DE3007498A1 - Neue piperidin-derivate mit antihistaminwirkung - Google Patents
Neue piperidin-derivate mit antihistaminwirkungInfo
- Publication number
- DE3007498A1 DE3007498A1 DE19803007498 DE3007498A DE3007498A1 DE 3007498 A1 DE3007498 A1 DE 3007498A1 DE 19803007498 DE19803007498 DE 19803007498 DE 3007498 A DE3007498 A DE 3007498A DE 3007498 A1 DE3007498 A1 DE 3007498A1
- Authority
- DE
- Germany
- Prior art keywords
- hydrogen
- acid
- pharmaceutically acceptable
- carbon atoms
- hydroxyl group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D211/00—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings
- C07D211/04—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D211/06—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
- C07D211/08—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms
- C07D211/18—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms with substituted hydrocarbon radicals attached to ring carbon atoms
- C07D211/20—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms with substituted hydrocarbon radicals attached to ring carbon atoms with hydrocarbon radicals, substituted by singly bound oxygen or sulphur atoms
- C07D211/22—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms with substituted hydrocarbon radicals attached to ring carbon atoms with hydrocarbon radicals, substituted by singly bound oxygen or sulphur atoms by oxygen atoms
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P11/00—Drugs for disorders of the respiratory system
- A61P11/08—Bronchodilators
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P37/00—Drugs for immunological or allergic disorders
- A61P37/08—Antiallergic agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Medicinal Chemistry (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Pharmacology & Pharmacy (AREA)
- Engineering & Computer Science (AREA)
- Animal Behavior & Ethology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Pulmonology (AREA)
- Immunology (AREA)
- Hydrogenated Pyridines (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Plural Heterocyclic Compounds (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/028,813 US4254129A (en) | 1979-04-10 | 1979-04-10 | Piperidine derivatives |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3007498A1 true DE3007498A1 (de) | 1980-10-23 |
| DE3007498C2 DE3007498C2 (enExample) | 1989-09-07 |
Family
ID=21845568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19803007498 Granted DE3007498A1 (de) | 1979-04-10 | 1980-02-28 | Neue piperidin-derivate mit antihistaminwirkung |
Country Status (19)
| Country | Link |
|---|---|
| US (1) | US4254129A (enExample) |
| JP (1) | JPS55141469A (enExample) |
| AT (1) | AT376208B (enExample) |
| AU (1) | AU531146B2 (enExample) |
| BE (1) | BE882703A (enExample) |
| CA (1) | CA1123438A (enExample) |
| CH (1) | CH643245A5 (enExample) |
| DE (1) | DE3007498A1 (enExample) |
| DK (1) | DK153709C (enExample) |
| ES (1) | ES489934A0 (enExample) |
| FR (1) | FR2453854A1 (enExample) |
| IL (1) | IL59158A (enExample) |
| IT (1) | IT1143960B (enExample) |
| NL (2) | NL190580C (enExample) |
| NO (2) | NO154521C (enExample) |
| NZ (1) | NZ192653A (enExample) |
| PH (1) | PH17023A (enExample) |
| SE (1) | SE448726B (enExample) |
| ZA (1) | ZA80332B (enExample) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3917241A1 (de) * | 1989-05-26 | 1990-11-29 | Schaper & Bruemmer Gmbh | 4-(hydroxydiphenylmethyl)-1-piperidyl-phenylalkan-derivate |
