Chemistry:Tiflorex

Short description: Never marketed appetite suppressant

Tiflorex
Clinical data

ATC code	none
Identifiers
IUPAC name (RS)-N-ethyl-1-{3-[(trifluoromethyl)thio]phenyl}propan-2-amine
CAS Number	53993-67-2^Y
PubChem CID	173669
ChemSpider	151574^N
UNII	EG3B69DFQ5
Chemical and physical data
Formula	C₁₂H₁₆F₃NS
Molar mass	263.32 g·mol⁻¹
3D model (JSmol)	Interactive image
Chirality	Racemic mixture
SMILES CCNC(C)Cc1cccc(c1)SC(F)(F)F
InChI InChI=1S/C12H16F3NS/c1-3-16-9(2)7-10-5-4-6-11(8-10)17-12(13,14)15/h4-6,8-9,16H,3,7H2,1-2H3^N Key:HNONSDNCRNUTCT-UHFFFAOYSA-N^N
^NY (what is this?) (verify)

Tiflorex (TFX), formerly known as flutiorex, is a stimulant^{[citation needed]} amphetamine that was under development as an appetite suppressant in the 1970s,^[1]^[2] but appears to have been abandoned. It is structurally related to fenfluramine and 4-MTA.

Tiflorex went to phase II clinical trials. The extended release formulation "TFX-SR" produced significant suppression of appetite. It also caused slightly more sleep disturbances and headaches than placebo, as well as mydriasis and a self-reported decrease in arousal. It had little effect on heart rate.^[2]

Tifluorex is claimed to be a more potent anorectic than fenfluramine, with twice its potency in humans^[2] and 4 times its potency in rats.^[3]

Pharmacology

Pharmacodynamics

The mechanism of action of tiflorex has apparently never been studied. Similar compounds such as fenfluramine, norfenfluramine and 4-MTA act as selective serotonin releasing agents and 5-HT₂ receptor agonists. Fenfluramine in particular causes very similar side effects and appetite suppression at therapeutically relevant doses.

Pharmacokinetics

In rats, tiflorex is rapidly N-dealkylated to norflutiorex. Both tiflorex and norflutiorex appear to be excreted in urine.^[1]

Synthesis

Patent:^[4]

The Rosenmund reduction of 3-(trifluoromethylthio)benzoyl chloride [51748-28-8] (1) gave 3-((trifluoromethyl)thio)benzaldehyde [51748-27-7] (2). Henry reaction with nitroethane led to 1-(2-nitroprop-1-en-1-yl)-3-[(trifluoromethyl)sulfanyl]benzene [176242-84-5] (3). With the aid of iron catalyst in concentrated HCl acid there occurred FGI into 1-(3'-trifluoromethylthiophenyl)-2-propanone, CID:21325269 (4'). Reductive amination with ethylamine and formic acid as the reductant completed the synthesis of tiflorex (5).

References

↑ ^1.0 ^1.1 "Preliminary assessment of flutiorex, a new anorectic drug, in man". British Journal of Clinical Pharmacology 3 (1): 113–21. February 1976. doi:10.1111/j.1365-2125.1976.tb00578.x. PMID 788737.
↑ ^2.0 ^2.1 ^2.2 "An evaluation of the anorectic activity in man of a sustained release formulation of tiflorex". British Journal of Clinical Pharmacology 7 (4): 353–6. April 1979. doi:10.1111/j.1365-2125.1979.tb00945.x. PMID 444355.
↑ Stuart, Sam (2013-09-11). Abstracts: Sixth International Congress of Pharmacology. ISBN 9781483152530. https://books.google.com/books?id=z_8kBQAAQBAJ&pg=PA356.
↑ Don P. R. L. Giudicelli & Henry Najer, U.S. Patent 4,148,923 (1979 to Synthelabo SA).

