Processes for the preparation of 2-aminomethlpyridines and the 2-cyanopyridines used in their preparation
First Claim
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1. A process for the preparation of a compound of general formula (I):
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or a salt thereof,which process comprises the catalytic hydrogenation of a compound of general formula (II);
or a salt thereof,wherein X is halogen;
each Y, which may be the same or different, is halogen, haloalkyl, alkoxycarbonyl or alkylsulphonyl; and
n is 0 to 3, in the presence of a catalyst comprising palladium;
in a solvent and at a temperature in the range of from 0°
C. to 60°
C.
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Abstract
The invention relates to a process for the preparation of a compound of formula (V), according to the following scheme: wherein the various substituants are as defined in the description
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Citations
21 Claims
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1. A process for the preparation of a compound of general formula (I):
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or a salt thereof, which process comprises the catalytic hydrogenation of a compound of general formula (II);
or a salt thereof, wherein X is halogen;
each Y, which may be the same or different, is halogen, haloalkyl, alkoxycarbonyl or alkylsulphonyl; and
n is 0 to 3, in the presence of a catalyst comprising palladium;
in a solvent and at a temperature in the range of from 0°
C. to 60°
C.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
wherein L is a leaving group;
R1 and R2 each represent the same or different halogen; and
m is 0, 1 or 2, to produce a compound of formula (V);
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15. A process according to claim 1 which is performed in the presence of a strong acid selected from the group consisting of hydrochloric acid, hydrobromic acid, sulphuric acid, and phosphoric acid.
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16. The process of claim 15 wherein the strong acid is hydrochloric acid.
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17. The process of claim 14 wherein the compound of formula (V) is selected from the group consisting of:
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N-[(3-chloro-5-trifluoromethyl-2-pyridyl)methyl]-2,6-dichlorobenzamide, N-[(3-chloro-5-trifluoromethyl-2-pyridyl)methyl]-2,6-difluorobenzamide, N-[(3-chloro-5-trifluoromethyl-2-pyridyl)methyl]-2-chloro-6-fluorobenzamide, N-[(3-chloro-5-trifluoromethyl-2-pyridyl)methyl]-2,3-difluorobenzamide, N-[(3-chloro-5-trifluoromethyl-2-pyridyl)methyl]2,4,6-trifluorobenzamide, and N-[(3-chloro-5-trifluoromethyl-2-pyridyl)methyl]-2-bromo-6-chlorobenzamide.
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18. A process for the preparation of a compound of the formula (I):
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or a salt thereof, which process comprises the catalytic hydrogenation of a compound of the formula (II);
or a salt thereof, in the presence of; (A) a strong acid selected from the group consisting of hydrochloric acid, hydrobromic acid, sulphuric acid, and phosphoric acid, (B) a catalyst comprising palladium, (C) a catalyst inhibitor selected from the group consisting of alkali metal bromides, alkali metal iodides, ammonium bromide, ammonium iodide, hydrogen bromide, and hydrogen iodide;
in methanol and at a temperature in the range of from 0°
C. to 60°
C.- View Dependent Claims (19, 20, 21)
wherein L is a leaving group;
R1 and R2 each represent the same or different halogen; andm is 0, 1 or 2, to produce a compound of formula (V);
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21. The process of claim 19 wherein the compound of formula (V) is selected from the group consisting of:
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N-[(3-chloro-5-trifluoromethyl-2-pyridyl)methyl]-2,6-dichlorobenzamide, N-[(3-chloro-5-trifluoromethyl-2-pyridyl)methyl]-2,6-difluorobenzamide, N-[(3-chloro-5-trifluoromethyl-2-pyridyl)methyl]-2-chloro-6-fluorobenzamide, N-[(3-chloro-5-trifluoromethyl-2-pyridyl)methyl]-2,3-difluorobenzamide, N-[(3-chloro-5-trifluoromethyl-2-pyridyl)methyl]2,4,6-trifluorobenzamide, and N-[(3-chloro-5-trifluoromethyl-2-pyridyl)methyl]-2-bromo-6-chlorobenzamide.
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Specification