| WO1993021156A1 (en) * | 1992-04-10 | 1993-10-28 | Merrell Dow Pharmaceuticals Inc. | 4-diphenylmethyl piperidine derivatives and process for their preparation |
Families Citing this family (115)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AR240018A1 (es) * | 1987-10-07 | 1990-01-31 | Merrell Pharma Inc | Procedimiento para preparar una composicion que comprende derivados de piperidinoalcanol. |
| CN1053570C (zh) | 1987-10-07 | 2000-06-21 | 默尔多药物公司 | 哌啶子基链烷醇的药用组合物-减充血剂复方的制备方法 |
| US4929605A (en) * | 1987-10-07 | 1990-05-29 | Merrell Dow Pharmaceuticals Inc. | Pharmaceutical composition for piperidinoalkanol derivatives |
| US4908372A (en) * | 1988-10-13 | 1990-03-13 | Merrell Dow Pharmaceuticals Inc. | Antihistaminic piperidinyl benzimidazoles |
| AR245888A1 (es) * | 1989-01-23 | 1994-03-30 | Merrell Pharma Inc | Procedimiento para la preparacion de una composicion farmaceutica liquida de derivados de piperidinoalcanol. |
| US5190029A (en) * | 1991-02-14 | 1993-03-02 | Virginia Commonwealth University | Formulation for delivery of drugs by metered dose inhalers with reduced or no chlorofluorocarbon content |
| US5182097A (en) * | 1991-02-14 | 1993-01-26 | Virginia Commonwealth University | Formulations for delivery of drugs by metered dose inhalers with reduced or no chlorofluorocarbon content |
| TW198008B (enExample) * | 1991-04-08 | 1993-01-11 | Green Cross Corp | |
| HU211019B (en) * | 1991-12-02 | 1995-09-28 | Richter Gedeon Vegyeszet | Process for producing new 1,2,3,6-tetrahydropyridine and piperidine derivatives substituted with n-(hydroxylalkyl) group and compositions comprising such compounds |
| CA2129995C (en) * | 1992-02-13 | 2000-04-11 | Albert A. Carr | Piperidinyl thiacyclic derivatives |
| US5631375A (en) * | 1992-04-10 | 1997-05-20 | Merrell Pharmaceuticals, Inc. | Process for piperidine derivatives |
| EP0639976B1 (en) * | 1992-05-11 | 2000-07-26 | Merrell Pharmaceuticals Inc. | Use of terfenadine derivatives as antihistaminics in a hepatically impaired patient |
| WO1994003170A1 (en) * | 1992-08-03 | 1994-02-17 | Sepracor Inc. | Terfenadine metabolites and their optically pure isomers for treating allergic disorders |
| US5654433A (en) * | 1993-01-26 | 1997-08-05 | Merrell Pharmaceuticals Inc. | Process for piperidine derivatives |
| DK1026147T3 (da) * | 1993-06-24 | 2004-03-22 | Albany Molecular Res Inc | Forbindelser, der er anvendelige som mellemprodukter i fremstillingen af piperidinderivater |
| US20020007068A1 (en) * | 1999-07-16 | 2002-01-17 | D'ambra Thomas E. | Piperidine derivatives and process for their production |
| US6147216A (en) * | 1993-06-25 | 2000-11-14 | Merrell Pharmaceuticals Inc. | Intermediates useful for the preparation of antihistaminic piperidine derivatives |
| HU226037B1 (en) * | 1993-06-25 | 2008-03-28 | Aventis Inc | Process for producing antihistaminic 4-diphenylmethyl/diphenylmethoxy piperidine derivatives and novel intermediates |
| WO1995010278A1 (en) * | 1993-10-15 | 1995-04-20 | Hoechst Marion Roussel, Inc. | Treatment of allergic disorders with terfenadine carboxylate |
| US5691352A (en) * | 1993-10-25 | 1997-11-25 | Merrell Pharmaceuticals Inc. | Stable pharmaceutical composition of terfenadine and ibuprofen |
| KR100387459B1 (ko) * | 1994-05-16 | 2003-11-20 | 메렐 파마슈티칼스 인크. | 라세미성a-[4-(1,1-디메틸에틸)페닐]-4-(하이드록시디페닐메틸)-1-피페리딘부탄올및이의유도체화합물의광학분할법및이에유용한부분입체이성체염 |
| CA2585705C (en) * | 1994-05-18 | 2012-04-17 | Aventis Pharmaceuticals Inc. | Processes for preparing anhydrous and hydrate forms of antihistaminic piperidine derivatives, polymorphs and pseudomorphs thereof |
