Tag: M.W=150-200

Vendrell, Marc published the artcileSolid-phase synthesis of BODIPY dyes and development of an immunoglobulin fluorescent sensor, Name: 6-Chloro-2-fluoro-3-methylbenzaldehyde, the main research area is solid phase synthesis BODIPY dye development Ig fluorescent sensor.

The diversification of the BODIPY scaffold has been hindered by its controversial adaptability to solid-phase chem. Herein the authors report the first solid-phase synthesis of a BODIPY library in high purities. The authors screened the library against a set of proteins, identified an Ig fluorescent sensor (Ig Orange) and confirmed its binding by SPR experiments

Chemical Communications (Cambridge, United Kingdom) published new progress about Affinity. 286474-59-7 belongs to class chlorides-buliding-blocks, name is 6-Chloro-2-fluoro-3-methylbenzaldehyde, and the molecular formula is C8H6ClFO, Name: 6-Chloro-2-fluoro-3-methylbenzaldehyde.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Jacobsen, E. Jon published the artcileHigh-Affinity Partial Agonist Imidazo[1,5-a]quinoxaline Amides, Carbamates, and Ureas at the γ-Aminobutyric Acid A/Benzodiazepine Receptor Complex, Safety of 5-Chloroquinoxalin-2-ol, the main research area is imidazoquinoxaline carbamate carboxamide preparation benzodiazepine receptor; anxiolytic imidazoquinoxaline carbamate carboxamide preparation; cyclopropyl oxadiazolyl imidazoquinoxalinecarboxamide preparation; urea imidazoquinoxaline preparation benzodiazepine receptor.

A series of imidazo[1,5-a]quinoxaline amides, carbamates, and ureas which have high affinity for the γ-aminobutyric acid A/benzodiazepine receptor complex was developed. Compounds within this class have varying efficacies ranging from antagonists to full agonists. However, most analogs were found to be partial agonists as indicated by [35S]TBPS and Cl- current ratios. Many of these compounds were also effective in antagonizing metrazole-induced seizures in accordance with anticonvulsant and possible anxiolytic activity. Selected quinoxalines displayed limited benzodiazepine-type side effects such as ethanol potentiation and phys. dependence in animal models. An interesting analog was 3-(5-cyclopropyl-1,2,4-oxadiazol-3-yl)-N,N-dimethylimidazo[1,5-a]quinoxaline-5(4H)-carboxamide which has a partial agonist profile in vitro while possessing useful activity in animal models of anxiety such as the Vogel and Geller assays. In accordance with its partial agonist profile, 3-(5-cyclopropyl-1,2,4-oxadiazol-3-yl)-N,N-dimethylimidazo[1,5-a]quinoxaline-5(4H)-carboxamide was devoid of typical benzodiazepine side effects.

Journal of Medicinal Chemistry published new progress about Anxiolytics. 55687-19-9 belongs to class chlorides-buliding-blocks, name is 5-Chloroquinoxalin-2-ol, and the molecular formula is C8H5ClN2O, Safety of 5-Chloroquinoxalin-2-ol.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Clarke, Kenneth published the artcileCondensed isothiazoles. Part 5. Thieno[2,3-d]isothiazoles and thien[3,2-d]isothiazoles, Related Products of chlorides-buliding-blocks, the main research area is thienoisothiazole; mercaptothiophenecarbaldoxime cyclization; thiophenecarbaldoxime mercapto cyclization; cyclocondensation mercaptothienyl ketone chloramine; thienooxathiazepine ring contraction thienoisothiazole.

The title compounds were prepared from 2,3-disubstituted thiophenes containing a S function (SH, SMe, or SCN) and a CO group (CHO or Ac). E.g., heating the (E)-mercaptothiophenecarbaldoxime I (R = CO2Et, R1 = H, R2 = CH:NOH, R3 = SH) in DMSO at 170° gave 74% Et thieno[3,2-d]isothiazole-5-carboxylate (II). The (E)-mercaptothiophenecarbaldoxime I (R = Me, R1 = CO2Et, R2 = SH, R3 = CH:NOH) cyclized in boiling AcOH-Ac2O in 5 min to give 79% of the thieno[2,3-d]isothiazolecarboxylate III. Thieno[3,2-d]isothiazoles were also prepared by treating a Me (2-mercapto-3-thienyl) ketone with chloramine and by heating a 2-iminothieno[3,2-d]-3,1,4-oxathiazepine in an inert solvent. The products obtained by selective S-alkylation of 3,5-bis(sodiomercapto)isothiazole-4-carbonitrile with BrCH2CO2Et and MeI were cyclized to give 4-aminothieno[3,2-d or 2,3-c]isothiazoles.

