Patent GB-1459307-A (GB)
Title: Triazole-stilbene derivatives
IPC: C08L51/00
Filed: 1974-05-13
Abstract: 1459307 Triazolyl - stilbene derivatives SANDOZ Ltd 13 May 1974 [17 May 1973] 20970/74 Heading C2C Novel optical brightener compounds of formula in which X 1  and X 2 , independently, each signifies hydrogen, chlorine or a group selected from -SO 3 M, -COOM, -SO 2 NR 3 R 4 , -CONR 3 R 4 , -SO 3 R 5 , -CN, -CO 2 R 5  and -SO 2 R 6 , in which either R 3  signifies hydrogen; C 1-6  alkyl, unsubstituted or substituted by hydroxy or phenyl; cyclohexyl; or phenyl, unsubstituted or substituted by one or more substituents selected from halogen, C 1-6  alkyl or alkoxy, cyano or -SO 3 M, and R 4  signifies hydrogen or C 1-6  alkyl, unsubstituted or substituted by hydroxy, or R 3  and R 4 , together with the nitrogen to which they are attached, signify a piperidine, pyrrolidine, morpholine or N-methylpiperazine ring, R 5  signifies C 1-6  alkyl, unsubstituted or substituted by C 1-6  alkoxy; or phenyl, unsubstituted or substituted by one or more substituents selected from C 1-6  alkyl, C 1-6  alkoxy, fluorine, chlorine or cyano, R 6  signifies C 1-6  alkyl, unsubstituted or substituted by hydroxy, C 1-6  alkoxy, C 1-6  hydroxyalkoxy, aminocarbonyl or -SO 3 M; or phenyl, unsubstituted or substituted by one or more substituents selected from C 1-6  alkyl, C 1-6  alkoxy, fluorine, chlorine or cyano, the R 1 s, which are the same, each signify hydrogen; chlorine; C 1-6  alkyl; or phenyl unsubstituted or substituted by one or more substituents selected from C 1-6  alkyl, C 1-6  alkoxy, fluorine, chlorine or phenyl, the R 2 s, which are the same, each signify a radical of Formula (a), (b) or (c) in which Y 1  signifies C 1-6  alkyl; or phenyl, unsubstituted or substituted by one or more substituents selected from C 1-6  alkyl, C 1-6  alkoxy, fluorine, chlorine and -SO 3 M, and X 3  signifies -O- or -NY 5 -, where Y 5  signifies hydrogen or C 1-6  alkyl, unsubstituted or substituted by hydroxy, chlorine or -SO 3 M in which Y 2  signifies naphthyl, unsubstituted or substituted by C 1-6  alkyl, C 1-4  alkoxy or -SO 3 M; or phenyl, unsubstituted or substituted by one or more substituents selected from fluorine, chlorine, C 1-6  alkyl, C 1-6  alkoxy and -SO 3 M, and Y 3  signifies hydrogen; chlorine; C 1-6  alkyl; phenyl, unsubstituted or substituted by one or more substituents selected from C 1-6  alkyl, C 1-6  alkoxy, fluorine, chlorine and -SO 3 M, -COOM, -CONR 3 R 4  or -COOR 5 , and in which Y 4  signifies hydrogen or C 1-6  alkyl, and M signifies hydrogen or a non-chromophoric cation, are prepared by (a) reducing corresponding N-oxides of formula (b) cyclizing where R x  is H or acyl, R 11  is C 1-6  alkyl and R 22  is (c) above; (c) reacting N-oxides of Formula III in which R 1  is H with HCl to give compounds in which R 1  is Cl; (d) cyclizing where Y 11  is alkyl or optionally substituted phenyl; (e) reacting or with an amine Y 5 NH 2 ; (f) sulphonation of phenyl groups. The compounds of formula is prepared by reacting hydrazine hydrate with the corresponding ethoxycarbonyl compound. Compounds of Formula II above in which X 1  and X 2  are SO 3 H, R x  is H and in which R 1  is H and R 2  is 3-pyridyl-, 2-phenyl-4-methyl-vtriazolyl-5- or 3-(2<SP>1</SP>-chlorophenyl)-4-methyl-vtriazolyl-5- or in which R 1  is CH 3  and R 2  is 3-pyridyl are prepared by reacting 4,4<SP>1</SP>-bishydrazino stilbene 2,2<SP>1</SP>-disulphonic acid with R 2 COCR 1 =NOH. Compounds of Formula III above in which X 1  and X 2  are SO 3 H, R 1  is H and R 2  is 2-phenyl- or 2 - (2<SP>1 </SP>- chlorophenyl) - 4 - methyl - v - triazolyl- 5 are prepared by cyclization of compounds of Formula II with copper sulphate in aqueous pyridine. 2 - Phenyl- and 2 - (21 - chlorophenyl)- 4 - methyl - 5 - (α - oximinoacetyl) - v - triazoles are obtained by reacting isopropyl nitrite with the corresponding acetyl compounds.