Browsing by Author "Abdul Majid, Amin Malik Shah"

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    A novel caryophyllene type sesquiterpene lactone from Asparagus falcatus (Linn.); Structure elucidation and anti-angiogenic activity on HUVECs
    (2012) Ghalib R.; Rokiah H.; Sulaiman, Othman; Mehdi S.; Valkonen A.; Rissanen K.; Trifunović, Srećko; Khadeer Ahamed, Mohamed B; Abdul Majid, Amin Malik Shah; Kawamura F.
    In this study the novel caryophyllene type sesquiterpene lactone (aspfalcolide) has been isolated from the leaves of Asparagus falcatus (Linn.) and characterized by IR, 1D NMR, 2D NMR, EI-MS, HR-ESI-MS and X-ray single crystal diffraction analysis. The aspfalcolide crystallizes in the orthorhombic space group P2 12 12 1 with a = 6.37360(10), b = 7.6890(2), c = 27.3281(6) , α = β = γ = 90 ° and Z = 4. One intermolecular O-H⋯O hydrogen bond enforces these natural molecules to form infinite chains through the crystal. Aspfalcolide was screened for its anti-angiogenic activity in human umbilical vein endothelial cells (HUVECs) and the result showed the remarkable inhibitory effect of aspfalcolide on the proliferation (IC 50 1.82 μM), migration and tube formation of HUVECs. © 2011 Elsevier Masson SAS. All rights reserved.
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    Green synthesis of novel class of benzazocine derivatives, their crystal structures and anticancer activity
    (2017) Ghalib R.; Rokiah H.; Sulaiman, Othman; Jawad A.; Mehdi S.; Bogdanovic, Goran A.; Trifunović, Srećko; Kawamura F.; Ahamed B.; Abdul Majid, Amin Malik Shah
    © 2017 Bentham Science Publishers. Background: Heterocyclic molecules have been synthesized by a green & facile strategy. These molecules contain a 8-membered azocine ring. The structures have been determined by spectral analysis and single crystal X-ray analysis. These compounds have anticancer activity. Method: A mixture of ninhydrin and acetone/ethylmethylketone in acetic acid in molar ratio 1:1 were heated on water bath for 15 minutes. The reaction mixtures were dried on rotary evaporator and crystallized with chloroform- n-hexane (1:1 v/v) to give the colorless crystals of 1 And 2 respectively. Compounds 3 and 4 were synthesized by adding o-phenylenediamine to the completed reaction mixtures of 1 and 2 and each was further heated on water bath for 5 minutes. The dried reaction mixtures were chromatographed over a silica gel column and crystalized as 3 and 4. Results: This strategy resulted novel class of anticancer benzazocines (3 & 4). Conclusion: This method features mild reaction conditions and simple operation. The synthesis completes in two steps; from ninhydrin to 1 & 2 and from 1 & 2 to 3 & 4. The same basic skeleton of 3 & 4 and the same synthesis procedure clearly shows the general applicability of this reaction that is also proved enough by single crystal Xray analysis and the strategy can be applicable for a wide range of other substrates. The obtained compounds are potential anticancer agents.