Journal of the Chemical Society, Perkin Transactions 4: Organic and Bio-Organic Chemistry published new progress about Cyclization. 74598-03-1 belongs to class chlorides-buliding-blocks, name is 5-Chloro-4-methylthiophene carboxylic acid, and the molecular formula is C6H5ClO2S, Related Products of chlorides-buliding-blocks.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Roy, Kunal published the artcileQSTR with extended topochemical atom (ETA) indices. 14. QSAR modeling of toxicity of aromatic aldehydes to Tetrahymena pyriformis, Recommanded Product: 6-Chloro-2-fluoro-3-methylbenzaldehyde, the main research area is QSTR extended topochem atom index QSAR model acute toxicity; model acute toxicity aromatic aldehyde Tetrahymena.

Quant. structure-toxicity relationship (QSTR) models were developed in this study using Extended Topochem. Atom (ETA) indexes for a large group of 77 aromatic aldehydes for their acute toxicity against the protozoan ciliate Tetrahymena pyriformis. The ETA models have been compared with those developed using various non-ETA topol. indexes. Attempt was also made to include the n-octanol/water partition coefficient (log Ko/w) as an addnl. descriptor considering the importance of hydrophobicity in toxicity prediction. Thirty different models were developed using different chemometric tools. All the models were validated using internal validation and external validation techniques. The statistical quality of the ETA models was comparable to that of the non-ETA models. The ETA models have shown the important effects of steric bulk, lipophilicity, presence of electroneg. atom containing substituents and functionality of the aldehydic O to the toxicity of the aldehydes. The best ETA model (without using log Ko/w) shows encouraging statistical quality (Qint2 =0.709, Qext2 =0.744). It is interesting to note that some of the topol. models reported here are better in statistical quality than previously reported models using quantum chem. descriptors.

Journal of Hazardous Materials published new progress about Acute toxicity. 286474-59-7 belongs to class chlorides-buliding-blocks, name is 6-Chloro-2-fluoro-3-methylbenzaldehyde, and the molecular formula is C8H6ClFO, Recommanded Product: 6-Chloro-2-fluoro-3-methylbenzaldehyde.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Ni, Nanting published the artcileInhibition of quorum sensing in Vibrio harveyi by boronic acids, COA of Formula: C7H7BClFO2, the main research area is boronate inhibition quorum sensing Vibrio.

Bacterial quorum sensing refers to the ability of bacteria to control gene expression through the detection of a threshold concentration of certain chems. called autoinducer(s), which are secreted by self and/or other bacteria. Quorum sensing is implicated in the regulation of pathol. relevant events such as biofilm formation, virulence, conjugation, sporulation, and swarming mobility. Inhibitors of bacterial quorum sensing are valuable research tools and potential antimicrobial agents. Here, the authors describe the discovery of several boronic acid inhibitors of bacterial quorum sensing in Vibrio harveyi with IC50 values in the low to sub-micromolar range in whole cell assays.

Chemical Biology & Drug Design published new progress about Quorum sensing. 1072952-42-1 belongs to class chlorides-buliding-blocks, name is (5-Chloro-2-fluoro-4-methylphenyl)boronic acid, and the molecular formula is C7H7BClFO2, COA of Formula: C7H7BClFO2.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Huang, Lin published the artcileRapid alkenylation of quinoxalin-2(1H)-ones enabled by the sequential Mannich-type reaction and solar photocatalysis, HPLC of Formula: 55687-19-9, the main research area is dihydroquinoxalinone derivative green preparation diastereoselective; quinoxalinone ketone alkenylation Mannich solar photocatalysis.

A rapid alkenylation of quinoxalin-2(1H)-ones with ketones enabled by a combination of Mannich-type reaction and solar photocatalysis to afford 3,4-dihydroquinoxalin-2(1H)-one derivatives I [R1 = 5-Me, 5-F, 7-tBu, etc.; R2 = Me, Et, Bn, etc.; R3 = Me, Et, 2-furyl, etc.] in moderate-to-good yields was demonstrated. Control experiments illustrated that the in situ generated 1O2 played a central role in this reaction. This green and efficient strategy provided a practical solution for the synthesis of potentially bioactive compounds I that containing a 3,4-dihydroquinoxalin-2(1H)-one structure.

