0000000001302196
AUTHOR
Mohammad Shahidul Islam
showing 11 related works from this author
Design, Construction, and Characterization of a New Regioisomer and Diastereomer Material Based on the Spirooxindole Scaffold Incorporating a Sulphon…
2020
The 1,3-dipolar cycloaddition reaction is one of the most rapid, and efficient protocols to access, and construct highly divergent heterocycle chiral auxiliaries. Free catalyst synthesis of spirooxindole scaffold incorporating sulphone moiety via one pot&ndash
X-ray Crystal Structure and Hirshfeld Analysis of Gem-Aminals-Based Morpholine, Pyrrolidine, and Piperidine Moieties
2020
The gem-aminals of 1,2-dimorpholinoethane (1) and 1-morpholino-3-morpholinium bromide propane (2) were synthesized by reaction of two molar ratio of morpholine with the halogenating agents in the presence of basic condition (K2CO3) in acetone at room temperature (RT) overnight. The structures of the centro-symmetric compound 1 and the morpholinium salt derivative 2 were assigned unambiguous by single crystal X-ray diffraction analysis and compared with the 1,2-di(pyrrolidin-1-yl)ethane 3 and 1,2-di(piperidin-1-yl)ethane 4. The 1,2-dimorpholinoethane molecule has a center of symmetry at the midpoint of the C-C bond of the ethyl moiety leading to two equivalent halves. It crystallized in mono…
Regio- and stereoselective synthesis of spiro-heterocycles bearing the pyrazole scaffold via [3+2] cycloaddition reaction
2022
Abstract Herein we reported the utility of one-pot multicomponent based [3+2] cycloaddition reaction transformation to prepare a new two hybrids of spirooxindoles engrafted with pyrazole skeleton. Upon treatment of the electron-deficient olefins based pyrazole motif with in situ the generated azomethine ylides (AY) of sarcosine with the 6-chloro-isatin afforded spiroadducts. To enlighten the regio- and diastereo-selectivity of these spiroheterocycles, single crystal X-ray diffraction analysis was presented. Using Hirshfeld calculations, many short distance contacts such as O…H, Cl…H, N…H, H…C, C…C and Cl…S have a great impact on the molecular packing and the crystal stability of 8a and 8b. …
Construction of Spirooxindole Analogues Engrafted with Indole and Pyrazole Scaffolds as Acetylcholinesterase Inhibitors
2021
Twenty-five new hits of spirooxindole analogs 8a–y engrafted with indole and pyrazole scaffolds were designed and constructed via a [3+2]cycloaddition (32CA) reaction starting from three components: new chalcone-based indole and pyrazole scaffolds 5a–d, substituted isatins 6a–c, and secondary amines 7a–d. The potency of the compounds were assessed in modulating cholinesterase (AChE) activity using Ellman’s method. Compounds 8i and 8y showed the strongest acetylcholine esterase inhibition (AChEI) with IC50 values of 24.1 and 27.8 μM, respectively. Molecular docking was used to study their interaction with the active site of hAChE. peerReviewed
Cu(ii)-thiophene-2,5-bis(amino-alcohol) mediated asymmetric Aldol reaction and Domino Knoevenagel Michael cyclization : a new highly efficient Lewis …
2022
The highly efficient Lewis acid-catalytic system Cu(II)-thiophene-2,5-bis(amino-alcohol) has been developed for enantioselective Aldol reaction of isatin derivatives with ketones. The new catalytic system also proved to be highly enantioselective for the one pot three-component Domino Knoevenagel Michael cyclization reaction of substituted isatin with malononitrile and ethylacetoacetate. The chiral ligand (2S,2′S)-2,2′-((thiophene-2,5-diylbis(methylene))bis(azanediyl))bis(3-phenylpropan-1-ol) (L1) in combination with Cu(OAc)2·H2O employed as a new Lewis acid catalyst, furnished 3-substituted-3-hydroxyindolin-2-ones derivatives (3a–s) in good to excellent yields (81–99%) with high enantiosel…
Exploiting the Chiral Ligands of Bis(imidazolinyl)- and Bis(oxazolinyl)thiophenes : Synthesis and Application in Cu-Catalyzed Friedel–Crafts Asymmetr…
2021
Five new C2-symmetric chiral ligands of 2,5-bis(imidazolinyl)thiophene (L1–L3) and 2,5-bis(oxazolinyl)thiophene (L4 and L5) were synthesized from thiophene-2,5-dicarboxylic acid (1) with enantiopure amino alcohols (4a–c) in excellent optical purity and chemical yield. The utility of these new chiral ligands for Friedel–Crafts asymmetric alkylation was explored. Subsequently, the optimized tridentate ligand L5 and Cu(OTf)2 catalyst (15 mol%) in toluene for 48 h promoted Friedel–Crafts asymmetric alkylation in moderate to good yields (up to 76%) and with good enantioselectivity (up to 81% ee). The bis(oxazolinyl)thiophene ligands were more potent than bis(imidazolinyl)thiophene analogues for …
CCDC 2039255: Experimental Crystal Structure Determination
2021
Related Article: Abdullah Mohammed Al-Majid, Matti Haukka, Saied M. Soliman, Abdullah Saleh Alamary, Saeed Alshahrani, M. Ali, Mohammad Shahidul Islam, Assem Barakat|2021|Symmetry|13|20|doi:10.3390/sym13010020
CCDC 2102639: Experimental Crystal Structure Determination
2021
Related Article: Mohammad Shahidul Islam, Matti Haukka, Saied M. Soliman, Abdullah Mohammed Al-Majid, A.F.M.Motiur Rahman, Ahmed Bari, Assem Barakat|2022|J.Mol.Struct.|1250|131711|doi:10.1016/j.molstruc.2021.131711
CCDC 2105913: Experimental Crystal Structure Determination
2022
Related Article: Mohammad Shahidul Islam, Abdullah Mohammed Al-Majid, Mohammad Azam, Ved Prakash Verma, Assem Barakat, Matti Haukka, Abdullah A. Elgazar, Amira Mira, Farid A. Badria|2021|ACS Omega|6|31539|doi:10.1021/acsomega.1c03978
CCDC 2022360: Experimental Crystal Structure Determination
2021
Related Article: Abdullah Mohammed Al-Majid, Matti Haukka, Saied M. Soliman, Abdullah Saleh Alamary, Saeed Alshahrani, M. Ali, Mohammad Shahidul Islam, Assem Barakat|2021|Symmetry|13|20|doi:10.3390/sym13010020
CCDC 2102638: Experimental Crystal Structure Determination
2021
Related Article: Mohammad Shahidul Islam, Matti Haukka, Saied M. Soliman, Abdullah Mohammed Al-Majid, A.F.M.Motiur Rahman, Ahmed Bari, Assem Barakat|2022|J.Mol.Struct.|1250|131711|doi:10.1016/j.molstruc.2021.131711