| US20030045722A1 (en) * | 1994-05-18 | 2003-03-06 | Henton Daniel R. | Processes for preparing anhydrous and hydrate forms of antihistaminic piperidine derivatives, polymorphs and pseudomorphs thereof |
| CN101337922A (zh) * | 1994-05-18 | 2009-01-07 | 阿温蒂斯药物公司 | 抗组胺哌啶衍生物,其多晶形物和假同晶物的无水和水合物形式的制备方法 |
| DE69508093T2 (de) | 1994-08-25 | 1999-07-15 | Merrell Pharmaceuticals Inc., Cincinnati, Ohio | Substituierte piperidine für die behandlung von allergischen krankheiten |
| PT812195E (pt) * | 1995-02-28 | 2003-03-31 | Aventis Pharma Inc | Composicao farmaceutica para compostos de piperidinoalcanol |
| JPH11504650A (ja) * | 1995-05-08 | 1999-04-27 | ヘキスト・マリオン・ルセル・インコーポレイテツド | アルファ−(置換アルキルフェニル)−4−(ヒドロキシジフェニルメチル)−1−ピペリジンブタノール誘導体、その製造および抗ヒスタミン剤、抗アレルギー剤および気管支拡張剤としてのその使用 |
| US5574045A (en) * | 1995-06-06 | 1996-11-12 | Hoechst Marion Roussel, Inc. | Oral pharmaceutical composition of piperidinoalkanol compounds in solution form |
| US5906747A (en) * | 1995-11-13 | 1999-05-25 | Biosepra Inc. | Separation of molecules from dilute solutions using composite chromatography media having high dynamic sorptive capacity at high flow rates |
| US6211199B1 (en) | 1995-11-17 | 2001-04-03 | Aventis Pharmaceuticals Inc. | Substituted 4-(1H-benzimidazol-2-yl-amino)piperidines useful for the treatment of allergic diseases |
| US6194406B1 (en) | 1995-12-20 | 2001-02-27 | Aventis Pharmaceuticals Inc. | Substituted 4-(1H-benzimidazol-2-yl)[1,4]diazepanes useful for the treatment of allergic disease |
| US6423704B2 (en) | 1995-12-20 | 2002-07-23 | Aventis Pharmaceuticals Inc. | Substituted 4-(1H-benzimidazol-2-yl)[1,4]diazepanes useful for the treatment of allergic diseases |
| US6153754A (en) * | 1995-12-21 | 2000-11-28 | Albany Molecular Research, Inc. | Process for production of piperidine derivatives |
| US6201124B1 (en) * | 1995-12-21 | 2001-03-13 | Albany Molecular Research, Inc. | Process for production of piperidine derivatives |
| US5922737A (en) * | 1996-02-21 | 1999-07-13 | Hoechst Marion Roussel, Inc. | Substituted N-methyl-N-(4-(4-(1H-Benzimidazol-2-YL-amino) piperidin-1-YL)-2-(arlyl) butyl) benzamides useful for the treatment of allergic diseases |
| US5998439A (en) * | 1996-02-21 | 1999-12-07 | Hoescht Marion Roussel, Inc. | Substituted N-methyl-N-(4-(piperidin-1-yl)-2-(aryl)butyl)benzamides useful for the treatment of allergic diseases |
| US5932571A (en) * | 1996-02-21 | 1999-08-03 | Hoechst Marion Roussel, Inc. | Substituted N-methyl-N-(4-(4-(1H-benzimidazol-2-yl) {1,4}diazepan-1-yl)-2-(aryl) butyl) benzamides useful for the treatment of allergic diseases |
| US5925761A (en) * | 1997-02-04 | 1999-07-20 | Sepracor Inc. | Synthesis of terfenadine and derivatives |
| ATE260983T1 (de) * | 1997-03-11 | 2004-03-15 | Aventis Pharma Inc | Verfahren zur herstellung von 4-(4-(4- (hydroxydiphenyl)-1-piperidinyl)-1-hydroxybutyl - alpha,alpha-dimenthylphenylessigsäure und phosphorylierter derivate |
| ATE224721T1 (de) * | 1997-08-14 | 2002-10-15 | Aventis Pharma Inc | Verfahren zur verbesserung der bioverfügbarkeit des fexofenadins und seiner derivate |
| US6451815B1 (en) | 1997-08-14 | 2002-09-17 | Aventis Pharmaceuticals Inc. | Method of enhancing bioavailability of fexofenadine and its derivatives |
| PT998272E (pt) * | 1997-08-26 | 2003-09-30 | Aventis Pharma Inc | Composicao farmaceutica para combinacao do descongestionante piperidinoalcanol |