Antiobesity agents/Anorectics (A08)

Central

Stimulants	4-Methylamphetamine^‡ Amfecloral Amfepentorex Amfepramone Aminorex^‡ Amphetamine Amphetaminil Atomoxetine Benfluorex^‡ Benzphetamine Bupropion (+naltrexone; +zonisamide^†) Cathine Cathinone Chlorphentermine Ciclazindol Clobenzorex Cloforex Clominorex Clortermine Dexfenfluramine^‡ Dextroamphetamine Dexmethylphenidate Difemetorex^‡ Dimethylcathinone Ephedrine Ephedra^‡ Etilamfetamine Etolorex Fenbutrazate Fencamfamin Fenethylline Fenfluramine^‡ (+phentermine^‡) Fenproporex Fludorex Fluminorex Furfenorex^‡ Indanorex Khat Levopropylhexedrine Lisdexamfetamine Manifaxine Mazindol Mefenorex Methamphetamine Methylphenidate Norfenfluramine Pemoline Pentorex Phendimetrazine Phenethylamine Phenmetrazine Phentermine (+topiramate) Phenylpropanolamine Picilorex Pipradrol Prolintane Propylhexedrine Pseudoephedrine Pyrovalerone Radafaxine Reboxetine Setazindol Sibutramine^‡ Synephrine Tesofensine Viloxazine Xylopropamine Zylofuramine
Cannabinoid receptor antagonists	Drinabant^§ Ibipinabant^§ Otenabant^§ Rimonabant^‡ Rosonabant^§ Surinabant^§ Taranabant^§
Others	5-HTP Beloranib^§ Galactomannan Guar gum Glucomannan L-DOPA L-Phenylalanine L-Tryptophan L-Tyrosine Lorcaserin Lu AA-33810 Metformin Naltrexone Naloxone Oxyntomodulin P57 Peptide YY Topiramate Velneperit^§ Yohimbine (Yohimbe) Zonisamide Water

Peripheral

^#WHO-EM
^‡Withdrawn from market
Clinical trials:
- ^†Phase III
- ^§Never to phase III

