Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C233/00—Carboxylic acid amides
  • C07C233/01—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms
  • C07C233/12—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by halogen atoms or by nitro or nitroso groups

Definitions

• This invention relates to a process for the preparation of 3-amino-5-hydroxybenzoic acids and derivatives and analogues thereof. These compounds are of use in the production of antibiotics by fermentation.
• 3-Amino-5-hydroxybenzoic acid (1) is a naturally occurring amino acid [J J Kibby and R W Rickards, J. Antibiot., 34, 605 (1981)] which functions as a key intermediate in the formation of certain metabolic products of living systems.
• the amino acid (1) has been proved to be an intermediate in the biological synthesis by microorganisms of several important groups of antibiotics, such as antibiotics of the ansamycin [J J Kibby, I A McDonald, and R W Rickards, J. Chem. Soc, Chem. Commun. 768 (1980); 0 Ghisalba and J Niiesch,
• antibiotics include several clinically important representatives, such as the antitubercular agent rifampicin (which is a synthetic modification of the natural ansamycin antibiotic rifamycin S [K L Rinehart, Jr., and L S Shield, Fortschr. Chem. Org. Naturst., 33, 231 (1976)]) and the antitumor agent mitomycin C [R W Franck, Fortschr. Chem. Org. Naturst., 3_8_, 1 (1979)].
• rifampicin which is a synthetic modification of the natural ansamycin antibiotic rifamycin S [K L Rinehart, Jr., and L S Shield, Fortschr. Chem. Org. Naturst., 33, 231 (1976)]
• antitumor agent mitomycin C [R W Franck, Fortschr. Chem. Org. Naturst., 3_8_, 1 (1979)].
• OMPI amino-5-hydroxybenzoic acid In some fermentations th production of 3-amino-5-hydroxybenzoic acid may b limited, either nutritionally or genetically, to th extent that the full potential of the particula microorganism for antibiotic production may not b realised. In these circumstances, the addition o exogenous 3-amino-5-hydroxybenzoic acid to the nie may increase the resultant antibiotic yield.
• 3-alkylamino-5-hydroxybenzoic acids when added to the appropriate fermentation media, may give rise to the production of the corresponding N-alkylated homologues of the antibiotic normally produced from 3- amino-5-hydroxybenzoic acid itself.
• 3- hydroxy-5-methylaminobenzoic acid added to the fermentation media, may result in the increased production of antibiotics such as the maytansinoids [K L Rinehart, Jr., and L S Shield, Fortschr. Chem. Org. Naturst., 33, 231 (1976)], which themselves carry an N-methyl group derived biogenetically from the amino group of the acid (1).
• R 1 represents the radicals -OR2 or -NR3R4;
• R , R , R , R , R and R represent radicals separately selected from hydrogen and alkyl, or the acid addition salts thereof, comprising: a) the reaction of a 3 , 5-dihydroxybenzoic acid of general formula (3):
• R 2 represents alkyl and R3
• R 4 , R 5 , R ⁇ and R are as hereinbefore defined;
• alkyl is used to denote a straight- or branched-chain hydrocarbon radical of 1 to 10 carbon atoms.
• the pressure and temperature conditions required for the reaction of a 3 , 5-dihydroxybenzoic acid of the general formula (3) with a compound of the general formula (4) vary with the nature and quantity of reactants used. Generally, however, it has been found that a temperature range of about 100 C to about 300 C and a pressure range of about 15 p.s.i. to 500 p.s.i. have been satisfactory. In particular, a temperature of about 180 C and a pressure of about 320 p.s.i. have resulted in good yields of the required products.
• R , R and R are separately selected from the group consisting of hydrogen, methyl and ethyl.
• ammonia is replaced by an amine, mono- or disubstituted with alkyl radicals, such as methylamine, ethylamine, or dimethylamine
• alkyl radicals such as methylamine, ethylamine, or dimethylamine
• the corresponding N- alkylated homologues of 3-amino-5-hydroxybenzoic acid (for example, 3-methylamino-, 3-ethylamino-, or 3- dimethylamino-5-hydroxybenzoic acid) can be prepared.
• the preparation of the ester of general formula (2d) can, if desired, provide a means for obtaining pure acid of general formula (2c).
• the crude reaction mixture containing the amide of general formula (2b) or the acid of general formula (2c) is esterified, by conventional techniques, to produce the ester of general formula (2d) which in some cases may be more readily separated from impurities.
• the ester of general formula (2d) is then hydrolysed with acid or base. Adjustment of the pH of the hydrolysis solution precipitates the free amino acid of general formula (2c), or its acid addition salt.
• methanolic sulphuric acid is used to prepare a methyl ester, although other esters can, of course, be employed.
• R , R , R , R and R are as hereinbefore defined.
• antibiotic analogues may also be achieved by direct supplementation of fermentation media with esters of 3-amino-5-hydroxybenzoic acid (1) or its analogues (for example, 3-N-alkylamino-5-hydroxybenzoic acids).
• esters (2d) which are described above may be used directly without hydrolysis.
• OMPI aqueous hydrochloric acid 100ml
• the solutio heated at reflux temperature for 36 h.
• the acidic solution was extracted with ethyl acetate
• the combined organic phases were washed with cold I aqueous hydrochloric acid, then with brine. Dryin (MgSO.) and evaporation of the organic solvent gav starting material (962 mg, 48%).
• the combined aqueou solutions were adjusted to pH 4-5 with solid sodiu bicarbonate, saturated with sodium chloride an extracted with ethyl acetate. Evaporation of the drie extracts gave 3-hydroxy-5-methylaminobenzoic aci (1.052g, 48%), m.p.
• aqueous sodium hydroxide extracts were the acidified to pH 6 under ice-cooling with concentrate phosphoric acid, saturated with sodium chloride, an extracted with ethyl acetate (x 4) . Drying (Na-SO.) and evaporation of the solvent gave 3-hydroxy-5-methyl- aminobenzoic acid (1.17g, 54%), identical with the material described in Example 5.
• m/z_ 196 (M + + H, 15%), 195 (M + , 75), 5 180 (M + -CH 3 , 100), 164 (M + -OMe, 12), 136(10).

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• 1983
  • 1983-08-22 JP JP50274383A patent/JPS59501589A/ja active Pending
  • 1983-08-22 WO PCT/AU1983/000111 patent/WO1984000750A1/en not_active Application Discontinuation
  • 1983-08-22 EP EP83902635A patent/EP0134782A1/en not_active Withdrawn

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