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Conventional and Microwave-Assisted Synthesis of Trisubstituted-1, 2, 4-Triazoles and Their Structure-Activity Relationship Studies

Thesis Info

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Author

Virk, Naeem Akhtar

Program

PhD

Institute

Government College University

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2019

Thesis Completion Status

Completed

Subject

Chemistry

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/11625/1/Naeem%20Akhtar%20Virk%20chemistry%202019%20%20GCU%20lhr%20prr_.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676725792454

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The chemistry of life has been extensively and effectively elaborated by organic chemists. No doubt, all the fields of science are struggling for the benefit of human beings and the chemists are well known in this regard. The organic or medicinal chemists are the main worker of improving the health. A number of compounds have been synthesized in search of new drug candidates by the orgnic chemists and also they have been successful up to much extent in this regard. The importance of this process can be realized from the increasing inactivity of the running drugs against different diseases. Hence the synthesis of new molecules in search of new drug candidates against different diseases is an ever green process. This was the motivating aspect of the literature survey of synthetic chemistry which encouraged us to design new molecules and evaluate their biological potential. The bioactivity potential of some heterocyclic moieties (as discussed in introduction and review of literature) prompted has to design such type of molecules which bear more than one heterocyclic moieties. These considered heterocyclic moieties included piperidine and 1,2,4-triazole. The aim of submerging different heterocyclic functionalities into one core was to boost up their bioactivity potential. Furthermore, the variation in some part of final molecules was also processed in order to acquire new potent drug candidates. The pharmacological evaluation included enzyme inhibition, antioxidant activity and bovine serum albumin (BSA) binding analysis. The enzyme inhibition results were further substantiated through molecular docking analysis. The presented research work has been distributed into eight solid schemes for the synthesis of ninety six compounds. Ethyl isonipecotate (2) was treated with 4methoxybenzene sulfonyl chloride (1) in 5% sodium carbonate at pH of 9-10 to get ethyl-1-[(4-methoxyphenyl)sulfonyl]piperidine-4-carboxylate (3). Compound 3 and hydrazine monohydrate were refluxed in methanol to acquire 1-[(4methoxyphenyl)sulfonyl]piperidine-4-carbohydrazide (4). Compound 4 was refluxed with phenyl isothiocyanate in methanol to acquire an intermediate compound (2-({1[(4-methoxyphenyl)sulfonyl]-4-piperidinyl}carbonyl)-N-phenyl-1-hydrazinecarbothio amide) which was refluxed in basic medium to get 5-{1-[(4-methoxyphenyl)sulfonyl]4-piperidinyl}-4-phenyl-4H-1,2,4-triazole-3-thiol (5). Compound 5 was stirred with xiii different aralkyl halides (6a-j) in the presence of NaH and DMF using conventional and microwave assisted methods. 3-Aralkylthio-5-{1-[(4-methoxyphenyl)sulfonyl]-4piperidinyl}-4-phenyl-4H-1,2,4-triazole (7a-j) were obtained through filtration from aqueous medium. The compound 5 was treated with equimolar N-substituted-2bromoacetamides (10a-t) to acquire N-alkyl/aralkyl/aryl/phenyl-2-[(5-{1-[(4methoxyphenyl) sulfonyl]-4-piperidinyl}-4-phenyl-4H-1,2,4-triazol-3-yl)sulfanyl] acetamide (11a-t). The electrophiles, 10a-t, were synthesized by the reaction of alkyl/aralkyl/aryl/phenyl amines (8a-t) and bromoacetyl bromide (9) in 5% sodium carbonate solution. The compound 5 was treated with equimolar N-substituted-2bromopropanamides (13a-r) to acquire N-alkyl/aralkyl/aryl/phenyl-2-[(5-{1-[(4methoxyphenyl) sulfonyl]-4-piperidinyl}-4-phenyl-4H-1,2,4-triazol-3-yl)sulfanyl] propanamide (14a-r). The electrophiles, 13a-r, were synthesized by the reaction of alkyl/aralkyl/aryl/phenyl amines (8a-i, k, m-t) and 2-bromopropionyl bromide (12) in 5% sodium carbonate solution. Compound 4 was refluxed with methyl isothiocyanate in methanol to acquire an intermediate compound (2-({1-[(4-methoxyphenyl) sulfonyl]-4-piperidinyl}carbonyl)-N-methyl-1-hydrazinecarbothioamide) which was refluxed in basic medium to get 5-{1-[(4-methoxyphenyl)sulfonyl]-4-piperidinyl}-4methyl-4H-1,2,4-triazole-3-thiol (15). Compound 15 was stirred with different aralkyl halides (6a-j) in the presence of NaH and DMF using conventional and microwave assisted methods. 3-Aralkylthio-5-{1-[(4-methoxyphenyl)sulfonyl]-4-piperidinyl}-4methyl-4H-1,2,4-triazole (16a-j) were obtained through filtration from aqueous medium. The compound 15 was treated with equimolar N-substituted-2bromoacetamides (10a-t) to acquire N-alkyl/aralkyl/aryl/phenyl-2-[(5-{1-[(4methoxyphenyl) sulfonyl]-4-piperidinyl}-4-methyl-4H-1,2,4-triazol-3-yl)sulfanyl] acetamide (17a-t). The compound 15 was treated with equimolar N-substituted-2bromopropanamides (13a-r) to acquire N-alkyl/aralkyl/aryl/phenyl-2-[(5-{1-[(4methoxyphenyl) sulfonyl]-4-piperidinyl}-4-methyl-4H-1,2,4-triazol-3-yl)sulfanyl] propanamide (18a-r). The synthesized compounds were initially verified through TLC and stored for further analysis. The synthesized compounds were spectroscopically characterized by using IR, 1H-NMR, 13C-NMR, HMQC, HMBC, COSY, NOESY and EIMS spectral information to justify the available main functional groups, hydrogen atoms, carbon atoms and the fragmentation pattern of the structures of synthesized compounds. xiv The synthesized compounds were screened for enzyme inhibition activity against six different enzymes and also for antioxidant activity. The different six enzymes included acetyl cholinesterase (AChE), butyryl cholinesterase (BChE), αglucosidase, urease, lipoxygenase and carbonic anhydrase II enzyme. Almost all the compounds were found to be excellent active agents against these enzymes. Antioxidant activityof all the synthesized molecules wasalso tested in search of some unique drug candidates. The chemistry of active sites and different functionalities responsible for the best pharmacological potential of all the synthesized compounds was verified through docking studies. In addition to it, the evaluation of protein drug interaction assisted us in understanding the various binding sites and binding constant to justify the stay of the drugs in the body, their circulation, metabolism, elimination and pharmacodynamics. The sketched compounds in the eight schemes were synthesized efficiently with high yield and purity through environment friendly protocol with minimum cost and time. The time of synthesis and the yield were compared for two modes of synthetic methods including conventional and microwave assisted ones. The following synthetic as well as biological screening studies resulted into the identification of a numberof compoundsbeing active against the considered enzymes. These enzymes are responsible for different kind of diseases and so the bioactive potent compounds may be considered as new drug candidates for the concerned diseases.
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Potential of Microbial Insecticides and Diatomaceous Earth Against Three Coleopterous Insect Pests of Stored Grains under Different Abiotic Conditions

