In general, enantioselective C–H functionalization of N-monosubstituted anilines is a highly challenging task owing to the competitive chemoselective N–H bond insertion reactions. In this paper, we reported a direct highly chemo-, site-, and enantioselective para C–H aminoalkylation of N-monosubstituted anilinederivatives with isatin-derived ketimines in the presence of chiral phosphoric acids (CPAs)
Aza-Henry Reaction of Isatin Ketimines with Methyl 4-Nitrobutyrate en Route to Spiro[piperidine-3,3′-oxindoles]
作者:Melireth Holmquist、Gonzalo Blay、M. Carmen Muñoz、José R. Pedro
DOI:10.1002/adsc.201500716
日期:2015.12.14
enantioselective route to spiro[piperidine-3,3′-oxindoles] from isatinketimines is described. The aza-Henryreaction of N-Boc-isatin ketimines with methyl4-nitrobutyrate in the presence of a Ph2BOX-CuBr2 complex provided the corresponding nitro amino esters with good diastereoselectivity and excellent enantioselectivity (up to >99% ee). The aza-Henry adducts were transformed into spiro[piperidine-3,3′-oxindoles]
Organocatalytic enantioselective construction of isatin-derived N-alkoxycarbonyl 1,3-aminonaphthols via sterically encumbered hydrocarbon-substituted quinine-based squaramide
作者:Seda Karahan、Cihangir Tanyeli
DOI:10.1039/c7nj01395g
日期:——
Herein, an illustrative example to synthesize chiral naphthoxazepine precursors via the aza-Friedel–Crafts reaction of N-alkoxycarbonyl isatin ketimines with naphthol using a new 2-adamantyl-substituted quinine-derived squaramidecatalyst is presented; the reaction afforded the chiral-tetrasubstituted 3-amino-2-oxindoles with excellent enantioselectivity of greater than 99% ee and quantitative yields
Asymmetric organocatalytic direct Mannich reaction of acetylacetone and isatin derived ketimines: Low catalyst loading in chiral cinchona-squaramides
作者:Duygu İşibol、Seda Karahan、Cihangir Tanyeli
DOI:10.1016/j.tetlet.2017.12.081
日期:2018.2
A highly enantioselective synthesis of 3-amino-2-oxindoles by directMannichreaction between acetylacetone and N-carbamoyl isatin ketimine has been described herein. Corresponding chiral adducts were obtained in high yields (up to 98%) and with excellent enantioselectivities (up to >99% ee) by very low (1 mol%) catalyst loading of 2-adamantyl substituted bifunctional cinchona-squaramide.
Chiral Phosphoric Acid-Catalyzed Enantioselective Aza-Friedel–Crafts Addition of Naphthols with Isatin-Derived Ketimines
作者:Mei Duan、Jingchao Chen、Ting Wang、Shaojian Luo、Meifen Wang、Baomin Fan
DOI:10.1021/acs.joc.2c01659
日期:2022.11.18
The enantioselective Friedel–Crafts addition of naphthols with isatin-derived ketimines was developed with H8-BINOL-derived chiral biaryl phosphoric acid. A wide range of isatin-derived ketimines and naphthols were successfully applied and gave a series of chiral 3-amino-2-oxindoles in excellent yields with high optical purities.
萘酚与靛红衍生的酮亚胺的对映选择性 Friedel-Crafts 加成是用 H 8 -BINOL 衍生的手性联芳基磷酸开发的。广泛的靛红衍生物酮亚胺和萘酚被成功应用,并以优异的产率和高光学纯度得到一系列手性 3-氨基-2-羟吲哚。