Process for preparing arylalkynes
View Patent ↗The invention relates to a process for preparing arylvinyl halides and sulphonates and arylalkynes by reacting haloaromatics or aryl sulphonates with vinyl halides or sulphonates in the presence of a palladium catalyst and a base and, if appropriate, subsequent elimination.
1. Process for arylalkynes, comprising:
in a step A)
reacting compounds of the formula (I),
Ar—[X] n (I),
where
n is one or two and
Ar is a substituted or unsubstituted aromatic or substituted or unsubstituted polyaromatic radical and
X is, in each case independently, chlorine, bromine, iodine, a sulphonate or a diazonium salt,
in the presence of a palladium catalyst and
in the presence of at least one base;
with compounds of the formula (II),
where
Y is fluorine, chlorine, bromine, iodine, (C 1 -C 12 -alkyl)sulphonyloxy or (C 1 -C 12 -haloalkyl)sulphonyloxy and
R 1 is hydrogen, cyano, C 1 -C 12 -alkyl, C 5 -C 14 -aryl, fluorine, chlorine, COO(C 5 -C 14 -aryl), COO(C 1 -C 12 -alkyl), CON(C 5 -C 14 -aryl) 2 , CON(C 1 -C 12 -alkyl) 2 , OCO(C 5 -C 14 -aryl) or OCO(C 1 -C 12 -alkyl),
to form compounds of the formula (III),
and in a step B)
reacting the compounds of the formula (III) with a base to convert it into compounds of the formula (IV).
Ar—≡—R 1 (IV).
2. Process according to claim 1 , characterized in that step A) is carried out in the presence of a salt.
3. Process according to claim 1 , characterized in that step A) is carried out in the presence of solvents.
4. Process according to claim 1 , characterized in that Ar is a carbocyclic aromatic radical having from 6 to 24 skeletal carbon atoms, a carbocyclic bisaromatic or trisaromatic radical having from 6 to 10 carbon atoms per aromatic radical or a heteroaromatic radical having from 5 to 24 skeletal atoms in which no, one, two or three skeletal atoms per ring, but at least one skeletal atom in the total molecule, is/are heteroatoms selected from the group consisting of nitrogen, sulphur and oxygen, where the carbocyclic aromatic radical, the carbocyclic bisaromatic or trisaromatic radical or the heteroaromatic radical is optionally substituted by up to 5 identical or different substituents per ring which are selected from the group consisting of hydroxy, chlorine, fluorine, nitro, cyano, free or protected formyl, C 1 -C 12 -alkyl, C 5 -C 14 -aryl, C 6 -C 15 -arylalkyl, —PO—[(C 1 -C 8 )-alkyl] 2 , —PO—[(C 5 -C 14 )-aryl] 2 , —PO—[(C 1 -C 8 )-alkyl)(C 5 -C 14 ) -aryl)], tri(C 1 -C 8 -alkyl)siloxyl and radicals of the formulae (Va-f),
A—B—D—E (Va)
A—E (Vb)
A—SO 2 —E (Vc)
A—B—SO 2 R 3 (Vd)
A—SO 3 W (Ve)
A—COW (Vf)
in which, independently of one another,
A is absent or is a C 1 -C 8 -alkylene radical and
B is absent or is oxygen, sulphur or NR 2 ,
where R 2 is hydrogen, C 1 -C 8 -alkyl, C 6 -C 15 -arylalkyl or C 5 -C 14 -aryl, and
D is a carbonyl group and
E is R 3 , OR 3 , NHR 4 or N(R 4 ) 2 ,
where R 3 is C 1 -C 8 -alkyl, C 6 -C 15 -arylalkyl, C 1 -C 8 -haloalkyl or C 5 -C 14 -aryl and
R 4 are each, independently of one another, C 1 -C 8 -alkyl, C 6 -C 15 -arylalkyl or C 5 -C 14 -aryl, or N(R 4 ) 2 represents a cyclic amino radical and
W is OH, NH 2 , or OM where M can be an alkali metal ion, half an equivalent of an alkaline earth metal ion, an ammonium ion or an organic ammonium ion.
5. Process according to at claim 1 , characterized in that X is chlorine, bromine, iodine, trifluoromethanesulphonyloxy or nonafluorobutanesulphonyloxy.
6. Process according to claim 1 , characterized in that Y is fluorine, chlorine, bromine, iodine, methanesulphonyloxy, p-toluenesulphonyloxy, trifluoromethanesulphonyloxy or nonafluorobutanesulphonyloxy.
7. Process according to claim 1 , characterized in that R 1 is hydrogen, cyano, C 1 -C 12 -alkyl, C 5 -C 14 -aryl, fluorine, chlorine, COO(C 5 -C 14 -aryl), COO(C 1 -C 12 -alkyl), OCO(C 5 -C 14 -aryl) or OCO(C 1 -C 12 -alkyl).
8. Process according to claim 1 , characterized in that compounds of the formula (II) used are vinyl fluoride, vinyl chloride, vinyl bromide, 2-chloroacrylonitrile, methyl 2-chloroacrylate, butyl 2-chloroacrylate, 1,1-dichloroethylene, 1,1-difluoroethylene or 4-(1-chloroethenyl)-1,5-dimethyl-3-(trifluoromethyl)-1H-pyrazole.
9. Process according to claim 1 , characterized in that palladium complexes generated in the reaction solution from suitable ligands or palladium complexes which have previously been isolated are used as palladium catalyst.