v t e Phenethylamines
Phenethylamines	Psychedelics: 25B-NBOMe 25C-NBOMe 25D-NBOMe 25I-NBOMe 25N-NBOMe 2C-B 2C-B-AN 2C-Bn 2C-Bu 2C-C 2C-CN 2C-CP 2C-D 2C-E 2C-EF 2C-F 2C-G 2C-G-1 2C-G-2 2C-G-3 2C-G-4 2C-G-5 2C-G-6 2C-G-N 2C-H 2C-I 2C-iP 2C-N 2C-NH2 2C-O 2C-O-4 2C-P 2C-Ph 2C-SE 2C-T 2C-T-2 2C-T-3 2C-T-4 2C-T-5 2C-T-6 2C-T-7 2C-T-8 2C-T-9 2C-T-10 2C-T-11 2C-T-12 2C-T-13 2C-T-14 2C-T-15 2C-T-16 2C-T-17 2C-T-18 2C-T-19 2C-T-20 2C-T-21 2C-T-22 2C-T-22.5 2C-T-23 2C-T-24 2C-T-25 2C-T-27 2C-T-28 2C-T-30 2C-T-31 2C-T-32 2C-T-33 2C-TFE 2C-TFM 2C-YN 2C-V Allylescaline DESOXY Escaline Isoproscaline Jimscaline Macromerine MEPEA Mescaline Metaescaline Methallylescaline Proscaline Psi-2C-T-4 TCB-2 Stimulants: Phenylethanolamine Hordenine Phenethylamine α-Methylphenethylamine (amphetamine) β-Methylphenethylamine m-Methylphenethylamine N-Methylphenethylamine o-Methylphenethylamine p-Methylphenethylamine Methylphenidate Entactogens: Lophophine MDPEA MDMPEA Others: BOH DMPEA
Amphetamines	Psychedelics: 3C-BZ 3C-E 3C-P Aleph Beatrice Bromo-DragonFLY D-Deprenyl DMA DMCPA DMMDA DOB DOC DOEF DOET DOI DOM DON DOPR DOTFM Ganesha MMDA MMDA-2 Psi-DOM TMA TeMA Stimulants: 2-FA 2-FMA 3-FA 3-FMA Acridorex Alfetamine Amfecloral Amfepentorex Amphetamine (Dextroamphetamine, Levoamphetamine) Amphetaminil Benfluorex Benzphetamine Cathine Clobenzorex Dimethylamphetamine Ephedrine Etilamfetamine Fencamfamin Fencamine Fenethylline Fenfluramine (Dexfenfluramine, Levofenfluramine) Fenproporex Flucetorex Fludorex Formetorex Furfenorex Gepefrine 4-Hydroxyamphetamine Iofetamine Isopropylamphetamine Lefetamine Lisdexamfetamine Mefenorex Metaraminol Methamphetamine (Dextromethamphetamine, Levomethamphetamine) Methoxyphenamine MMA Morforex Norfenfluramine L -Norpseudoephedrine N,alpha-Diethylphenylethylamine Oxifentorex Oxilofrine Ortetamine PBA PCA Phenpromethamine PFA PFMA PIA PMA PMEA PMMA Phenylpropanolamine Pholedrine Prenylamine Propylamphetamine Pseudoephedrine Sibutramine Tiflorex Tranylcypromine Xylopropamine Zylofuramine Entactogens: 4-FA 4-FMA 4-MA 4-MMA 4-MTA 5-APB 5-APDB 5-EAPB 5-IT 5-MAPB 5-MAPDB 6-APB 6-APDB 6-Chloro-MDMA 6-EAPB 6-IT 6-MAPB 6-MAPDB EDA IAP 2,3-MDA 3,4-MDA (tenamfetamine) MDEA MDHMA MDMA (midomafetamine) MDOH Methamnetamine MMDMA Naphthylaminopropane TAP Others: 3,4-DCA Amiflamine DiFMDA Selegiline (also D -Deprenyl)
Phentermines	Stimulants: Chlorphentermine Cloforex Clortermine Etolorex Mephentermine Pentorex Phentermine Entactogens: MDPH MDMPH Others: Cericlamine
Cathinones	Stimulants: 3-FMC 4-MC 4-BMC 4-CMC 4-EMC 4-FMC 4-MEC 4-MeMABP 4-MPD Amfepramone Benzedrone Brephedrone Buphedrone Bupropion Cathinone Dimethylcathinone Ethcathinone Eutylone Hydroxybupropion Methcathinone Methedrone NEB N-Ethylhexedrone N-Ethylpentedrone Pentedrone Pentylone Radafaxine Entactogens: 3,4-DMMC 3-MMC Butylone Ethylone Methylone Methylenedioxycathinone Mephedrone
Phenylisobutylamines	Entactogens: 4-CAB 4-MAB Ariadne BDB Butylone EBDB Eutylone MBDB Stimulants: Phenylisobutylamine
Phenylalkylpyrrolidines	Stimulants: α-PBP α-PHP α-PPP α-PVP MDPBP MDPPP MDPV 4-MePBP 4-MePHP 4-MePPP MOPPP MOPVP MPBP MPHP MPPP Naphyrone PEP Prolintane Pyrovalerone
Catecholamines (and close relatives)	6-FNE 6-OHDA a-Me-DA a-Me-TRA Adrenochrome Ciladopa D -DOPA (Dextrodopa) Dimetofrine Dopamine Epinephrine Epinine Etilefrine Ethylnorepinephrine Fenclonine Ibopamine Isoprenaline Isoetarine L -DOPA (Levodopa) L -DOPS (Droxidopa) L -Phenylalanine L -Tyrosine m-Tyramine Metanephrine Metaraminol Metaterol Metirosine Methyldopa N,N-Dimethyldopamine Nordefrin (Levonordefrin) Norepinephrine Norfenefrine (m-Octopamine) Normetanephrine Orciprenaline p-Octopamine p-Tyramine Phenylephrine Synephrine
Miscellaneous	AL-LAD Amidephrine Arbutamine Cafedrine Denopamine Desvenlafaxine Diphenidine Dizocilpine Dobutamine Dopexamine Ephenidine Etafedrine ETH-LAD Famprofazone Fluorolintane Hexapradol IP-LAD Lysergic acid amide Lysergic acid 2-butyl amide Lysergic acid 2,4-dimethylazetidide Lysergic acid diethylamide Methoxamine Methoxphenidine MT-45 PARGY-LAD Phenibut PRO-LAD Pronethalol Salbutamol (Levosalbutamol) Solriamfetol Theodrenaline Thiamphenicol UWA-101

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