Several β-carbolines including naturally occurring substances and their corresponding cationic derivatives were synthesized and evaluated for antimalarial (antiplasmodial) activity in vitro and in vivo. A tetracyclic carbolinium salt was elucidated for antileishmanial and antitrypanosomal activities in vitro as well as antiplasmodial activity. Quarternary carbolinium cations showed much higher potencies in vitro than electronically neutral β-carbolines and a good correlation was observed between π-delocalized lipophilic cationic (DLC) structure and antimalarial efficacy. β-Carbolinium compounds exhibit medium suppressive activity in vivo against rodent malaria.
Loss of THCCOOH from Urine Specimens Stored in Polypropylene and Polyethylene Containers at Different Temperatures
作者:P. R. Stout、C. K. Horn、D. R. Lesser
DOI:10.1093/jat/24.7.567
日期:2000.10.1
The loss of Δ9-tetrahydrocannabinol (THCCOOH) from urine specimens stored in polypropylene and polyethylene containers at 4°C and 25°C was examined. All specimens were analyzed by GC-MS after sampling at various times over a one-week period. Data were analyzed by one-way analysis of variance and fitted with a first order kinetic equation. Rapid loss of THCCOOH was seen at 4°C for both polypropylene (14% maximal loss, t½ = 0.53 min) and polyethylene (17% maximal loss, t½ = 5.77 min) bottles. At 25°C, a small loss (< 5%) was observed in polypropylene and no significant loss was seen for urine in polyethylene. All losses stabilized within 1 h, and no further losses were seen over one week. The results indicate that THCCOOH binding may be due to decreased solubility of THCCOOH at lower temperatures and subsequent association of THCCOOH with the more lipophilic plastic. The results also indicate that polypropylene and polyethylene do not bind THCCOOH to such an extent as to compromise the integrity of specimens.
Selective oxidation of canthines to canthin-6-ones with triethylbenzylammonium permanganate
作者:Jia-He Li、John K. Snyder
DOI:10.1016/s0040-4039(00)76738-4
日期:1994.3
Oxidation of canthines, prepared from intramolecular inverse electron demand Diels-Alder reactions of indole with tethered triazines, produced the corresponding canthin-6-ones regiospecifically, with no detected canthin-4-ones.
A total synthesis of naturally occurring 1-methoxycanthin-6-one is described. In this synthesis, we achieved one-pot conversion from β-carboline-1-carbaldehyde to the canthin-6-one skeleton by the sequential addition of lithium ketene acetal in LiHMDS solution followed by the addition of EtOH in the reaction mixture.
USE OF CANTHIN-6-ONE AND ITS ANALOGS IN THE TREATMENT OF MYCOBACTERIA-LINKED PATHOLOGIES ( amended
申请人:Fournet Alain Robert Francois Maxime
公开号:US20110059977A1
公开(公告)日:2011-03-10
The present invention relates to the use, for the preparation of a medicament intended for the treatment or the prevention of pathologies linked to, or caused by mycobacteria, of at least one of the compounds of the following formula (I): in which B represents in particular a nitrogen atom, and R1, R2, R3, R4, R5, R6, R7 and R8 represent in particular a hydrogen atom.