10. Process according to claim 1 , characterized in that bases used are ionic bases, amines or N-heteroaromatic compounds.
11. Process according to claim 1 , characterized in that free-radical inhibitors are added in step A).
12. Process according to claim 1 , characterized in that bases used are alkaline earth metal or alkali metal hydrides, hydroxides, amides, alkoxides, tertiary amines and/or N-heteroaromatic compounds.
13. Process according to claim 1 , characterized in that 4-ethynyl-1,5-dimethyl-3-(trifluoromethyl)-1H-pyrazole, is prepared.
14. Process according to claim 1 , wherein the palladium catalyst is selected from palladium catalyst of formula (VIa):
[PdL 2 An 2 ] (VIa)
wherein
L are each a monophosphorous compound; or
L 2 together are a diphosphorous compound; and
An is an anion selected from chloride, bromide, acetate, propionate, allyl, and/or cyclopentadiene;
and formula (VIb):
[PdL m ] (VIb)
wherein
L is a monophosphorous or half equivalent of a diphosphorous compound; and
m is 2, 3, or 4.
15. Process according to claim 14 , characterized in that step A) is carried out In the presence of a salt.
16. Process according to claim 14 , characterized in that step A) is carried out in the presence of solvents.
17. Process according to claim 14 , characterized in that Ar is a carbocyclic aromatic radical having from 6 to 24 skeletal carbon atoms, a carbocyclic bisaromatic or trisaromatic radical having from 6 to 10 carbon atoms per aromatic radical or a heteroaromatic radical having from 5 to 24 skeletal atoms in which no, one, two or three skeletal atoms per ring, but at least one skeletal atom in the total molecule, is/are heteroatoms selected from the group consisting of nitrogen, sulphur and oxygen, where the carbocyclic aromatic radical, the carbocyclic bisaromatic or trisaromatic radical or the heteroaromatic radical is optionally substituted by up to 5 identical or different substituents per ring which are selected from the group consisting of hydroxy, chlorine, fluorine, nitro, cyano, free or protected formyl, C 1 -C 12 -alkyl, C 5 -C 14 -aryl, C 6 -C 15 -arylalkyl, -PO-[(C 1 -C 8 )-alkyl] 2 , -PO-[(C 5 -C 14 )-aryl] 2 , -PO-[(C 1 -C 8 )-alkyl)(C 5 -C 14 )-aryl)], tri(C 1 -C 8 -alkyl)siloxyl and radicals of the formulae (Va-f),
A-B-D-E (Va)
A-E (Vb)
A-SO 2 -E (Vc)
A-B-SO 2 R 3 (Vd)
A-SO 3 W (Ve)
A-COW (Vf)
in which, independently of one another,
A is absent or is a C 1 -C 8 -alkylene radical and
B is absent or is oxygen, sulphur or NR 2 ,
where R 2 is hydrogen, C 1 -C 8 -alkyl, C 6 -C 15 -arylalkyl or C 5 -C14-aryl, and
D is a carbonyl group and
E is R 3 , OR 3 , NHR 4 or N(R 4 ) 2 ,
where R 3 is C 1 -C 8 -alkyl, C 6 C 15 -arylalkyl, C 1 -C 8 -haloalkyl or C 5 -C 14 -aryl and
R 4 are each, independently of one another, C 1 -C 8 -alkyl, C 6 -C 15 -arylalkyl or C 5 -C 14 -aryl, or N(R 4 ) 2 represents a cyclic amino radical and
W is OH, NH 2 , or OM where M can be an alkali metal ion, half an equivalent of an alkaline earth metal ion, an ammonium ion or an organic ammonium ion.
18. Process according to at claim 14 , characterized in that X is chlorine, bromine, iodine, trifluoromethanesulphonyloxy or nonafluorobutanesulphonyloxy.
19. Process according to claim 14 , characterized in that Y is fluorine, chlorine, bromine, iodine, methanesulphonyloxy, p-toluenesulphonyloxy, trifluoromethanesulphonyloxy or nonafluorobutanesulphonyloxy.
20. Process according to claim 14 , characterized in that R 1 is hydrogen, cyano, C 1 -C 12 -alkyl, C 5 -C 14 -aryl, fluorine, chlorine, COO(C 5 -C 14 -aryl), COO(C 1 -C 2 -alkyl), OCO(C 5 -C 14 -aryl) or OCO(C 1 -C 12 -alkyl).
21. Process according to claim 14 , characterized in that compounds of the formula (II) used are vinyl fluoride, vinyl chloride, vinyl bromide, 2-chloroacrylonitrile, methyl 2-chloroacrylate, butyl 2-chloroacrylate, 1,1-dichloroethylene, 1,1-dlfluoroethylene or 4-(1-chloroethenyl)-1,5-dimethyl-3-(trifluoromethyl)-1H-pyrazole.
22. Process according to claim 14 , characterized in that palladium complexes generated in the reaction solution from suitable ligands or palladium complexes which have previously been isolated are used as palladium catalyst.
23. Process according to claim 14 , characterized in that bases used are ionic bases, anilnes or N-heteroaromatic compounds.
24. Process according to claim 14 , characterized in that free-radical inhibitors are added in step A).
25. Process according to claim 14 , characterized in that bases used are alkaline earth metal or alkali metal hydrides, hydroxides, amides, alkoxides, tertiary amines and/or N-heteroaromatic compounds.
26. Process according to claim 14 , characterized in that 4-ethynyl-1,5-dimethyl-3-(trifluoromethyl)-1H pyrazole is prepared.