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    Design, synthesis and pharmacological evaluation of pyrimidobenzothiazole-3-carboxylate derivatives as selective L-type calcium channel blockers

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    Publication date
    2016
    Author
    Chikhale, R.
    Thorat, S.
    Pant, A.
    Jadhav, A.
    Thatipamula, K.C.
    Bansode, Ratnadeep V.
    Bhargavi, G.
    Karodia, Nazira
    Rajasekharan, M.V.
    Paradkar, Anant R.
    Khedekar, Pramod
    Show allShow less
    Keyword
    3d-qsar
    Ace
    Benzothiazole
    Hypertension
    Myosin light chain kinase
    Peer-Reviewed
    Yes
    
    Metadata
    Show full item record
    Abstract
    L-type voltage gated calcium channels play essential role in contraction of various skeletal and vascular smooth muscles, thereby plays important role in regulating blood pressure. Dihydropyridine receptors have been targeted for development of newer antihypertensive agents, one of the structurally analogs nucleus dihydropyrimidines have been reported earlier by us as a potential agent toward development of calcium channel modulator. A pre-synthetic QSAR was run and on the basis of structure activity relationship a series of twenty three molecules was synthesized and studied by myosin light chain kinase assay (MLCK), Angiotensin Converting Enzyme (ACE) colorimetric assay, non-invasive blood pressure (NIBP) and invasive blood pressure (IBP) methods. Molecules with significant efficacy were studied for their single crystal X-ray diffraction, molecular docking, molecular dynamics and post-synthetic QSAR. The NIBP and IBP methods screened molecules with better percentage inhibition versus time compared to standard drug Nifedipine. The lead compound ethyl 2-methyl-4-(3-nitrophenyl)-4H-pyrimido [2,1-b] [1,3] benzothiazole-3-carboxylate (26) presented a triclinic structure with polymeric chain packing in lattice. 26 exhibited IC50 on MLCK assay of 2.1+/-1.7 muM with selectivity of L-type calcium channels and comparative to Nifedipine. It offered satisfactory physicochemical properties with partition coefficient of (ClogP) 4.64. Its pharmacokinetic profile is also good with Cmax at 0.40 mug/ml by oral route with Tmax reaching in 0.5 h which means in 30 min. 26 also exhibits superior t1/2 of 5.4 h and oral bioavailability of (F) 56.75% with an AUC0-infinity of 0.84 mug h/ml. Molecular docking studies indicates toward the interaction of lead compound via hydrogen bonds with Lys144, Glu181 and Asp183, it forms the Van der Walls interactions with Ser18, Asp20, Asn187, Pro185, Glu180, Glu181 and Arg10 with Glide score and Glide energy to be -3.602 and -47.098, respectively. Post-synthetic QSAR of newly synthesized molecules indicates toward improvement with respect to steric descriptor which contributed negatively in former series.
    URI
    http://hdl.handle.net/10454/9327
    Version
    No full-text available in the repository
    Citation
    Chikhale R, Thorat S, Pant A et al (2016) Design, synthesis and pharmacological evaluation of pyrimidobenzothiazole-3-carboxylate derivatives as selective L-type calcium channel blockers. Bioorganic and Medicinal Chemistry. 23(20): 6689-6713.
    Link to publisher’s version
    http://dx.doi.org/10.1016/j.bmc.2015.09.009
    Type
    Article
    Collections
    Life Sciences Publications

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