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Journal articles on the topic '3-hydroxypyridines'

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Published: 4 June 2025

Last updated: 1 August 2025

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1

Koch, Volker, and Stefan Schnatterer. "Chemistry of 3-Hydroxypyridine Part 2: Synthesis of 5,6-Dihalo-3-hydroxypyridines." Synthesis 1990, no. 06 (1990): 499–501. http://dx.doi.org/10.1055/s-1990-26919.

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2

Fürst, Michael C. D., Leonard R. Bock, and Markus R. Heinrich. "Regioselective Radical Arylation of 3-Hydroxypyridines." Journal of Organic Chemistry 81, no. 13 (2016): 5752–58. http://dx.doi.org/10.1021/acs.joc.6b00894.

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3

Ito, Kazuya, Takayuki Doi, and Hirokazu Tsukamoto. "De Novo Synthesis of Polysubstituted 3-Hydroxypyridines Via “Anti-Wacker”-Type Cyclization." Catalysts 13, no. 2 (2023): 319. http://dx.doi.org/10.3390/catal13020319.

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We report an efficient method to prepare polysubstituted 3-hydroxypyridines from amino acids, propargyl alcohols, and arylboronic acids. The process involves Pd(0)-catalyzed anti-selective arylative cyclizations of N-propargyl-N-tosyl-aminoaldehydes with arylboronic acids (“anti-Wacker”-type cyclization), oxidation of the resulting 5-substituted-3-hydroxy-1,2,3,6-tetrahydropyridines to 3-oxo derivatives, and elimination of p-toluenesulfinic acid. This method provides diverse polysubstituted 3-hydroxypyridines, whose hydroxy group can be further substituted by a cross-coupling reaction via a tr

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4

Fuss, Andreas, and Volker Koch. "Chemistry of 3-Hydroxypyridine Part 3: Synthesis of Substituted 3-[Fluoro(chloro)alkoxy]pyridines from Halo- or Amino-3-hydroxypyridines." Synthesis 1990, no. 07 (1990): 604–8. http://dx.doi.org/10.1055/s-1990-26956.

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5

Asami, Tadao, Masatoshi Baba, Hiroyuki Koike, Yorinao Inoue, and Shigeo Yoshida. "Halogenation Enhances the Photosystem II Inhibitory Activity of 4-Hydroxypyridines: Structure-Activity Relationships and Their Mode of Action." Zeitschrift für Naturforschung C 48, no. 3-4 (1993): 152–58. http://dx.doi.org/10.1515/znc-1993-3-407.

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Abstract A range of 4-hydroxypyridines were synthesized and their activity as PET inhibitors were investigated with regard to their structural resemblance to plastoquinone in photosynthetic electron transport (PET). The activity of these compounds was markedly enhanced upon modifying their structures: introduction of halogens into both the 3-and 5-positions of the pyridine ring and additional substitution at the α-position of the side chain at 6-position were effective among others in enhancing the activity. Insertion of a phenyl ring into the side chain at 6-position of the pyridine ring also

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6

Kuz'min, V. I., A. S. Losev, I. S. Morozov, et al. "Synthesis and biological activity of 2-phenylethyl-3-hydroxypyridines." Pharmaceutical Chemistry Journal 27, no. 8 (1993): 555–61. http://dx.doi.org/10.1007/bf00779915.

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7

Erhardt, Hellmuth, Kevin A. Kunz, and Stefan F. Kirsch. "Thermolysis of Geminal Diazides: Reagent-Free Synthesis of 3-Hydroxypyridines." Organic Letters 19, no. 1 (2016): 178–81. http://dx.doi.org/10.1021/acs.orglett.6b03475.

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8

Amat-Guerri, F., A. Pajares, J. Gianotti, et al. "Singlet molecular oxygen-mediated photooxidation of 2-substituted 3-hydroxypyridines." Journal of Photochemistry and Photobiology A: Chemistry 126, no. 1-3 (1999): 59–64. http://dx.doi.org/10.1016/s1010-6030(99)00115-x.

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9

Lin, Shaw-Tao, Ling-Ling Tien, Yueh-Hsiung Kuo, and Kae-Shyang Shih. "Mass spectra of 2- and/or 6-alkyl-3-hydroxypyridines." Organic Mass Spectrometry 26, no. 6 (1991): 583–86. http://dx.doi.org/10.1002/oms.1210260609.

