Rong-Bi Han

Synthesis and anticonvulsant activity of 8-alkoxy-5,6-dihydro-4H-[1,2,4]triazolo[4,3-a][1]benzazepin-1-one derivatives.

A series of novel 8-alkoxy-5,6-dihydro-4H-[1,2,4]triazolo[4,3-a][1]benzazepin-1-one derivatives were synthesized and screened for their anticonvulsant activities by the maximal electroshock (MES) test, subcutaneous pentylenetetrazol (scPTZ) test, and their neurotoxicity was evaluated by the rotarod neurotoxicity test (Tox). The results of these tests demonstrated that 8-heptyloxy-5,6-dihydro-4H-[1,2,4]triazolo[4,3-a][1]benzazepin-1-one (3f) and 8-hexyloxy -5,6-dihydro-4H-[1,2,4]triazolo[4,3-a][1]benzazepin-1-one (3e) were the most promising compounds, with median effective dose (ED(50)) of 17.6 and 17.9 mg/kg, and protective index (PI) of greater than 63.4 and 62.4 in the MES test, respectively. These PI values were higher than the PI value of the prototype antiepileptic drug carbamazepine. The scPTZ test showed that 8-pentyloxy-5,6-dihydro-4H-[1,2,4]triazolo[4,3-a][1]benzazepin-1-one (3d) was the most potent with ED(50) value of 38.0 mg/kg and PI value of greater than 29.4, which is much safer than marketed drug carbamazepine. The possible structure-activity relationship was discussed.

Synthesis and biological evaluation of 9-alkoxy-6,7-dihydro-5H-benzo[c] [1,2,4]triazolo[4,3-a]azepines as potential anticonvulsant agents.

A novel series of 9-alkoxy-6,7-dihydro-5H-benzo[c][1,2,4]triazolo[4,3-a]azepine derivatives was synthesized and screened for anticonvulsant activity by the maximal electroshock (MES) test and the subcutaneous pentylenetetrazol (scPTZ) test. Neurotoxic effects were also determined by the rotarod neurotoxicity test. The results revealed that all of the compounds exhibited anticonvulsant activity, Compound 5d was found to possess the most potential anticonvulsant activity in the anti-MES potency test; it had a median effective dose (ED50) of 12.3 mg/kg, a median toxicity dose (TD50) of 73.5 mg/kg, and a protective index (PI) of 6.0, which is slightly lower than the PI of the prototype drug carbamazepine (ED50=8.8, PI=8.1). In the scPTZ test, compound 5c was the most active, with an ED50 value of 19.8 mg/kg, a TD50 value of 80.8 mg/kg and a PI value of 4.1, which are much greater than the ED50 and the PI of the prototype drug carbamazepine (ED50>100, PI<0.72), Possible structure-activity relationships are also discussed.

High-Yield Method for the Preparation of 1,3,4,5-Tetrahydro-7-methoxy-2H-1-benzazepin-2-one with Excellent Regio- and Stereoselectivity

Abstract We have surveyed the effects of different acid catalysts, reaction times, and temperatures on the yield, regioselectivity, and stereoselectivity and calculated the ketoxime isomerization and activation energy of the title compound. A facile synthetic procedure with good yields and good regio- and stereoselectivity for Beckmann rearrangement of oxime sulfonate with ZnCl2 in the presence of solvent is developed. GRAPHICAL ABSTRACT

(1E)-6-Meth-oxy-3,4-dihydro-naphthalen-1(2H)-one oxime.

In the crystal structure of the title compound, C11H13NO2, the molecules are paired into centrosymmetric dimers via intermolecular O—H⋯N hydrogen bonds.

Synthesis and Anticonvulsant Activity of 9-Alkoxy-6,7-dihydro-2H-benzo[c][1,2,4]triazolo[4,3-a]azepin-3[5H]-ones

Abstract A series of novel 9-alkoxy-6,7-dihydro-2H-benzo[c][1,2,4]triazolo[4,3-a]azepin-3(5H)-one derivatives was designed and synthesized starting from 2,3,4,5-tetrahydro-7-hydroxy-1H-2-benzazepin-1-one. The structures of these compounds were confirmed by mass, 1H NMR infrared spectra, and elemental analysis. Their anticonvulsant activity was evaluated by maximal electroshock (MES) test, and their neurotoxic effects were determined by the rotarod neurotoxicity test. The results shown that 3k was the most active compound with median effective dose (ED50) of 27.3 mg/kg, median toxicity dose (TD50) of 118.3 mg/kg, and protective index (PI) of 4.3. Possible structure–activity relationship is discussed. GRAPHICAL ABSTRACT

Synthesis and anticonvulsant activity of some novel 7-(benzylamino) -1 H -benzo[b][1,4]diazepine-2,4(3 H , 5 H )-dione derivatives

A series of novel 7-(benzylamino)-1H-benzo[b][1,4]diazepine-2,4(3H, 5H)-dione derivatives were synthesized and screened for their anticonvulsant activities by the maximal electroshock (MES) test, subcutaneous pentylenetetrazol (scPTZ) test, and their neurotoxicity was evaluated by the rotarod neurotoxicity test (Tox). The study showed that the compound 8c (7-(4-fluorobenzylamino)-1,5-dimethyl-1H-benzo[b][1,4]diazepine-2,4(3H,5H)-dione) was the most promising compound, with median effective dose (ED50) of 36.5 mg/kg, and protective index (PI) values of 4.5 in the MES test. In the scPTZ test, compound 8c also exhibited better anticonvulsant activity (ED50 = 68.2 mg/kg), and the ED50 values of compounds 8c were smaller than that of the reference antiepileptic drugs carbamazepine (ED50 > 100 mg/kg), phenytoin (ED50 > 300 mg/kg), and sodium valproate (ED50 = 149 mg/kg). The possible structure activity relationship was discussed.

Synthesis and Anticonvulsant Activity of 3-(alkylamino, alkoxy)-1,3,4,5- Tetrahydro-2H-benzo [b] azepine-2-one Derivatives

BACKGROUND & OBJECTIVE A series of novel 3-Substituted-1,3,4,5-Tetrahydro-2H-benzo [b] azepine-2-one Derivatives (4, 5, 7, 10, 12, 5a-j, 8a-e) were synthesized from 1,2,3,4-Tetrahydro-1- naphthalenone. The structures of these compounds were confirmed by IR, 1H NMR, 13C NMR, MASS spectra and elemental analysis. Their anticonvulsant activity was evaluated by the maximal electroshock (MES) test, subcutaneous pentylenetetrazol (scPTZ) test, and their neurotoxicity was evaluated by the rotarod neurotoxicity test. Compound 4 showed the maximum anticonvulsant activity against the maximal electroshock test (ED50=26.4, PI =3.2) and against the subcutaneous pentylenetetrazol test (ED50=40.2, PI =2.1). CONCLUSION Possible structure-activity relationship was discussed.

Synthesis of betulin derivatives containing triazole fragments

30-Triazole derivatives of betulin were synthesized through isothiocyanation, hydrazidation, and cyclization steps using betulin as a starting material.