Method for producing 1, 2-dihydropyridine-2-one compound
The present inventions provide a method for commercially producing a 1,2-dihydropyridine-2-one compound represented by the following formula (III-a) wherein the ring A represents an optionally substituted 2-pyridyl group, the ring B represents an optionally substituted phenyl group, and the ring C represents an optionally substituted phenyl group. Further, the invention provides crystals of 3-(2-cyanophenyl)-5-(2-pyridyl)-1-phenyl-1,2-dihydropyridin-2-one and production processes therefor.
1. A method for producing a compound represented by formula (III):
wherein A 1 , A 2 , A 3 , A 4 and A 5 are as defined below, or a salt thereof, which comprises reacting a compound represented by formula (1):
wherein each of A 1 , A 2 , A 3 and A 4 , which may be the same or different, is a hydrogen atom, an optionally substituted 6- to 14-membered aromatic hydrocarbon ring group or an optionally substituted 5- to 14-membered heteroaromatic ring group, and X is a leaving group, or a salt thereof with a compound represented by formula (II):
wherein A 5 is an optionally substituted 6- to 14-membered aromatic hydrocarbon ring group or an optionally substituted 5- to 14-membered heteroaromatic ring group; and R1 and R2 are as follows: 1) each of R1 and R2, which may be the same or different, is a hydrogen atom or a C1-6 alkyl group, and 2) the compound of formula (II) may form boroxine (a trimer) when both R1 and R2 are hydrogen atoms, or 3) R1, R2, the oxygen atoms and the boron atom, when taken together, form a 5- or 6-membered ring group optionally substituted by one to four C1-6 alkyl groups, in the presence of a palladium compound, a copper compound, a phosphorus compound and a base.
2. A production method according to claim 1 , wherein each of A 2 and A 4 is a hydrogen atom.
3. A production method according to claim 1 , wherein each of A 1 , A 3 and A 5 is a phenyl group, a pyridyl group, a pyrimidyl group, a thienyl group or a furyl group.
4. A production method according to claim 1 , wherein a compound represented by formula (III-a):
wherein the ring A, ring B and ring C are as defined below, or a salt thereof is produced by reacting a compound represented by formula (I-a):
wherein the ring A is an optionally substituted 2-pyridyl group, the ring B is an optionally substituted phenyl group, and X is a leaving group, or a salt thereof with a compound represented by formula (II-a):
wherein the ring C is an optionally substituted phenyl group; and R1 and R2 are as follows: 1) each of R1 and R2, which may be the same or different, is a hydrogen atom or a C1-6 alkyl group, and 2) the compound of formula (II-a) may form boroxine (a trimer) when both R1 and R2 are hydrogen atoms, or 3) R1, R2, the oxygen atoms and the boron atom, when taken together, form a 5- or 6-membered ring group optionally substituted by one to four C1-6 alkyl groups, in the presence of a palladium compound, a copper compound, a phosphorus compound and a base.
5. A production method according to claim 4 , wherein a compound represented by formula (III-b):
or a salt thereof is produced by reacting a compound represented by formula (I-b):
wherein X is a leaving group, or a salt thereof with a compound represented by formula (II-b):
wherein R1 and R2 are as defined above, in a solvent in the presence of a palladium compound, a copper compound, a phosphorus compound and a base.
6. A production method according to claim 5 , wherein the compound (II-b) is a compound represented by formula (II-b-1), formula (II-b-2), formula (II-b-3) or formula (II-b-4):
7. A production method according to claim 1 , wherein X is a halogen atom, an alkylsulfonyloxy group or an arylsulfonyloxy group.
8. A production method according to claim 1 , wherein the palladium compound is palladium acetate, palladium chloride or palladium hydroxide.
9. A production method according to claim 1 , wherein the phosphorus compound is triphenylphosphine or tri-tert-butylphosphine.
10. A production method according to claim 1 , wherein the copper compound is cuprous bromide, cuprous iodide, cuprous chloride or cuprous acetate.
11. A production method according to claim 1 , wherein the base is cesium carbonate, sodium carbonate or potassium carbonate.
12. A production method according to claim 1 , wherein the copper compound is used in an amount of 0.01 to 0.05 mole per mole of the compound represented by formula (1).
13. A production method according to claim 1 , wherein the reaction is carried out in a solvent and 1,2-dimethoxyethane or toluene is used as the solvent for reaction.