| PT924196E (pt) * | 1997-12-17 | 2003-11-28 | Aventis Pharma Gmbh | Procedimento para a alquilacao de derivados de alquil- ou benzilciano em presenca de trialquilaminas ou -fosfinas |
| PL193131B1 (pl) * | 1997-12-23 | 2007-01-31 | Schering Corp | Kompozycja farmaceutyczna zawierająca kombinację składników aktywnych i jej zastosowanie |
| US6194431B1 (en) | 1998-04-14 | 2001-02-27 | Paul D. Rubin | Methods and compositions using terfenadine metabolites in combination with leukotriene inhibitors |
| US6683094B2 (en) | 1998-07-02 | 2004-01-27 | Aventis Pharmaceuticals Inc. | Antihistaminic piperidine derivatives and intermediates for the preparation thereof |
| US6730791B2 (en) | 1998-07-02 | 2004-05-04 | Aventis Pharmaceuticals Inc. | Antihistaminic piperidine derivatives and intermediates for the preparation thereof |
| DK1091938T3 (da) * | 1998-07-02 | 2011-02-07 | Aventisub Ii Inc | Antihistamin piperidinderivativer og mellemprodukter til fremstilling af disse |
| AU2007200674C1 (en) * | 1998-07-02 | 2011-02-24 | Aventisub Llc | Novel antihistaminic piperidine derivatives and intermediates for the preparation thereof |
| GB9822170D0 (en) * | 1998-10-13 | 1998-12-02 | Danbioyst Uk Ltd | Novel formulations of fexofenadine |
| IN191492B (enExample) * | 1999-05-25 | 2003-12-06 | Ranbaxy Lab Ltd | |
| US6613906B1 (en) * | 2000-06-06 | 2003-09-02 | Geneva Pharmaceuticals, Inc. | Crystal modification |
| US6613907B2 (en) | 2000-11-08 | 2003-09-02 | Amr Technology, Inc. | Process for the production of piperidine derivatives with microorganisms |
| CH695216A5 (de) * | 2001-02-23 | 2006-01-31 | Cilag Ag | Verfahren zur Herstellung eines nicht hydratisierten Salzes eines Piperidinderivats und eine so erhältliche neue kristalline Form eines solchen Salzes. |
| US20030021849A1 (en) * | 2001-04-09 | 2003-01-30 | Ben-Zion Dolitzky | Polymorphs of fexofenadine hydrochloride |
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| KR20040015734A (ko) | 2001-06-18 | 2004-02-19 | 닥터 레디스 레보러터리즈 리미티드 | 4-[4-[4-(히드록실디페닐메틸)-1-피페리디닐]-1-히드록시부틸]-α,α-디메틸벤젠 아세트산 및 그 염산염의 신규 결정형태 |
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| CN102659667B (zh) * | 2012-04-20 | 2013-08-14 | 浙江启明药业有限公司 | 一种非索非那定关键中间体的合成方法 |
| CN103333100B (zh) * | 2013-06-06 | 2016-04-06 | 池州东升药业有限公司 | 一种盐酸非索非那定的合成工艺 |
| ITMI20131652A1 (it) | 2013-10-07 | 2015-04-08 | Dipharma Francis Srl | Procedimento per la purificazione di derivati dell'acido 2-fenil-2-metil-propanoico |
| CN104557671B (zh) * | 2013-10-10 | 2018-04-13 | 池州东升药业有限公司 | 一种非索非那定及中间体的合成方法 |
| EP2949321A1 (en) | 2014-05-26 | 2015-12-02 | Sanovel Ilac Sanayi ve Ticaret A.S. | Multilayer formulations of fexofenadine and montelukast |
| US10336698B2 (en) | 2015-01-22 | 2019-07-02 | Sanofi-Aventis Deutschland Gmbh | Process for the production of 2-[4-(cyclopropanecarbonyl)phenyl]-2-methyl-propanenitrile |
| PT3365327T (pt) | 2015-10-22 | 2020-02-06 | Sanofi Aventis Deutschland | Processo para a preparação de fexofenadina e de intermediários usados no mesmo |
| GB2629127A (en) | 2022-08-31 | 2024-10-23 | Novumgen Ltd | An orodispersible tablet of fexofenadine and its process of preparation |
| JP2026501487A (ja) | 2023-01-20 | 2026-01-16 | オペラ ヘルスケア グループ ソシエテ パル アクシオン サンプリフィエ | パラベンフリーフェキソフェナジン製剤 |
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| DE2503362A1 (de) * | 1974-02-08 | 1975-08-21 | Richardson Merrell Inc | Alpha-aryl-4-substituierte piperidinoalkyl-derivate und verfahren zu deren herstellung |
| DE2506770A1 (de) * | 1974-03-04 | 1975-09-11 | Richardson Merrell Inc | Piperidinderivate |
