Antioxydant activity of β-carboline derivatives in the LDL oxidation model
摘要:
A series of beta-carboline compounds were synthesized, starting from compound GWC22, their antioxidant activity was determined by inhibition of lipid peroxidation. The oxidation of LDL was induced in the presence of CuSO4 or 2,2'-azobis(2-amidinopropane) dihydrochloride (AAPH). The protective actions of these compounds against the cytotoxicity were evaluated with lactate dehydrogenase (LDH) activity in bovine aortic endothelial cells (BAECs) and cellular vitality by measuring mitochondrial activity in the presence of MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide). Most of compounds showed an higher antioxidant activity than GWC22 derivative (R = 1.6 for 5 mu M CuSO4). The best antioxidant activities are phenolic and benzyloxy derivatives with ratio R = 1.9 to 2.8 for 1 mu M CuSO4. These substances have protective actions and increase significantly the cell viability. (C) 2011 Elsevier Masson SAS. All rights reserved.
<i>N</i>-Methyl-5-<i>tert</i>-butyltryptamine: A Novel, Highly Potent 5-HT<sub>1D</sub> Receptor Agonist
作者:Yao-Chang Xu、John M. Schaus、Clint Walker、Joe Krushinski、Nika Adham、John M. Zgombick、Sidney X. Liang、Dan T. Kohlman、James E. Audia
DOI:10.1021/jm9805945
日期:1999.2.1
one heteroatom (N, O, or S) on the 5-substituent of the indole. This has led to the hypothesis that a 5-substituent capable of participating in hydrogen bonding is critical for conveying high affinity. This article describes the synthesis and biological evaluation of a new series of 5-alkyltryptamine analogues, which does not have a heteroatom in the 5-substituent group. In contrast to the hypothesis
described a mild and easy method, in two steps, by which various benzyl groups were introduced in the C-2 position of tryptamine. The first step consisted on the synthesis of β-carbolines, starting from tryptamine derivatives, by a Pictet–Spengler reaction. Ring-opening of the β-carbolines, by hydrogenation, led to the desired 2-substituted benzyl tryptamine indole products. A supplementary step of alkylation
The invention is concerned with vinylogous acids derivatives of formula (I)
wherein A and R
1
to R
6
are as defined in the description and in the claims, as well as physiologically acceptable salts thereof. These compounds inhibit chymase and can be used as medicaments.
An enantioselectiveintramolecular Pictet–Spengler type annulation of indole-linked 3-methyleneisoindolin-1-ones was developed by using a chiral phosphoric acid as a catalyst. This method enabled the construction of a series of chiral isoindolinone fused tetrahydro β-carbolines in moderate to good yields (up to 97%) with moderate to good enantioselectivities (up to 96% ee). Furthermore, an α1-AR antagonist
An electrosynthesis of spiro-indolenines in batch and continuous flow was achieved through dearomative arylation of indoles with good functional group compatibility. User-friendly undivided cells were used under catalyst- and oxidant-free conditions. Moreover, the use of a flow electrolysis cell gave high daily productivity and excellent scale-up potential under less supporting electrolyte and higher