Chemical characteristics of oxindole
alkaloids from URE
Su et al., "Novel oxindole
based sensitizers: synthesis and application in dye-sensitized solar cells," Organic Letters, vol.
However, product 3l, the yield of 5-methyl-3,3-di(indolyl) oxindole
, was excellent (Table 2, entry (12)).
reported an efficient sulfonated hyperbranched poly(arylene oxindole
)s with 5-chloro-substituent group polymer acid catalyst (5-Cl-SHPAOs), and when it was applied for the catalytic conversion of cellulose into LA in [H.sub.2]O, the LA yield was up to 50% at 165[degrees]C for 5h, which was twice as high as unsubstituted SHPAOs (Table 6, entry 5) .
Rhynchophylline is an oxindole
moiety that protects rat neuronal cells from the N-methyl-D-aspartate (NMDA)-induced neurotoxicity .
Nevertheless, other familiar metabolites reported such as indoxyl, oxindole
, anthranilate, salicylate and gentisic acid, and hydroxyindole in similar researches were not observed .
(13.) Stuppner et al., Capillary electrophoretic analysis of oxindole
alkaloids from Un caria tomentosa.
They are divided into indole tetracyclic alkaloids (corynanthein, dihydrocorynanthein,hirsuthein,andhirsutine)oxindole alkaloids (rhynchophylline, isorhynchophylline, corynoxein, isocorynoxein, rotundifolin, and isorotundifolin) indole pentacyclic alkaloids (akuamigine, augustine, augustolin, isoamalicin, and tetrahydroalstonin) and oxindole
alkaloids (speciophylline, mitraphylline, isomitraphylline, pteropodin, isopteropodin, and uncarin F), and glycoindole alkaloids (3a-dihydrocadambine and dolichantosin) (LAUS et al., 1997; FALKIEWICZ & LUKASIAK, 2001; LUNA-PALENCIA et al., 2013).
tomentosa s bark contains a series of secondary metabolites, such as oxindole
alkaloids and polyphenols (flavonoids, proanthocyanidins, tannins) and small concentrations of other secondary metabolites, such as quinovic acid glycosides, polyhydroxylated triterpenes and saponins (Laus, 2004; Aquino et al., 1990, Aquino et al., 1989).
 reported transformation of indole to oxindole
under methanogenic conditions.
alkaloids from Uncaria tomentosa induce apoptosis in proliferating, G0/G1-arrested and bcl-2-expressing acute lymphoblastic leukaemia cells.
Anticancer activity of the Uncaria tomentosa (Willd.) DC preparations with different oxindole