380917-97-5

The invention relates to a simple preparation method of perampanel. The method comprises: (1) carrying out an amidation reaction on a compound represented by a formula II and a compound represented bya formula III in a solvent or under a solvent-free condition to prepare a compound represented by a formula IV; and (2) carrying out condensation on the compound represented by the formula IV and a methylenenation reagent in a solvent in the presence of a catalyst to obtain a compound represented by a formula V, and removing hydrogen cyanide or hydrogen chloride under the action of an alkaline reagent to form a ring so as to prepare perampanel. According to the present invention, the method has advantages of cheap and easily available raw materials, simple process operation, high reaction selectivity of the unit, high yield and high purity of the product, less three-waste, high reaction atom economy and environmental protection.

The present invention describes a process for the synthesis of 3-(2-cyanophenyl)-5-(2- pyridyl)-1-phenyl-1,2-dihydro-pyridin-2-one (Perampanel) represented by the structure of formula (1), and salts thereof, especially salts with pharmaceutically acceptable acids. The present invention further relates to certain intermediates formed and/or used in such process.

The present invention provides novel process for preparation of 3-(2-cyanophenyl)-5-(2- pyridyl)-1-phenyl-1,2-dihydropyridin-2-one, commonly known as perampanel having the formula I. The present invention also provides novel intermediate compound of formula VI and process for the preparation of intermediate compound of formula VI. The present invention also provides purification of perampanel.

The present invention relates to processes for the preparation of perampanel and its intermediates.

The present invention provides intermediates useful for the synthesis of Perampanel and processes employing said intermediates for preparing Perampanel. The invention also provides processes for making the intermediates, crystalline forms of the intermediates and the use of the crystalline forms for preparing Perampanel.

The orally active, noncompetitive, selective AMPA receptor antagonist Perampanel, 2-[1,6-dihydro-6-oxo-1-phenyl-(2,3-bipyridin)-5-yl]benzonitrile, has been prepared from readily available, relatively inexpensive starting materials. The synthesis was carried out on a laboratory scale with no specialized equipment, and involved only two chromatographic purifications. Georg Thieme Verlag Stuttgart. New York.

Dysfunction of glutamatergic neurotransmission has been implicated in the pathogenesis of epilepsy and numerous other neurological diseases. Here we describe the discovery of a series of 1,3,5-triaryl-1H-pyridin-2-one derivatives as noncompetitive antagonists of AMPA-type ionotropic glutamate receptors. The structure-activity relationships for this series of compounds were investigated by manipulating individual aromatic rings located at positions 1, 3, and 5 of the pyridone ring. This culminated in the discovery of 2-(2-oxo-1-phenyl-5- pyridin-2-yl-1,2-dihydropyridin-3-yl)benzonitrile (perampanel, 6), a novel, noncompetitive AMPA receptor antagonist that showed potent activity in an in vitro AMPA-induced Ca2+ influx assay (IC50 = 60 nM) and in an in vivo AMPA-induced seizure model (minimum effective dose of 2 mg/kg po). Perampanel is currently in regulatory submission for partial-onset seizures associated with epilepsy.

A crystal of 3-(2-cyanophenyl)-5-(2-pyridyl)-1-phenyl-1,2-dihydropyridin-2-one characterized in having a diffraction peak at a diffraction angle (2θ±0.2°) of 15.4° in a powder X-ray diffraction or others.

An amorphous form of 3-(2-cyanophenyl)-5-(2-pyridyl)-1-phenyl-1,2-dihydropyridine-2-one.

The invention provides crystals of 3-(2-cyanophenyl)-5-(2-pyridyl)-1-phenyl-1,2-dihydropyridin-2-one and production processes therefor.

The present invention provides a novel compound having an excellent AMPA receptor inhibitory action and/or kainate inhibitory action. A compound represented by the following formula, a salt thereof or hydrates thereof. In the formula, Q indicates NH, O or S; and R1, R2, R3, R4 and R5 are the same as or different from each other and each indicates hydrogen atom, a halogen atom, a C1-6 alkyl group or a group represented by the formula -X-A (wherein X indicates a single bond, an optionally sbutituted C1-6 alkylene group etc.; and A indicates an optionally substituted C6-14 aromatic hydrocarbocyclic group or 5- to 14-membered aromatic heterocyclic group etc.).