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10

Nesterova, Natalia I., Olesya V. Shcheblykina, Pavel D. Kolesnichenko, Arkady V. Nesterov, Dmitry V. Shcheblykin, and Dmitry Yakovlev. "Neuroprotective effects of taurine and 3-hydroxypyridine derivatives in the intracerebral hemorrhage model in rats." Research Results in Pharmacology 5, no. (3) (2019): 87–94. https://doi.org/10.3897/rrpharmacology.5.36988.

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Introduction: At present, the problem of pharmacological correction of free radical processess emerges full-blown. The aim of the study is an experimental study of the neuroprotective effect of taurine and 3-hydroxypyridine derivatives. Materials and methods: The study was performed in Wistar rats. The neuroprotective effect of the substances was studied in the intracerebral hemorrhage model. Results and discussion: The administration of the studied substances had a positive effect on the survival of the animals within the first day (50% of rats died in the control group, 30% – in the Mexidol-

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11

Chapman, Glen M., Stephen P. Stanforth, Brian Tarbit, and Michael D. Watson. "Arylated pyridines: Suzuki reactions of O-substituted 2,6-dihalogenated-3-hydroxypyridines." Journal of the Chemical Society, Perkin Transactions 1, no. 5 (February 1, 2002): 581–82. http://dx.doi.org/10.1039/b111620g.

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12

Yoshida, Kazuhiro, Fumihiro Kawagoe, Kazushi Hayashi, Shingo Horiuchi, Tsuneo Imamoto, and Akira Yanagisawa. "Synthesis of 3-Hydroxypyridines Using Ruthenium-Catalyzed Ring-Closing Olefin Metathesis." Organic Letters 11, no. 3 (2009): 515–18. http://dx.doi.org/10.1021/ol8023117.

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13

Mukherjee, Kana M., and T. N. Misra. "Surface-EnhancedRaman Spectra of 2- and 3-Hydroxypyridines in Silver Sol." Journal of Raman Spectroscopy 27, no. 8 (1996): 595–600. http://dx.doi.org/10.1002/(sici)1097-4555(199608)27:8<595::aid-jrs992>3.0.co;2-a.

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14

Cox, Matthew, Michael Dixon, Troy Lister, and Rolf H. Prager. "Intramolecular Interactions in Carbenes Derived During the Pyrolysis of N-Alkenylisoxazolones." Australian Journal of Chemistry 57, no. 5 (2004): 455. http://dx.doi.org/10.1071/ch03154.

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Flash vacuum pyrolysis of ethyl 3-(3-methyl-5-oxo-2,5-dihydroisoxazole-2-yl)-3-phenylpropenoate yields 4-ethoxy-3-hydroxy-2-methyl-5-phenylpyridine in addition to the expected pyrrole. The structure assignment is based on two-dimensional NMR and computational evidence. The pyrolysis of the corresponding dimethyl amide gives a mixture of three 3-hydroxypyridines, in addition to the pyrrole. Evidence is presented for the formation of intermediate 1,4-oxazepines by a six-electron electrocyclic reaction of a carbene with ester or amide carbonyl groups.

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15

Lu, Jin-Yong, and Hans-Dieter Arndt. "Hetero Diels−Alder Synthesis of 3-Hydroxypyridines: Access to the Nosiheptide Core." Journal of Organic Chemistry 72, no. 11 (2007): 4205–12. http://dx.doi.org/10.1021/jo0703505.

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16

Altman, Ryan A., and Stephen L. Buchwald. "Cu-CatalyzedN- andO-Arylation of 2-, 3-, and 4-Hydroxypyridines and Hydroxyquinolines." Organic Letters 9, no. 4 (2007): 643–46. http://dx.doi.org/10.1021/ol062904g.

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17

KUO, Yueh-Hsiung, and Kae-Shyang SHIH. "A new method for preparation of 3-hydroxypyridines from furfurylamines by photooxygenation." CHEMICAL & PHARMACEUTICAL BULLETIN 39, no. 1 (1991): 181–83. http://dx.doi.org/10.1248/cpb.39.181.

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18

Chapman, Glen M., Stephen P. Stanforth, Brian Tarbit, and Michael D. Watson. "ChemInform Abstract: Arylated Pyridines: Suzuki Reactions of O-Substituted 2,6-Dihalogenated-3-hydroxypyridines." ChemInform 33, no. 30 (2010): no. http://dx.doi.org/10.1002/chin.200230175.

