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7273 ± 621 11.6 ± 1.6 8.12 ± 0.26 Donepezil 916 ± 19 8.32 ± 0.75 5.73 ± 0.44 6-Chlorotacrine 43.9 ± 17 205 ± 18 130 ± 10 Tacrine 72.7 ± 4.2 1.06 ± 0.05 0.82 ± 0.08 17b 88.7 ± 0.2 2.60 ± 0.23 1.86 ± 0.07 17a 7.25 ± 0.33 2.16 ± 0.21 0.82 ± 0.06 16b 8.06 ± 0.32 5.13 ± 0.52 2.28 ± 0.06 16a 66.3 ± 4.0 0.27 ± 0.03 0.09 ± 0.01 15b 136 ± 9 0.67 ± 0.06 0.57 ± 0.05 15a 12.4 ± 0.6 0.88 ± 0.04 0.29 ± 0.03 14b 12.4 ± 0.6 4.04 ± 0.06 1.74 ± 0.02 14a human BChE human AChE bovine AChE compound IC 50  (nM)
Structures of tacrine, donepezil, and the known donepezil−tacrine hybrids 3 and 4. Synthesis of the donepezil−tacrine hybrids 14−17a,b
15a 15b
Thioflavin T Competition Assay Results with the Dihydrochlorides of the Donepezil−Tacrine Hybrids 15a and 15b, and the Hydrochlorides of Tacrine, 6-Chlorotacrine, and Donepezil 26.0  ± 3.5 Donepezil·HCl 12.4  ± 1.9 6-Chlorotacrine·HCl 12.6  ± 3.8 Tacrine·HCl 57.0  ± 2.0 15b ·2HCl 79.4  ± 3.5 15a ·2HCl Reduction of fluorescence (%) Compound
Compounds 15a and 15b superimposed 15a, donepezyl, tacrine 15b, donepezyl, tacrine
Stacking Epot, rms (backbone, heavy)

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AChE

  • 1. 7273 ± 621 11.6 ± 1.6 8.12 ± 0.26 Donepezil 916 ± 19 8.32 ± 0.75 5.73 ± 0.44 6-Chlorotacrine 43.9 ± 17 205 ± 18 130 ± 10 Tacrine 72.7 ± 4.2 1.06 ± 0.05 0.82 ± 0.08 17b 88.7 ± 0.2 2.60 ± 0.23 1.86 ± 0.07 17a 7.25 ± 0.33 2.16 ± 0.21 0.82 ± 0.06 16b 8.06 ± 0.32 5.13 ± 0.52 2.28 ± 0.06 16a 66.3 ± 4.0 0.27 ± 0.03 0.09 ± 0.01 15b 136 ± 9 0.67 ± 0.06 0.57 ± 0.05 15a 12.4 ± 0.6 0.88 ± 0.04 0.29 ± 0.03 14b 12.4 ± 0.6 4.04 ± 0.06 1.74 ± 0.02 14a human BChE human AChE bovine AChE compound IC 50 (nM)
  • 2. Structures of tacrine, donepezil, and the known donepezil−tacrine hybrids 3 and 4. Synthesis of the donepezil−tacrine hybrids 14−17a,b
  • 4. Thioflavin T Competition Assay Results with the Dihydrochlorides of the Donepezil−Tacrine Hybrids 15a and 15b, and the Hydrochlorides of Tacrine, 6-Chlorotacrine, and Donepezil 26.0 ± 3.5 Donepezil·HCl 12.4 ± 1.9 6-Chlorotacrine·HCl 12.6 ± 3.8 Tacrine·HCl 57.0 ± 2.0 15b ·2HCl 79.4 ± 3.5 15a ·2HCl Reduction of fluorescence (%) Compound
  • 5. Compounds 15a and 15b superimposed 15a, donepezyl, tacrine 15b, donepezyl, tacrine
  • 6. Stacking Epot, rms (backbone, heavy)