Chinese Chemical Letters published new progress about Alkenylation. 55687-19-9 belongs to class chlorides-buliding-blocks, name is 5-Chloroquinoxalin-2-ol, and the molecular formula is C8H5ClN2O, HPLC of Formula: 55687-19-9.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Hazeldine, Stuart T. published the artcileDesign, Synthesis, and Biological Evaluation of Analogues of the Antitumor Agent, 2-{4-[(7-Chloro-2-quinoxalinyl)oxy]phenoxy}propionic Acid (XK469), Safety of 5-Chloroquinoxalin-2-ol, the main research area is chloroquinoxalinyloxyphenoxypropionic acid structure antitumor; quinoxalinyloxyphenoxypropionic acid antitumor preparation.

2-{4-[(7-Chloro-2-quinoxalinyl)oxy]phenoxy}propionic acid (XK469) I is among the most highly and broadly active antitumor agents to have been evaluated and scheduled to enter clin. trials in 2001. The mechanism or mechanisms of action of I remain to be elaborated. Accordingly, an effort was initiated to establish a pharmacophore hypothesis to delineate the requirements of the active site, via a comprehensive program of synthesis of analogs of I and evaluation of the effects of structural modification(s) on solid tumor activity. The strategy formulated chose to dissect the two-dimensional parent structure into three regions: I, ring A of quinoxaline; II, the hydroquinone connector linkage; and III, the lactic acid moiety-to determine the resultant in vitro and in vivo effects of chem. alterations in each region. Neither the A-ring unsubstituted nor the B-ring 3-chloro-regioisomer of I showed antitumor activity. The modulating antitumor effect(s) of substituents of differing electronegativities, located at the several sites comprising the A-ring of region I, were next ascertained. Thus, a halogen substituent, located at the 7-position of a 2-{4-[(2-quinoxalinyl)oxy]phenoxy}propionic acid, generated the most highly and broadly active antitumor agents. A Me, methoxy, or an azido substituent at this site generated a much less active structure, whereas 5-, 6-, 8-chloro-, 6-, 7-nitro, and 7-amino derivatives all proved to be essentially inactive. When the connector linkage (region II) of I was changed from that of a hydroquinone to either a resorcinol or a catechol derivative, all antitumor activity was lost. Of the carboxylic acid derivatives of I (region III), i.e., CONH2, CONHMe, CONMe2, CONHOH, CONHNH2, CN, or CN4H (tetrazole), only the monomethyl- and N,N-dimethylamides proved to be active.

Journal of Medicinal Chemistry published new progress about Antitumor agents. 55687-19-9 belongs to class chlorides-buliding-blocks, name is 5-Chloroquinoxalin-2-ol, and the molecular formula is C8H5ClN2O, Safety of 5-Chloroquinoxalin-2-ol.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Schultz, Terry W. published the artcileAssessing applicability domains of toxicological QSARs: definition, confidence in predicted values, and the role of mechanisms of action, Formula: C8H6ClFO, the main research area is modeling predictive toxicity QSAR Tetrahymena aromatic compound.

There are many issues relating to the use of Quant. Structure – Activity Relationships (QSARs) to make predictions for regulatory purposes. Among those issues, characterization of models and the development of suitable tools to determine applicability domains rank as the more important. With regard to aquatic toxicol., QSARs for acute effects (e.g., IGC50-1) often take the form of a hydrophobic [i.e., Logarithm of the 1-Octanol/Water Partition Coefficient (log P)]-electrophilic [e.g., Maximum Acceptor Superdelocalizability (Amax)]-dependent, regression-based model. In this study, the applicability domain of a model for the toxicity of aromatic compounds to Tetrahymena pyriformis [log (IGC50-1) = 0.545(0.015) log P + 16.2(0.62) Amax-5.91(0.20); n = 384, r2 (adj) = 0.859, r2(pred) = 0.856, s = 0.275, F = 1163, Pr > F = 0.0001] was assessed. The structural and physicochem. domains of the model were characterized using two test sets of toxicity data (one prescreened to be within the descriptor space and structural domain of the training set and the other to be outside the structural domain of the training set). For test set compounds inside the domain of the model, there was no relationship between absolute residue values for predictions and hydrophobicity; however, there was a linear relationship between absolute residue values and electrophilicity. It was concluded that predictivity in the region of the domain associated with higher electrophilicity, greater potency, and derivatives containing both halo- and nitro-groups is poorer than elsewhere in the domain, and therefore less confidence should be given to those values. Compounds in this region of the domain of the model are associated with the soft-, or pro-electrophilic mechanisms of toxic action. For the second test set, i.e., derivatives outside the structural domain, an examination of absolute residue values revealed that the observed toxicity is typically in excess of that predicted, especially for compounds in the structural space(s) of well-known electrophilic mechanisms of reactive toxicity. Caution is therefore urged in using statistical approaches to account for, and apply confidence to predictions from the applicability domain. An appreciation of the mechanism of toxicity appears to be critical to the determination of the most likely applicability domain.