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19

Korobeinicheva, I. K., V. F. Sedova, S. B. Gashev, L. D. Smirnov, O. V. Yagodina, and V. P. Mamaev. "UV spectroscopic study of the acid-base reactions of 3-hydroxypyridines and 5-hydroxypyrimidines." Chemistry of Heterocyclic Compounds 25, no. 8 (1989): 913–19. http://dx.doi.org/10.1007/bf00479612.

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20

KUO, Y. H., and K. S. SHIH. "ChemInform Abstract: A New Method for Preparation of 3-Hydroxypyridines from Furfurylamines by Photooxygenation." ChemInform 22, no. 43 (2010): no. http://dx.doi.org/10.1002/chin.199143145.

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21

Chubb, Richard W. J., Martin R. Bryce, and Brian Tarbit. "Synthesis of 2-heteroaryl-3-hydroxypyridines by ring expansion reactions of 2-acylfurans with ammonia." Journal of the Chemical Society, Perkin Transactions 1, no. 16 (2001): 1853–54. http://dx.doi.org/10.1039/b105228b.

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22

Muranov, K. O., N. B. Polyanskii, A. A. Shvedova, V. E. Kagan, and L. D. Smirnov. "Effect of 3-hydroxypyridines on cyclic nucleotide levels and inhibition of platelet aggregation in man." Bulletin of Experimental Biology and Medicine 102, no. 4 (1986): 1378–80. http://dx.doi.org/10.1007/bf00851053.

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23

Itov, Z. I., and V. I. Gunar. "Synthesis of 3-hydroxypyridines by condensation of 4-methyl-5-hydroxyoxazole derivatives with ethyl ?-cyanoacrylate." Pharmaceutical Chemistry Journal 22, no. 5 (1988): 402–4. http://dx.doi.org/10.1007/bf00769658.

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24

Bromidge, Steven M., David A. Archer, and Peter G. Sammes. "Preparation of 2-Substituted 3-Hydroxypyridines and Direct Conversion of 2-Furyl Ketone into a Perhydroazulene." Synthesis 1992, no. 07 (1992): 645–47. http://dx.doi.org/10.1055/s-1992-26187.

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25

Jouanno, Laurie-Anne, Vincent Tognetti, Laurent Joubert, Cyrille Sabot, and Pierre-Yves Renard. "Thermally Controlled Decarboxylative [4 + 2] Cycloaddition between Alkoxyoxazoles and Acrylic Acid: Expedient Access to 3-Hydroxypyridines." Organic Letters 15, no. 10 (2013): 2530–33. http://dx.doi.org/10.1021/ol4010195.

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26

Shcheblykina, Olesya V., Dmitry V. Shcheblykin, Konstantin S. Trunov, Anton P. Danilenko, and Vladimir S. Lipatov. "Experimental study of new derivatives of 3-hydroxypyridine as pharmacological agents for the correction of ischemic brain injury after intracerebral hemorrhage." Research Results in Pharmacology 8, no. (1) (2022): 71–83. https://doi.org/10.3897/rrpharmacology.8.80378.

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Introduction: Limiting the action of secondary injury factors can improve the prognosis in acute cerebral accidents. The aim of the investigation is to study the neuroprotective effects of 3-hydroxypyridine derivatives. Materials and methods: The study was performed in Wistar rats. An intracerebral hemorrhage (ICH) model was used. The animals were once administered intraperitoneally with the test drugs 1 hour before the surgery and on the 1<sup>st</sup>, 2<sup>nd</sup> and 3<sup>rd</sup> days. The registration of behaviors and condition of the animals on days 1, 3, 7 and 14 and the morphologic

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27

Sabot, Cyrille, Emilia Oueis, Xavier Brune, and Pierre-Yves Renard. "Synthesis of polysubstituted 3-hydroxypyridines via the revisited hetero-Diels–Alder reaction of 5-alkoxyoxazoles with dienophiles." Chem. Commun. 48, no. 5 (2012): 768–70. http://dx.doi.org/10.1039/c1cc16562c.

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28

Hidalgo, Francisco J., Cristina M. Lavado-Tena, and Rosario Zamora. "Formation of 3-hydroxypyridines by lipid oxidation products in the presence of ammonia and ammonia-producing compounds." Food Chemistry 328 (October 2020): 127100. http://dx.doi.org/10.1016/j.foodchem.2020.127100.

