Synthesis and biological activity of some 1,3,2-diheteraphosphorinanes and their acyclic analogs

Methods were developed for the synthesis of 2-butylthio-2-oxo-1,3,2-oxazaphosphorinane, 2-butylthio-2-thioxo-1,3,2-dioxaphosphorinane, and 2-butylthio-2-thioxo-1,3,2-diazaphosphorinane, as well as of acyclicS-butylO-ethyl (diethylamido)phosphorothioates and-dithioates andS-butyl bis(diethylamido)phosphorodithioate. These compounds can serve as models of possible metabolites of cyclic compounds. Based on the data obtained in studies of the antiesterase activity of the resulting compounds and their synergistic activity in mixtures with permethrine, a possible mechanism ofin vitro andin vivo biological action of diheteraphosphorinanes was proposed.     

Synthesis and biological activity of mycalolide analogs

Mycalolide analog 4, consisting only of the side chain of mycalolide B (2), a trisoxazole macrolide of marine origin, was stereoselectively synthesized using Roush crotylboration, an Evans aldol reaction, and a Paterson aldol reaction as key steps. The analog 4 was found to have strong actin-depolymerizing activity.     

Synthesis and biological evaluation of neopeltolide and analogs

The synthesis of neopeltolide analogues that contain variations in the oxazole-containing side chain and in the macrolide core are reported along with the GI(50) values for these compounds against MCF-7, HCT-116, and p53 knockout HCT-116 cell lines. Although biological activity is sensitive to changes in the macrocycle and the side chain, several analogues displayed GI(50) values of <25 nM. Neopeltolide and several of the more potent analogues were significantly less potent against p53 knockout cells, suggesting that p53 plays an auxiliary role in the activity of these compounds.     

Synthesis of benzofuran derivatives via rearrangement and their inhibitory activity on acetylcholinesterase

During a synthesis of coumarins to obtain new candidates for treating Alzheimer's Disease (AD), an unusual rearrangement of a benzopyran group to a benzofuran group occurred, offering a novel synthesis pathway of these benzofuran derivatives. The possible mechanism of the novel rearrangement was also discussed. All of the benzofuran derivatives have weak anti-AChE activities compared with the reference compound, donepezil.     

Synthesis and biological evaluation of aziridine-containing analogs of phytosphingosine

Six new aziridine-containing analogs of phytosphingosine designed as constrained anhydrophytosphingosine were synthesized. The synthetic route developed also afforded an access to an original bicyclic analog of the natural anhydrophytosphingosine jaspine B. All these new compounds were evaluated for their capacities to affect melanoma cell viability.     

Synthesis and biological evaluation of thiophene derivatives as acetylcholinesterase inhibitors

A series of new thiophene derivatives has been synthesized using the Gewald protocol. The acetylcholinesterase inhibition activity was assayed according to Ellman's method using donepezil as reference. Some of the compounds were found to be more potent inhibitors than the reference. 2-(2-(4-(4-Methoxyphenyl)piperazin-1-yl)acetamido)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxamide (IIId) showed 60% inhibition, compared to only 40% inhibition by donepezil.     

三芥子酸甘油酯类似物的合成及抑菌活性

以N-(2-溴乙基)邻苯二甲酰亚胺或N-(4-溴丁基)邻苯二甲酰亚胺和硫氢化钠为起始原料,通过取代、肼解、亲核加成等反应合成了10个三芥子酸甘油酯(erucin)类似物,通过核磁共振氢谱、碳谱及质谱对其结构进行了确认。采用比浊法初步测试了其对大肠杆菌、金黄色葡萄球菌、白色葡萄球菌、藤黄八叠球菌、枯草芽孢杆菌、蜡状芽孢杆菌和四联球菌等7种菌的生长抑制活性,测试结果显示,化合物对测试菌种都表现出较好的生长抑制活性,其中苄硫乙基-1-硫代异硫氰酸酯(5e)和苄硫基丁基-1-硫代异硫氰酸酯(5j)活性最高,对大肠杆菌的最低生长抑制浓度仅为7.8μg/m L,对金黄色葡萄球菌的最低生长抑制浓度也仅为15.6μg/m L和31.2μg/m L。     

Synthesis and biological evaluation of SGLT2 inhibitors: gem-difluoromethylenated Dapagliflozin analogs

Dapagliflozin is currently the most advanced SGLT2 inhibitor, which has been used in Phase III clinical trials for treatment of diabetes. Here we describe the design and synthesis of Dapagliflozin analogs modified with gem-difluoromethylene group. Their biological evaluation of in vitro inhibitory activity against human SGLT2 showed that some of the analogs with CF₂ at C-4 are better SGLT2 inhibitors compared with Dapagliflozin.     

Synthesis and biological activity of RS-abscisic acid and its analogs

Summary RS-Abscisic acid and some of its analogs have been obtained. The biological activity of these compounds has been studied in dependence on their structure.It was found that precursors of RS-abscisic acid suppress the growth of segments of coleoptiles to a considerably smaller extent than the acid itself.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR. Timiryazev Institute of Plant Physiology. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 731–735, November–December, 1970.     

Synthesis and biological activity of RS-abscisic acid and its analogs

Chemistry of Natural Compounds - RS-Abscisic acid and some of its analogs have been obtained. The biological activity of these compounds has been studied in dependence on their structure. It was...     

Synthesis and mesomorphic properties of Schiff base esters possessing terminal chloro substituent

<正>A homologous series of Schiff base esters,4-chlorobenzylidene-4'-n-alkanoyloxyanilines,containing even number of carbons at the end groups of the molecules(C_(n-1)H_(2n-1)COO-,n=4,6,8,10,12,14,16) were synthesized.The mesomorphic properties were investigated by differential scanning calorimetry(DSC) and polarizing optical microscopy(POM).It was found that the end groups of the molecules had an effect on the mesomorphic properties.n-Butanoyloxy was found non-mesogenic,whilst n-hexanoyloxy exhibited monotropic smectic phase.The higher members in this homologous series were enantiotropic smectogens.     

Synthesis and matrix metalloproteinase-12 inhibitory activity of ageladine A analogs

Synthesis of the 37 ageladine A analogs was accomplished by employing the total synthetic route of natural ageladine A previously explored by us. From the matrix metalloproteinase-12 (MMP-12) inhibitory activity assay carried out using the novel analogs, it appeared evident that the halogen atom at the 2-position of pyrrole ring was essential for the inhibitory activity and that the introduction of a bromine atom into the 4-position of pyrrole ring is very effective for producing potent activity. In addition, exchange of the pyrrole ring to an imidazole ring was extremely effective in increasing activity, and the analog 29 thus obtained was found to show approximately 4 times more potent activity than natural ageladine A.     

Synthesis and biological activity of hydroxylated analogs of RCAI-80

RCAI-80 is one of the ester analogs of KRN7000 (α-galactosylceramide). This compound released mainly T helper 2 (Th2) cytokines, such as IL-4 rather than T helper 1 (Th1) cytokines, such as IFNγ from the invariant natural killer T (iNKT) cells. In addition, it has been known that some of the hydroxylated derivatives of KRN7000 make the cytokine secretion bias to Th2 by decreasing the IFNγ production to almost zero. This time, the three compounds having these two characteristic properties, namely an ester group and also some extra hydroxy groups existing on the ester side chain and/or on the 2-acyloxy-3,4-dihydroxyoctadecyl main chain of RCAI-80, were synthesized to examine the biological activities. As a result, it was found that these compounds made the cytokine secretion skew to Th2. Therefore, their effectiveness for experimental autoimmune encephalomyelitis (EAE) was examined. It was recognized that one of them showed moderate suppression of EAE symptom.     

Synthesis and biological activity of some triarylantimony dipyrazolecarboxylates

A series of triarylantimony dipyrazolecarboxylates was synthesized by the reaction of pyrazolecarboxylic acid with triarylantimony dibromides in the presence of potassium hydroxide. The structures of the title compounds were confirmed by elemental analysis, ¹H NMR, IR, and mass spectra. Some of these compounds were found to possess antibacterial activity. © 2002 Wiley Periodicals, Inc. Heteroatom Chem 13:299–301, 2002; Published online in Wiley Interscience (www.interscience.wiley.com). DOI 10.1002/hc.10033     

Synthesis and biological activity of some fluorinated arylhydrazotriazoles

Potential biologically active derivatives of arylhydrazotriazole (3a–l) were prepared by the condensation reaction of diazonium salts using various aromatic amines (1a–l) and 1-(2,4-difluorophenyl)-2-(1H-1,2,4-triazol-1-yl) ethanones (2). The synthesized products were obtained in 75–85% yield. All the synthesized products were having good-excellent antifungal activity as compared with standard (Fluconazole and Ketoconazole) drugs.     

Synthesis and biological activity of some gossypol derivatives

Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 44–49, January–February, 1995. Original article submitted October 17, 1994.     

QSAR analysis of the acetylcholinesterase inhibitory activity of some tertiary amine derivatives of cinnamic acid

Structural Chemistry - Acetylcholinesterase (AChE) is an essential enzyme in the nervous system that increases the rate of the hydrolysis of the neurotransmitter acetylcholine. Excessive hydrolysis...     

Synthesis and biological evaluation of peptidyl organotrifluoroborates and their corresponding boron analogs

Six peptidyl organotrifluoroborates and their corresponding boronate esters and/or boronic acid analogs were designed and synthesized. Their anti-proliferative activity against hepatocellular carcinoma cells (HepG2) and human metastatic breast cancer cells (MDA-MB231) were evaluated by use of an MTT assay. Potassium {4-[(3S,6S,9S)-3,6-dibenzyl-9-isopropyl-4,7,10-trioxo-11-oxa-2,5,8-triazadodecyl]phenyl}trifluoroborate (B6) was potent (IC₅₀ = 29.9 μM) against MDA-MB231, and {4-[(3S,6S,9S)-6-benzyl-3-((benzyloxy)methyl)-9-isopropyl-4,7,10-trioxo-11-oxa-2,5,8-triazadodecyl]phenyl}boronic acid (B9) and Potassium {4-[(3S,6S,9S)-6-benzyl-3-((benzyloxy)methyl)-9-isopropyl-4,7,10-trioxo-11-oxa-2,5,8-triazadodecyl]phenyl}trifluoroborate (B10) had broad anti-proliferative activity against HepG2 (IC₅₀ = 24.7 and 21.8 μM, respectively) and MDA-MB231 (IC₅₀ = 24.5 and 18.9 μM, respectively).