QSAR & Combinatorial Science published new progress about Aquatic toxicity. 286474-59-7 belongs to class chlorides-buliding-blocks, name is 6-Chloro-2-fluoro-3-methylbenzaldehyde, and the molecular formula is C8H6ClFO, Formula: C8H6ClFO.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Lei, Beilei published the artcileAccurate prediction of aquatic toxicity of aromatic compounds based on genetic algorithm and least squares support vector machines, Application In Synthesis of 286474-59-7, the main research area is aquatic toxicity aromatic compound genetic algorithm statistics.

Quant. Structure – Toxicity Relationship (QSTR) plays an important role in ecotoxicol. for its fast and practical ability to assess the potential neg. effects of chems. The aim of this investigation was to develop accurate QSTR models for the aquatic toxicity of a large set of aromatic compounds through the combination of Least Squares Support Vector Machines (LS-SVMs) and a Genetic Algorithm (GA). Mol. descriptors calculated by DRAGON package and log P were used to describe the mol. structures. The most relevant descriptors used to build QSTR models were selected by a GA-Variable Subset Selection procedure. Multiple Linear Regression (MLR) and nonlinear LS-SVMs methods were employed to build QSTR models. The predictive ability of the derived models was validated using both the test set, selected from the whole data set by the Kennard – Stone Algorithm, and an external prediction set. The model applicability domain was checked by the leverage approach and the external prediction set was used to verify the predictive reliability of the models. The results indicated that the proposed QSTR models are robust and satisfactory, and can provide a feasible and promising tool for the rapid assessment of the toxicity of chems.

QSAR & Combinatorial Science published new progress about Aquatic toxicity. 286474-59-7 belongs to class chlorides-buliding-blocks, name is 6-Chloro-2-fluoro-3-methylbenzaldehyde, and the molecular formula is C8H6ClFO, Application In Synthesis of 286474-59-7.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Netzeva, Tatiana I. published the artcileQSARs for the aquatic toxicity of aromatic aldehydes from Tetrahymena data, Recommanded Product: 6-Chloro-2-fluoro-3-methylbenzaldehyde, the main research area is aldehyde lipophilicity electrophlicity structure aquatic toxicity.

The aim of the study was to develop quant. structure-activity relationships (QSARs) for a large group of 77 aromatic aldehydes tested for acute toxicity to the ciliate Tetrahymena pyriformis using mechanistically interpretable descriptors. The resulting QSARs revealed that the 1-octanol/water partition coefficient (log Kow), is the most important descriptor of aldehyde aquatic toxic potency. The model with log Kow was improved by adding electronic descriptor (the maximum acceptor superdelocalizability in a mol.-Amax) based on calculations with the semi-empirical AM1 model. The 2 descriptors reflect the 2 main processes responsible for demonstration of acute aquatic toxicity, namely penetration through cell membranes (log K ow) and interaction with the biomacromols. (Amax) into the cells. Results showed that generally the studied group of aldehydes could be modeled by this simple 2-descriptor approach. However, the group of 2- and/or 4-hydroxylated aldehydes demonstrates enhanced toxicity compared to the other aldehydes. Transformation to quinone-like structures is proposed as the explanation for this enhanced potency. The 2- and/or 4-hydroxylated aldehydes are modeled successfully by [log(1/IGC50) = 0.540(0.038) log Kow + 8.30(2.88)Amax – 3.11(0.92), n = 25, R2 = 0.916, R2CV = 0.896 , s = 0.141, F = 120], while the other aldehydes are modeled by the relationship [log(1/IGC50) = 0.583 (0.034)log Kow + 9.80(2.62)Amax – 4.04 (0.85), n = 52, R2 = 0.864, R2CV = 0.844, s = 0.203, F = 156], which is similar to the general benzene model.

Chemosphere published new progress about Aquatic toxicity. 286474-59-7 belongs to class chlorides-buliding-blocks, name is 6-Chloro-2-fluoro-3-methylbenzaldehyde, and the molecular formula is C8H6ClFO, Recommanded Product: 6-Chloro-2-fluoro-3-methylbenzaldehyde.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics