and α-hydroxylation of β-keto esters and N-Boc oxindoles to give the corresponding products in high yields and good-to-excellent ee values under mild reaction conditions.
Bifunctional Ammonium Salt Catalyzed Asymmetric α-Hydroxylation of β-Ketoesters by Simultaneous Resolution of Oxaziridines
作者:Johanna Novacek、Joseph A. Izzo、Mathew J. Vetticatt、Mario Waser
DOI:10.1002/chem.201604153
日期:2016.11.21
Chiral bifunctional urea‐containing ammonium salts were found to be very efficient catalysts for asymmetric α‐hydroxylation reactions of β‐ketoesters with oxaziridines under base‐free conditions. The reaction is accompanied by a simultaneous kinetic resolution of the oxaziridine and a plausible and so far unprecedented bifunctional transition‐state model has been obtained by means of DFT calculations
Recyclable Hypervalent-Iodine-Mediated Dehydrogenative α,β′-Bifunctionalization of β-Keto Esters Under Metal-Free Conditions
作者:Ya-Nan Duan、Li-Qian Cui、Lin-Hong Zuo、Chi Zhang
DOI:10.1002/chem.201502450
日期:2015.9.7
We have developed a method for recyclable hypervalent‐iodine‐mediated direct dehydrogenativeα,β′‐ bifunctionalization of β‐ketoesters and β‐diketones under metal‐free conditions, which affords a straightforward way to synthesize benzo‐fused 2,3‐dihydrofurans. This efficient, mild method, which has a wide substrate scope and good functional‐group tolerance, was used for the multistep synthesis of the