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29

Takahashi, Daisuke, Koji Nakabayashi, Shu Tanaka, and Shin-ichi Ohkoshi. "Two-dimensional octacyano-bridged Mn(II)–Nb(IV) bimetal assembly with four different configurations of 3-hydroxypyridines." Inorganic Chemistry Communications 27 (January 2013): 47–50. http://dx.doi.org/10.1016/j.inoche.2012.09.021.

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30

Chubb, Richard W. J., Martin R. Bryce, and Brian Tarbit. "ChemInform Abstract: Synthesis of 2-Heteroaryl-3-hydroxypyridines by Ring Expansion Reactions of 2-Acylfurans with Ammonia." ChemInform 32, no. 50 (2010): no. http://dx.doi.org/10.1002/chin.200150129.

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31

Jouanno, Laurie-Anne, Vincent Tognetti, Laurent Joubert, Cyrille Sabot, and Pierre-Yves Renard. "ChemInform Abstract: Thermally Controlled Decarboxylative [4 + 2] Cycloaddition Between Alkoxyoxazoles and Acrylic Acid: Expedient Access to 3-Hydroxypyridines." ChemInform 44, no. 37 (2013): no. http://dx.doi.org/10.1002/chin.201337131.

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32

BROMIDGE, S. M., D. A. ARCHER, and P. G. SAMMES. "ChemInform Abstract: Preparation of 2-Substituted 3-Hydroxypyridines and Direct Conversion of 2-Furyl Ketone into a Perhydroazulene." ChemInform 23, no. 46 (2010): no. http://dx.doi.org/10.1002/chin.199246177.

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33

Jouanno, Laurie-Anne, Vincent Di Mascio, Vincent Tognetti, Laurent Joubert, Cyrille Sabot, and Pierre-Yves Renard. "Metal-Free Decarboxylative Hetero-Diels–Alder Synthesis of 3-Hydroxypyridines: A Rapid Access to N-Fused Bicyclic Hydroxypiperidine Scaffolds." Journal of Organic Chemistry 79, no. 3 (2014): 1303–19. http://dx.doi.org/10.1021/jo402729a.

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34

Sabot, Cyrille, Emilia Oueis, Xavier Brune, and Pierre-Yves Renard. "ChemInform Abstract: Synthesis of Polysubstituted 3-Hydroxypyridines via the Revisited Hetero-Diels-Alder Reaction of 5-Alkoxyoxazoles with Dienophiles." ChemInform 43, no. 20 (2012): no. http://dx.doi.org/10.1002/chin.201220146.

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35

Wijaya, Karna, Oliver Moers, Armand Blaschette, and Peter G. Jones. "Polysulfonylamine, CXII. Neues aus der Festkörperchemie der 2-Pyridone: Isolierung und Röntgenstrukturen von Bis(2-pyridon)hydrogen(I)- und Bis(6-methyl-2-pyridon)hydrogen(I)-dimesylamid / Polysulfonylamines, CXII. A Novel Solid-State Aspect of 2-Pyridones: Isolation and X-Ray Structures of Bis(2-pyridone)hydrogen(I) and Bis(6-methyl-2-pyridone)hydrogen(I) Dimesylamides." Zeitschrift für Naturforschung B 54, no. 5 (1999): 643–48. http://dx.doi.org/10.1515/znb-1999-0512.

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The compounds (2-pyridone)2H+(MeSO2)2N- (1, monoclinic, space group P21/n ) and (6- methyl-2-pyridone)2H+(MeSO2)2N- (2, triclinic, P1) crystallize selectively and in good yields when the parent 2-pyridones (2-hydroxypyridines) are treated with the strong NH acid dimesylamine in acetonitrile or acetone. The corresponding 2-hydroxypyridinium salts could not be obtained. In the unprecedented crystal structures of 1 and 2, two pyridone units are linked by a proton to form very short and approximately symmetric O⋯H+ ⋯O hydrogen bonds, the adjacent C-O distances being appreciably elongated as compar

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36

Jouanno, Laurie-Anne, Vincent Di Mascio, Vincent Tognetti, Laurent Joubert, Cyrille Sabot, and Pierre-Yves Renard. "ChemInform Abstract: Metal-Free Decarboxylative Hetero-Diels-Alder Synthesis of 3-Hydroxypyridines: A Rapid Access to N-Fused Bicyclic Hydroxypiperidine Scaffolds." ChemInform 45, no. 29 (2014): no. http://dx.doi.org/10.1002/chin.201429176.

