Preparation and uses of N-methylnitrone
First Claim
1. A process which comprises:
- a) adding an aqueous solution of a peroxidic compound to an aqueous solution of dimethylamine and sodium bicarbonate, and maintaining the temperature of the resultant mixture in the range of about 0°
to about 30°
C. to form a reaction mixture in which N,N-dimethylhydroxylamine has been formed; and
b) mixing together (i) reaction mixture from a), (ii) a peroxidic compound, and (iii) a transition metal-containing oxidation catalyst, and subjecting the resultant mixture to reaction conditions effective to form a reaction mixture in which N-methylnitrone has been formed.
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Accused Products
Abstract
Oxidation of secondary amines with hydrogen peroxide and sodium tungstate is reported to give good yields of nitrones. However, when using dimethylamine in this manner, a considerable amount of N,N-dimethylformamide was produced as a co-product. To more selectively produce N-methylnitrone from dimethylamine, a two-step process is used which comprises (a) mixing together dimethylamine and a peroxidic compound, and subjecting the resultant mixture to reaction conditions effective to form a reaction mixture in which N,N-dimethylhydroxylamine has been formed; and (b) mixing together (i) reaction mixture from (a), (ii) a peroxidic compound, and (iii) a transition metal-containing oxidation catalyst, and subjecting the resultant mixture to reaction conditions effective to form a reaction mixture in which N-methylnitrone has been formed. Highest yields of N-methylnitrone are achieved by conducting step (b) at a pH in the range of 7 to about 12, and at a temperature in the range of about -10° to about 100° C.
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Citations
33 Claims
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1. A process which comprises:
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a) adding an aqueous solution of a peroxidic compound to an aqueous solution of dimethylamine and sodium bicarbonate, and maintaining the temperature of the resultant mixture in the range of about 0°
to about 30°
C. to form a reaction mixture in which N,N-dimethylhydroxylamine has been formed; andb) mixing together (i) reaction mixture from a), (ii) a peroxidic compound, and (iii) a transition metal-containing oxidation catalyst, and subjecting the resultant mixture to reaction conditions effective to form a reaction mixture in which N-methylnitrone has been formed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A process which comprises:
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a) feeding aqueous hydrogen peroxide solution to an aqueous solution formed from ingredients comprising water, dimethylamine and sodium bicarbonate while maintaining the reaction temperature in the range of about 0°
to about 30°
C. to form a reaction mixture in which N,N-dimethylhydroxylamine has been formed; andb) subjecting a mixture formed from ingredients comprising (i) reaction mixture from a), (ii) a peroxidic compound, and (iii) a transition metal-containing oxidation catalyst to reaction conditions effective to form a reaction mixture in which N-methylnitrone has been formed. - View Dependent Claims (9, 10, 11, 12)
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13. A process which comprises:
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a) adding an aqueous solution of a peroxidic compound to an aqueous solution of dimethylamine and sodium bicarbonate, while maintaining the reaction temperature in the range of about 0°
to about 30°
C. to form a reaction mixture in which N,N-dimethylhydroxylamine has been formed;b) mixing together (i) reaction mixture from a), (ii) a peroxidic compound, and (iii) a transition metal-containing oxidation catalyst, and subjecting the resultant mixture to reaction conditions effective to form a reaction mixture in which N-methylnitrone has been formed; and c) mixing together N-methylnitrone from b) and styrene, and subjecting the resultant mixture to reaction conditions effective to produce a reaction mixture in which 2-methyl-5-phenylisoxazolidine has been formed. - View Dependent Claims (14, 15, 16)
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17. A process which comprises:
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a) adding an aqueous solution of a peroxidic compound to an aqueous solution of dimethylamine and sodium bicarbonate, while maintaining the reaction temperature in the range of about 0°
to about 30°
C. to form a reaction mixture in which N,N-dimethylhydroxylamine has been formed;b) mixing together (i) reaction mixture from a), (ii) a peroxidic compound, and (iii) a transition metal-containing oxidation catalyst, and subjecting the resultant mixture to reaction conditions effective to form a reaction mixture in which N-methylnitrone has been formed; c) mixing together N-methylnitrone from b) and styrene, and subjecting the resultant mixture to reaction conditions effective to produce a reaction mixture in which 2-methyl-5-phenylisoxazolidine has been formed; and d) subjecting 2-methyl-5-phenylisoxazolidine from c) to hydrogenation such that N-methyl-3-phenyl-3-hydroxypropylamine is formed. - View Dependent Claims (18, 19, 20)
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21. A process which comprises:
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a) adding an aqueous solution of a peroxidic compound to an aqueous solution of dimethylamine and sodium bicarbonate, while maintaining the reaction temperature in the range of about 0°
to about 30°
C. to form a reaction mixture in which N,N-dimethylhydroxylamine has been formed;b) mixing together (i) reaction mixture from a), (ii) a peroxidic compound, and (iii) a transition metal-containing oxidation catalyst, and subjecting the resultant mixture to reaction conditions effective to form a reaction mixture in which N-methylnitrone has been formed; c) mixing together N-methylnitrone from b) and styrene, and subjecting the resultant mixture to reaction conditions effective to produce a reaction mixture in which 2-methyl-5-phenylisoxazolidine has been formed; d) subjecting 2-methyl-5-phenylisoxazolidine from c) to hydrogenation such that N-methyl-3-phenyl-3-hydroxypropylamine is formed; and e) mixing together N-methyl-3-phenyl-3-hydroxypropylamine from d) and 4-halobenzotrifluoride, and subjecting the resultant mixture to reaction conditions effective to produce a reaction mixture in which N-methyl-3-phenyl-3- (4-trifluoromethyl)phenoxy!propylamine is formed. - View Dependent Claims (22, 23, 24)
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25. A process which comprises:
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a) adding an aqueous solution of hydrogen peroxide to an aqueous solution of dimethylamine and sodium bicarbonate, while maintaining the reaction temperature in the range of about 0°
to about 30°
C. to form N,N-dimethylhydroxylamine;b) reacting N,N-dimethylhydroxylamine from a) with a peroxidic compound in the presence of an added transition metal-containing oxidation catalyst to form N-methylnitrone; c) reacting N-methylnitrone from b) and styrene to form 2-methyl-5-phenylisoxazolidine; d) hydrogenating 2-methyl-5-phenylisoxazolidine from c) to form N-methyl-3-phenyl-3-hydroxypropylamine; and e) reacting N-methyl-3-phenyl-3-hydroxypropylamine from d) and 4-halobenzotrifluoride to form N-methyl-3-phenyl-3- (4-trifluoromethyl)phenoxy!propylamine.
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26. A process which comprises:
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a) adding an aqueous solution of hydrogen peroxide to an aqueous solution of dimethylamine and sodium bicarbonate, while maintaining the reaction temperature in the range of about 0°
to about 30°
C. to form an N,N-dimethylhydroxylamine-containing reaction mixture; andb) reacting reaction mixture from a) and a peroxidic compound, in the presence of an added transition metal-containing oxidation catalyst, to form a reaction mixture in which N-methylnitrone has been formed. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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Specification