3-chloromethylene-6-fluorothiochroman-4-one, A novel DNA Topoisomerase poison

3-Chloromethylene-6-fluorothiochroman-4-one [CMFT] is a novel thiochromanones derivative that has better anti-tumor activity. In this paper, we will compare the antitumor activity of the cis-trans isomers, and explore their inhibiting effects on human topoisomerase I and topoisomerase II in cell free reaction system. The MTT method was used to study inhibition rates; the AO/EB double staining and TUNEL assay was used to assess proportion of apoptotic cells. The inhibition of CMFT to Topo I and II could be identified by adding CMFT solutions to Topo-DNA reaction mixtures and observing the relative quantities of relaxed strands and supercoils in electrophoresis assay. Results showed that CMFT had dramatic anti-tumor activities at low concentrations and the activity of CMFT trans-isomer is more significant. Use of AO/EB double staining and TUNEL indicated that CMFT induces apoptosis. DNA relaxation assays and DNA cleavage and relegation assays were performed and showed a higher potential to interact with topoisomerase I [Topo I] and topoisomerase II [Topo II] and it was verified that CMFT is a Topo poison which could be one of the mechanisms that induce cell apoptosis. Our results provide preliminary data for further investigation for the mechanism of CMFT of the apoptotic mechanism

Design, synthesis and evaluation of new L-proline derivatives as acetylcholinesterase inhibitors / 药学学报

In this paper, fourteen new L-proline derivatives were designed and synthesized, and their acetlcholinesterase (AChE) inhibitory activities were also investigated in vitro. New L-proline derivatives were prepared from substituted 2-bromo-1-acetophenones through four-step reaction; and their bioactivities as AChE inhibitors were measured by Ellman spectrophotometry. The results showed that the target compounds had a certain AChE inhibitory activity to in vitro. The bioactivity of compound 8b was the best of them, and its IC50 value was 5.45 µmol.L-1, which was better than that of rivastigmine. So the acetylcholinesterase inhibitory activities of new L-proline derivatives were worth to be further studied.

Design, synthesis and evaluation of 5-aminobenzimidazolone derivatives as acetylcholinesterase inhibitors / 药学学报

The target compounds were prepared from 5-aminobenzimidazolone by two steps reaction, and their AChE inhibitory activities were measured by Ellman method in vitro. The AChE inhibitory activity of compound 4d is the best of them, and its IC50 value is equal to 7.2 μmol·L(-1), which is better than that of rivastigmine; moreover the 4d had no inhibitory activities to BuChE. Therefore, the inhibitory activities of 5-aminobenzimidazolone derivatives to acetylcholinesterase are worth further researching.

Design, synthesis and evaluation of N-acyl-4-phenylthiazole-2-amines as acetylcholinesterase inhibitors / 药学学报

N-Acyl-4-phenylthiazole-2-amines were designed and synthesized, moreover their effects on acetylcholinesterase activities were tested. N-Acyl-4-phenylthiazole-2-amines were prepared from substituted 2-bromo-1-acetophenones by three steps reaction, and their AChE inhibitory activities were measured by Ellman method in vitro. The results showed that the target compounds had a certain inhibitory activity on AChE in vitro. Among them, 8c was the best, and IC50 of 8c was 0.51 micromol x L(-1), better than that of rivastigmine and Huperzine-A. The inhibitory activities of N-acyl-4-phenylthiazole-2-amines on acetylcholinesterase are worth while to be further studied.

Design, synthesis and evaluation of new acetylcholinesterase inhibitors / 药学学报

A series of novel 2-amino-4-phenylthiazole derivatives were designed and synthesized, furthermore, their inhibition effect on acetylcholinesterase were investigated. 2-Amino-4-phenylthiazoles were prepared from alpha-bromoacetophenones by Hantzsch reaction, acylation reaction and substitution reaction. Moreover, their bioactivities as AChE inhibitors in vitro were measured with Ellman spectrophotometry. The results showed that most of them had a certain inhibition activity on AChE, and the compound 8a was the best of them. The IC50 of 8a to AChE is 3.54 micromol x L(-1), and the value was better than that of rivastigmine. 2-Amino-4-phenylthiazole derivatives showed a certain bioactivity in vitro, which were worth further investigation.

Design, synthesis and activity of N-acyl-thiochromenothiazol-2-amine as acetylcholinesterase inhibitors / 药学学报

A series of novel N-acyl-thiochromenothiazol-2-amine derivatives were designed and synthesized, furthermore, their inhibition effect on acetylcholinesterase was investigated. N-Acyl-thiochromenothiazol-2-amines were prepared from thiophenol by Hantzsch reaction, acylation reaction and substitution reaction. Moreover, their bioactivities as AChE inhibitors in vitro were measured with Ellman spectrophotometry. The results showed that most of them had a certain inhibition activity on AChE, and the compound 10a was the best in them. The IC50 of 10a to AChE is 7.92 μmol x L(-1), and the value is better than that of rivastigmine. N-Acyl-thiochromenothiazol-2-amine derivatives showed a certain bioactivity in vitro, which were worth further investigation.