| DE2303306B2 (de) * | 1972-01-28 | 1978-09-28 | Richardson-Merrell Inc., New York, N.Y. (V.St.A.) | Piperidinobutanol-Derivate, Verfahren zu deren Herstellung sowie diese enthaltende pharmazeutische Präparate |
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| GB1242169A (en) * | 1969-04-09 | 1971-08-11 | Ucb Sa | Piperidine derivatives |
| BE794598A (fr) * | 1972-01-28 | 1973-05-16 | Richardson Merrell Inc | Nouveaux derives olefiniques de piperidines substituees en 4 et leur procede de preparation |
| BE794596A (fr) * | 1972-01-28 | 1973-05-16 | Richardson Merrell Inc | Piperidinoalcanone-oximes substituees et leur procede de preparation |
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| US3806526A (en) * | 1972-01-28 | 1974-04-23 | Richardson Merrell Inc | 1-aroylalkyl-4-diphenylmethyl piperidines |
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| US3931197A (en) * | 1974-02-08 | 1976-01-06 | Richardson-Merrell Inc. | Substituted piperidine derivatives |
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| US3956296A (en) * | 1974-12-11 | 1976-05-11 | A. H. Robins Company, Incorporated | 1-Substituted-4-benzylpiperidines |
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- 1980-01-18 NZ NZ192653A patent/NZ192653A/xx unknown
- 1980-01-18 CA CA344,020A patent/CA1123438A/en not_active Expired
- 1980-01-21 ZA ZA00800332A patent/ZA80332B/xx unknown
- 1980-01-29 AU AU55016/80A patent/AU531146B2/en not_active Expired
- 1980-02-07 NL NL8000754A patent/NL190580C/xx not_active IP Right Cessation
- 1980-02-28 DE DE19803007498 patent/DE3007498A1/de active Granted
- 1980-03-05 CH CH174180A patent/CH643245A5/de not_active IP Right Cessation
- 1980-03-17 AT AT0144880A patent/AT376208B/de not_active IP Right Cessation
- 1980-03-24 IT IT48245/80A patent/IT1143960B/it active Protection Beyond IP Right Term
- 1980-03-26 ES ES489934A patent/ES489934A0/es active Granted
- 1980-03-27 DK DK132980A patent/DK153709C/da not_active IP Right Cessation
- 1980-03-28 PH PH23831A patent/PH17023A/en unknown
- 1980-04-08 SE SE8002634A patent/SE448726B/sv not_active IP Right Cessation
- 1980-04-09 NO NO801014A patent/NO154521C/no unknown
- 1980-04-09 JP JP4577180A patent/JPS55141469A/ja active Granted
- 1980-04-09 FR FR8007992A patent/FR2453854A1/fr active Granted
- 1980-04-09 BE BE0/200161A patent/BE882703A/fr not_active IP Right Cessation
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- 1998-05-29 NO NO1998017C patent/NO1998017I1/no unknown
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| DE2303306B2 (de) * | 1972-01-28 | 1978-09-28 | Richardson-Merrell Inc., New York, N.Y. (V.St.A.) | Piperidinobutanol-Derivate, Verfahren zu deren Herstellung sowie diese enthaltende pharmazeutische Präparate |
| DE2503362A1 (de) * | 1974-02-08 | 1975-08-21 | Richardson Merrell Inc | Alpha-aryl-4-substituierte piperidinoalkyl-derivate und verfahren zu deren herstellung |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3917241A1 (de) * | 1989-05-26 | 1990-11-29 | Schaper & Bruemmer Gmbh | 4-(hydroxydiphenylmethyl)-1-piperidyl-phenylalkan-derivate |
| US5077301A (en) * | 1989-05-26 | 1991-12-31 | Schaper & Bruemmer Gmbh & Co. Kg | 4-(hydroxydiphenylmethyl)-1-piperidylphenylalkane derivatives as antihistamines and methods of treatment of an allergic response |
| WO1993021156A1 (en) * | 1992-04-10 | 1993-10-28 | Merrell Dow Pharmaceuticals Inc. | 4-diphenylmethyl piperidine derivatives and process for their preparation |
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