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37

Krivoruchko, Anastasiia, Maria Kuyukina, Tatyana Peshkur, Colin J. Cunningham, and Irina Ivshina. "Rhodococcus Strains from the Specialized Collection of Alkanotrophs for Biodegradation of Aromatic Compounds." Molecules 28, no. 5 (2023): 2393. http://dx.doi.org/10.3390/molecules28052393.

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The ability to degrade aromatic hydrocarbons, including (i) benzene, toluene, o-xylene, naphthalene, anthracene, phenanthrene, benzo[a]anthracene, and benzo[a]pyrene; (ii) polar substituted derivatives of benzene, including phenol and aniline; (iii) N-heterocyclic compounds, including pyridine; 2-, 3-, and 4-picolines; 2- and 6-lutidine; 2- and 4-hydroxypyridines; (iv) derivatives of aromatic acids, including coumarin, of 133 Rhodococcus strains from the Regional Specialized Collection of Alkanotrophic Microorganisms was demonstrated. The minimal inhibitory concentrations of these aromatic com

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38

Voronina, T. A., L. D. Smirnov, U. M. Tilekeeva, and K. M. Dyumaev. "Role of the GABA-benzodiazepine-receptor complex in the mechanism of the anxtolytic action of 3-hydroxypyridines ? New tranquilizers with a nonbenzodiazepine structure." Bulletin of Experimental Biology and Medicine 101, no. 5 (1986): 624–26. http://dx.doi.org/10.1007/bf00835881.

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39

SHASHI, K. BANSAL, and S. SINDHU R. "Polarographic Behaviour of Xanthate Anions as Salts of 2,3-Dihydroxypyridine and 2-Amino-3-hydroxypyridinebis (cyclopentadienyl) titanium(Iv) and -zirconium(Iv) Chelates." Journal of Indian Chemical Society Vol.71, Jan 1994 (1994): 39–40. https://doi.org/10.5281/zenodo.5891034.

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Chemistry Department, Regional College of Education, A.Jmer-305 004 <em>Manuscrtpt received 18 August 1992, revised 5 April 1993, accepted 13 Apnl 1993</em> Polarographic Behaviour of Xanthate Anions as Salts of 2,3-Dihydroxypyridine and 2-Amino-hydroxypyridinebis(cyclopentadienyl)titanium(Iv) and -zirconium(Iv) Chelates

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40

Кузнецова, Эмма, Emma Kuznetsova, Виктория Горохова, et al. "INTERACTION OF ERYTHROCYTE MEMBRANES WITH DERIVATIVES OF 3-OXYPIRIDINES." Acta biomedica scientifica 2, no. 5 (2018): 60–64. http://dx.doi.org/10.12737/article_5a3a0dbe2be5a0.22172442.

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In connection with the increased interest in the use of auto-erythrocytes for directional drug transport, the study of the ability of erythrocytes to sorb an antioxidant drug is becoming topical. The article considers the method of spectro- photometry developed for evaluating the ability of erythrocytes to load with a mexidol preparation under conditions of natural sorption and a method created for determining the drug concentration in erythrocyte biological medias. Materials and methods. The peripheral blood of 15 clinically healthy males aged 20 to 45 years was used a

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41

Koch, Volker, and Stefan Schnatterer. "Chemistry of 3-Hydroxypyridine Part 1: Bromination and Iodination of 3-Hydroxypyridine." Synthesis 1990, no. 06 (1990): 497–98. http://dx.doi.org/10.1055/s-1990-26918.

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42

Gao, Shan, Xian-Fa Zhang, Li-Hua Huo, Zhen-Zhong Lu, Hui Zhao, and Jing-Gui Zhao. "Dichlorotetrakis(3-hydroxypyridine)cobalt(II)." Acta Crystallographica Section E Structure Reports Online 60, no. 8 (2004): m1128—m1130. http://dx.doi.org/10.1107/s160053680401712x.

