Patent GB-1326230-A (GB)
Title: Bis aroxazolyl compounds processes for their manufacture and their use
IPC: C07D333/76
Filed: 1970-12-17
Abstract: 1326230 Bis-aroxazolyl compounds CIBAGEIGY AG 17 Dec 1970 [17 Dec 1969] 59978/70 Heading C2C [Also in Divisions C3 and D1] Novel compounds of formula wherein X represents a bridge member -O-, -S- or -SO 2 -, each of T 1  and T 1 <SP>1</SP>, which may be the same or different, denotes hydrogen, a C 1-6  alkyl group, C 1-6  alkoxy group, halogen or sulpho group or a functional derivative thereof, and each of A and A<SP>1</SP>, which may be the same or different, denotes a benzene ring which is unsubstituted or contains up to 4 non-chromophoric substituents, a tetrahydronaphthalene ring or naphthalene ring, which can carry sulphonic acid groups or alkyl or alkoxy groups, or a hydrindene ring preferably of formula wherein X represents a bridge member -O-, -S-, or -SO 2 -, each of R 1  and R 1 , which may be the same or different, denotes hydrogen, alkyl with 1 to 12 carbon atoms, halogen, cyclohexyl, phenylalkyl with 1 to 4 carbon atoms in the alkyl part, phenyl, sulphophenyl, phenylsulphonyl, alkylsulphonyl with 1 to 4 carbon atoms, alkoxy with 1 to 4 carbon atoms, phenoxy, chloro- or fluoro-methyl, carboxyl, carboxylic acid amide, N-alkyl (C 1-18 ) substituted carboxylic acid amide and carboxylic acid alkyl (C 1-18 ) ester, carboxyalkyl with 1 to 4 carbon atoms in the alkyl part, and also carbonamide-alkyl, N-alkyl (C 1-18 ) substituted carbonamide-alkyl (C 1-18 ) and carboxylic acid alkyl (C 1-18 ), ester-alkyl (C 1-18 ), sulphonic acid, sulphonic acid amide, N-alkyl (C 1-18 ) substituted sulphonic acid amide and sulphonic acid alkyl (C 1-18 ) ester, or nitrile, each of R 2  and R 2 <SP>1</SP>, which may be the same or different, denotes hydrogen, an alkyl group with 1 to 5 carbon atoms, chlorine or an alkoxy group with 1 to 4 carbon atoms, each of R 3  and R 3 <SP>1</SP>, which may be the same or different, denotes hydrogen, an alkyl group with 1 to 4 carbon atoms, chlorine or an alkoxy group with 1 to 4 carbon atoms, or R 1  together with R 2  and/or R 1 , together with R 9 <SP>1</SP>, form a fused fivemembered or six-membered, cycloaliphatic carbon ring or a fused benzene ring, and the hydrindene, naphthalene or tetrahydronaphthalene ring systems thereby formed can additionally contain one or more sulphonic acid groups, or a fimctional derivative thereof and each of T 1  and T 1 <SP>1</SP>, which may be the same or different, denotes hydrogen, a lower alkyl group, lower alkoxy group, halogen or a sulpho group, or a functional derivative thereof are prepared by one of the following methods: (a) reacting 2 mols of a compound of either or both formulae with 1 mol of a compound of formula at a temperature between 120 and 350 C. in which A, A<SP>1</SP>, T 1 , T 1 <SP>1</SP> and X are as defined above and each of Z 1  and Z 2 , which may be the same or different, represents a -CN, -COY, or -COY 2  group, in which Y 1  and/or Y 2  denotes a hydroxyl group, halogen atom or a lower alkoxy group, and reacting the product with an oxygencontaining acid of pentavalent phosphorus as a condensation agent, when Z 1  and/or Z 2  represent -C#N, or with a condensation agent having the effect of splitting off water when Z 1  and/or Z 2  is other than CN; or (b) reacting an amide of formula in which Hal represents chlorine or bromine and each of Y 1  and Y 2 , which may be the same or different, represents hydroxyl, halogen or a lower alkoxy group, by cyclizing the above amide to give the corresponding benzoxazole compound in the presence of a polar solvent, a hydrogen halide binding agent and a copper catalyst or (c) cyclizing a compound of formula wherein R is H and U 1 , U 1 <SP>1</SP>, U 2  and U 2 <SP>1</SP> are as R 1 , R 1 <SP>1</SP>, R 2  and R 2 <SP>1</SP> above to give the corresponding benzoxazole derivative and either aimultaneously with the benzoxazole cyclization or in a separate third stage the dibenzofuran ring is closed by heating to a temperature above 250 C. where appropriate under reduced pressure and/or using a powerful agent for splitting off water. A chromophoric group means a group which when present in an aromatic compound gives colour to the compound by causing a displacement of, or appearance of, absorbent bonds in the visible spectrum. Suitable non-chromophoric substituents are halogen, alkyl, cycloalkyl, aralkyl, phenyl, hydroxy, amino, carboxy and sulphonic and functional and substituted derivatives thereof. Intermediates of Formula 30 wherein Z 1  and Z 2  are COCl, are prepared by reacting SOCl 2  with the compound wherein Z 1  and Z 2  are COOH; those wherein Z 1  and Z 2  are CN are obtained by reacting copper cyanide with the diazotised compound wherein Z 1  and Z 2  are amino; and the compounds wherein z 1  and z 2  are -COOH are obtained by hydrolysing the nitrile, by reacting copper with the diazotized compound of formula obtained by reducing the corresponding dinitro compound, or by oxidizing 3,7-dimethyldibenzofuran. Intermediates of formula are prepared by reacting 3-bromo- or 3 hydroxy- 4-amino biphenyl with the dicarboxylic acid chloride. Compound of formula is obtained by reacting the acid of formula with SOCl 2  then with 3-hydroxy-4-aminobiphenyl.  Compound of formula is obtained by reacting 2-amino-4-isopropylphenol with the dicarboxylic acid chloride.