A cinchona alkaloid catalyzed enantioselective sulfa-Michael/aldol cascade reaction of isoindigos: construction of chiral bispirooxindole tetrahydrothiophenes with vicinal quaternary spirocenters
作者:Yong-Yuan Gui、Jian Yang、Liang-Wen Qi、Xiao Wang、Fang Tian、Xiao-Nian Li、Lin Peng、Li-Xin Wang
DOI:10.1039/c5ob00774g
日期:——
Enantioselective sulfa-Michael/aldol reaction of isoindigos has been successfully developed to afford bispirooxindole tetrahydrothiophenes with vicinal quaternary spirocenters.
7-SUBSTITUTED INDIRUBIN-3'OXIMES AND THEIR APPLICATIONS
申请人:Meijer Laurent
公开号:US20100331327A1
公开(公告)日:2010-12-30
The invention relates to new 3′-, 7-substituted-indirubins of formula (I) wherein R represents N—OH, N—O-alkyl or N—O—CO-alkyl, NO—(R
a
)
n1
-Het, N—O—(Y)
n1
—NR
a
R
b
, N—O—CO—N(R
b
R
c
), radical with Het representing an aliphatic nitrogeneous heterocycle, Y being an optionally substituted —CH
2
— radical, n1 being 1 to 3, and X is an halogen atom selected in the group comprising F, Cl, Br, I, and Z is H or CH
3
and the salts thereof.
该发明涉及公式(I)中的新3'-,7-取代吲哚素,其中R代表N—OH,N—O-烷基或N—O—CO-烷基,NO—(R
a
)
n1
-Het,N—O—(Y)
n1
—NR
a
R
b
,N—O—CO—N(R
b
R
c
),基团Het代表脂肪族氮杂环,Y为可选择取代的—CH
2
—基团,n1为1至3,X为在F、Cl、Br、I组成的卤素原子中选择的一个,Z为H或CH
3
及其盐。
Palladium(II)/N-Heterocyclic Carbene Catalyzed One-Pot Sequential α-Arylation/Alkylation: Access to 3,3-Disubstituted Oxindoles
designed fluorene-based mono- and bimetallic Pd–PEPPSI complexes were synthesized and demonstrated to be effective for the one-pot sequential α-arylation/alkylation of oxindoles. This streamlined approach offers efficient access to functionalized 3,3-disubstitutedoxindoles in excellent yields (up to 89%) under mild reaction conditions.
Process for preparing isatins with control of side-product formation
申请人:Wilk Kazimierz Bogdan
公开号:US20060247442A1
公开(公告)日:2006-11-02
Methods and kits for preventing or minimizing the formation of isatin oximes during formation of an isatin from an isonitrosoacetanilide are provided. Also provided are methods and kits for preventing or minimizing the formation of isatin oxime impurities after formation of an isatin from an isonitrosoacetanilide by using a decoy agent in the quenching and/or extraction steps. The isatins can be prepared using a decoy agent and desirably a strong acid. Further provided are methods for preparing isatin oximes.