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43

Nifant'ev, �. E., M. A. Kharshan, A. N. Khailova, V. I. Kuz'min, and E. E. Milliaresi. "Synthesis of 3-hydroxypyridine phosphates." Chemistry of Heterocyclic Compounds 24, no. 1 (1988): 112. http://dx.doi.org/10.1007/bf00475585.

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44

Prins, D. A. "The methylation of 3-hydroxypyridine." Recueil des Travaux Chimiques des Pays-Bas 76, no. 1 (2010): 58–64. http://dx.doi.org/10.1002/recl.19570760107.

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45

Den Hertog, H. J., F. R. Schepman, J. de Bruyn, and G. J. E. Thysse. "Bromo-derivatives of 3-hydroxypyridine." Recueil des Travaux Chimiques des Pays-Bas 69, no. 10 (2010): 1281–88. http://dx.doi.org/10.1002/recl.19500691011.

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46

Hsieh, Yih-Huang, Noham Weinberg, and Saul Wolfe. "Co-operative hydration of the carbonyl group — "Bifunctional catalysis" by 2-hydroxypyridine is achieved via a dihydrate of 2-pyridone." Canadian Journal of Chemistry 86, no. 2 (2008): 81–90. http://dx.doi.org/10.1139/v07-074.

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Although 2-hydroxypyridine is one thousand times less acidic than its isomer 3-hydroxypyridine and ten million times less acidic than acetic acid, in the aqueous hydration of 1 mol/L acetone at 298 K the catalytic effect of added 2-hydroxypyridine is 600 000 times greater than that of 3-hydroxypyridine and 20 times greater than that of acetic acid. This experimental result is successfully reproduced by a theoretical treatment that assumes that solvent molecules participate in a cyclic cooperative mechanism that avoids the formation of charged intermediates. However, the theoretical treatment d

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47

Kuzmicheva, O. V., D. V. Uskalova, D. T. Degtyareva, T. V. Ulanova, S. V. Shkavrov, and E. I. Sarapultseva. "Analysis of the radioprotective properties of 3-hydroxypyridine fumarate on an invertebrate animal model after proton irradiation in vivo." Radiatsionnaya Gygiena = Radiation Hygiene 18, no. 1 (2025): 27–37. https://doi.org/10.21514/1998-426x-2025-18-1-27-37.

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The purpose of the article is to analyze the radio protective and antioxidant properties of 3-hydroxypyridine fumarate in interaction with proton irradiation on a model test organism from the suborder Daphnia magna crustaceans in vivo. The salt of 3-hydroxypyridine fumarate synthesized by the authors was a white crystalline substance soluble in alcohol and water – a mixture of 2-ethyl-6-methyl-3-hydroxypyridine and fumaric acid in ethanol. Acute irradiation of the test organism was carried out on the Prometheus proton complex at the А. Tsyb Medical Radiological Research Center (Obninsk, Russia

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48

Zhang, Xian-Fa, Shan Gao, Li-Hua Huo, Zhen-Zhong Lu та Hui Zhao. "Dichlorotetrakis(3-hydroxypyridine-κN)nickel(II)". Acta Crystallographica Section E Structure Reports Online 60, № 10 (2004): m1367—m1369. http://dx.doi.org/10.1107/s1600536804021245.

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49

Kuz’mina, LyudmilaG, AlexanderA Bagatur’yants, JudithA K. Howard, et al. "Weak interactions and tautomerism in 3,5-dinitrosubstituted 2- and 4-hydroxypyridines and products of their reaction with [O(AuPPh3)3]BF4: synthesis, X-ray structure, IR and UV spectroscopy, and quantum chemical calculations." Journal of Organometallic Chemistry 575, no. 1 (1999): 39–50. http://dx.doi.org/10.1016/s0022-328x(98)00949-8.

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50

Burnett, Christina L., Wilma F. Bergfeld, Donald V. Belsito, et al. "Safety Assessment of 2-Amino-3-Hydroxypyridine as Used in Cosmetics." International Journal of Toxicology 39, no. 2_suppl (2020): 91S—97S. http://dx.doi.org/10.1177/1091581820952376.

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The Expert Panel for Cosmetic Ingredient Safety (Panel) reviewed the safety of 2-Amino-3-Hydroxypyridine, which is reported to function as an oxidative hair dye ingredient. The Panel reviewed relevant animal and human data provided in this safety assessment, and concluded that 2-Amino-3-Hydroxypyridine is safe in the present practices of use and concentration for use in oxidative hair dye formulations.

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