Sitophilus granarius (L.), Rhyzopertha dominica (F.) and Oryzaephilus surinamensis (L.) are the damaging insect pests of cereals and their commodities and are able to cause significant losses. Current research was performed to evaluate the lethal and progeny inhibition effect of microbial-based insecticides i.e entomopathogenic fungi (EPF) Metarhizium anisopliae and Beauveria bassiana as well as bacterial based insecticides (spinetoram and abamectin) solitary andwith combination of two formulations of diatomaceous-earth (DE) against S. granarius, O. surinamensis and R. dominica. Three concentrations (1x108, 1.5x108 and 2x108 spores/kg grain) of each EPF were used while for bacterial based insecticides concentrations were 0.5, 1.0 and 1.5ppm. Similarly, for diatomaceous earth, three different doses (200, 400 and 800 ppm) of every formulation were applied. Completely Randomized Design (CRD) was used with three repetitions of all treatments. Mortality of test insects was recorded after 7, 14 and 21 days while after 60 days for post-treatment progeny build up. Each bioassay was performed at three levels of temperature (25°, 30° and 35°C) and relative humidity (r.h.; 45, 60 and 75%). Collected statistics were examined with applicable statistical methods using R-Software.The data analyses had shown diversified results regarding test insect susceptibility at different abiotic conditions. In case of Bacterial based insecticides, the response of treatment remained best at high temperature and low r.h. for all test insects. Complete control was achieved after 14 days for S. granarius and R. dominica while for O. surinamensis 100% mortality was not attained even after 21-d of exposure period. Progeny production was remained totally suppressed for S. granarius and R. dominica while in case of O. surinamensis there was significant reproduction at some abiotic conditions with maximum production at temperature of 30°C with 75% r.h. The response of-D.E against test insects was also effective and the most vulnerable species was O. surinamensis followed by S. granarius and R. dominica. It was observed that high temperature, low r.h. levels, higher dosages and long exposure periods increased the efficacy of DEs. Regarding progeny production, low temperature and high humidity remained most favourable for progeny emergence in DE-treated grains. The effects of EPF remained somewhat similar to the response of DE but overall mortality was low. Among tested species of insects R. dominica remained most susceptible to the application of EPF followed by O. surinamensis and S. granarius. The best abiotic condition for B. bassiana was low temperature (25°C) and moderate (60%) humidity while for M. anisopliae moderate temperature (30°C) and moderate (60%) humidity remained suitable at which maximum response was attained. Long exposure intervals and higher dose rates increased the mortality in each case. In the case of progeny development, the emergence of offspring was suppressed at moderate and low temperature for M. anisopliae and B. bassiana respectively with moderate r.h. When DE was applied in combination with the microbial insecticides, a synergistic effect was noticed in all combinations and R. dominica and S. granarius remained more susceptible as compared to O. surinamensis. The response of abiotic condition was significant for combination of DE and EPF while for DE and bacterial based insecticide it was non-significant. The results of the study divulge that all applied microbial based insecticides and DE are very effective for the control of these test insects and different abiotic conditions are responsible for affecting their efficacy. Furthermore, the combinations of these microbial insecticides with DE have a synergistic response against test insects. This study also recommends that attention should be paid to the interaction of abiotic factors with the efficacy of DE and microbial insecticides before planning IPM strategy for stored grain insect pests.