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C15H20N2O2, 274,364 g/mol – det er 4-Pro-MET på kemiens sprog. Systematisk hedder det 4-propionyloxy-N-methyl-N-ethyltryptamin (IUPAC: [3-[2-[ethyl(methyl)amino]ethyl]-1H-indol-4-yl] propanoat). Lyder tungt. Men er logisk opbygget, når man forstår molekylets tre byggeklodser. Her lærer du, hvordan indolringen fungerer, hvorfor propionyloxy-gruppen tjener som transportemballage, og hvad der adskiller 4-Pro-MET fra beslægtede tryptaminer. Ingen forkundskaber i organisk kemi nødvendige.
Indholdsfortegnelse
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Tryptamins kernestruktur
Serotonin, melatonin, psilocybin, 4-Pro-MET, 4-AcO-DMT – de deler alle samme grundplan: en indolring med ethylamin-sidekæde. Indolringen? En benzenring (seks atomer), smeltet sammen med en pyrrolring (fem atomer). I position 3 på pyrrolringen hænger ethylamin-sidekæden – to carbonatomer med et kvælstof i enden. At serotonin (5-hydroxytryptamin, 5-HT) selv er et tryptamin, viser, hvor dybt dette skelet er forankret i neurokemien.
SMILES-notationen for 4-Pro-MET: CCC(=O)OC1=CC=CC2=C1C(=CN2)CCN(C)CC – en kompakt tegnstreng, der koder hele 3D-strukturen. PubChem-CID: 169222171. Bemærkelsesværdigt: Frem til april 2026 var 4-Pro-MET ikke tildelt noget CAS-nummer. For et stof, der ønsker at eksistere i det kemiske katalog, er det usædvanligt. Psilocybin modtog sit CAS-nummer (520-52-5) i 1960'erne, da Albert Hofmann første gang isolerede og syntetiserede stoffet.
De tre byggeklodser i 4-Pro-MET
Tre dele, tre funktioner:
- Indolringen – det aromatiske rygrad. Denne bicykliske ring passer ind i 5-HT2A-receptorens bindingslomme som en nøgle i en lås. Uden den: ingen receptorbinding, intet serotonergt psykedelikum.
- Ethylamin-sidekæden med N-methyl-N-ethyl-substitution – fingeraftrykket. På det terminale kvælstof: en methylrest (CH3) og en ethylrest (C2H5). Denne asymmetri adskiller 4-Pro-MET fra psilocin/psilocybin (N,N-dimethyl) og påvirker receptorselektivitet og virkningsprofil.
- Propionyloxy-gruppen i position 4 – transportemballagen. En propionsyreester (-O-CO-CH₂-CH₃) på indolringen. I kroppen spalter esteraser denne gruppe, frigiver en hydroxylgruppe (-OH) – og 4-HO-MET, den aktive metabolit, dannes.
To justeringsskruer, stor effekt. 4-substituerede tryptaminer varierer i præcis to positioner: den funktionelle gruppe i position 4 af indolringen og N-substitutionen på sidekæden. Lyder som finjustering – ændrer men stabilitet, farmakokinetik og virkningsprofil mærkbart.
Position 4 i oversigt: Hydroxyl (-OH) ved 4-HO-derivater, acetyloxy (-O-CO-CH3) ved 4-AcO-derivater, propionyloxy (-O-CO-CH₂-CH₃) ved 4-PrO-derivater, phosphoryloxy (-O-PO4H2) ved psilocybin. Alle estervarianterne (AcO, PrO) og phosphatesteren (psilocybin) er prodrugs – kroppen metaboliserer dem til 4-HO-derivatet. Afgørende er hydrolyseratten: Kortere estere (acetyl) spaltes hurtigere end længere (propionyl), hvilket påvirker onset.
N-positionen: N,N-dimethyl (DMT-type, symmetrisk), N-methyl-N-ethyl (MET-type, asymmetrisk), N,N-diethyl (DET-type, symmetrisk). Hos 4-Pro-MET skaber den asymmetriske N-Me/N-Et-substitution et kiralt center ved kvælstoffet – teoretisk to enantiomerer. Og hvordan mærkes forskellen? Community-rapporter beskriver MET-typen som visuelt mere intens med klarere headspace sammenlignet med DMT-typen. Kontrollerede sammenligningsstudier mangler dog. Shulgin noterede i TiHKAL for 4-HO-MET en kvalitet, der var 'a lot like psilocin' – men med bølgeagtige effekter.
At position 4 of the indole ring, 4-Pro-MET carries a propionyloxy group (-O-CO-CH2-CH3) – a three-carbon acyl ester, propanoic acid linked through an oxygen to the ring. This position matters because it corresponds to the 4-hydroxy position in the active metabolite 4-HO-MET and in natural compounds like psilocin.
Think of the propionyloxy group as a molecular cap. It shields the vulnerable 4-position from oxidation and doubles as the prodrug switch: when esterase enzymes cleave the ester bond, off comes the cap, and the active 4-hydroxy compound is exposed. The IUPAC name spells this out: [3-[2-[ethyl(methyl)amino]ethyl]-1H-indol-4-yl] propanoate – literally the propanoate ester of an indole bearing an ethyl-methyl-aminoethyl side chain.
Flertrinsprocedure, beskrevet for beslægtede 4-acyloxytryptaminer i den videnskabelige litteratur. Alexander Shulgin dokumenterede i TiHKAL (1997) en tostegssyntese af 4-HO-MET med udgangspunkt i 4-acetoxyindol: først reaktion med oxalylchlorid, derefter reaktion med methylethylamin, afsluttende LiAlH4-reduktion. For propionyloxy-varianten (4-Pro-MET) ville der være brug for et yderligere eller alternativt foresteringstrin.
Prodrug-designet: Beskyttelsesgruppestrategi
Propionyloxy-gruppen er ikke pynt. Den løser et håndgribeligt problem: 4-Hydroxytryptaminer som 4-HO-MET oxiderer i luft. Hydroxylgruppen i position 4 reagerer, stoffet misfarver sig mørkt, nedbrydes. Gennem foresterring med propionsyre beskyttes den reaktive OH-gruppe. Esterbindingen holder under opbevaringsforhold, men spaltes mühelos i kroppen af esteraser. Beskyttelse udenfor, aktivering indenfor – det er prodrug-design i koncentreret form.
Ingen nichekonception i øvrigt: Ca. 10% af alle godkendte lægemidler er prodrugs (Rautio et al., 2008, Nature Reviews Drug Discovery). Aspirin er et prodrug af salicylsyre. Codein af morfin. Psilocybin af psilocin. 4-Pro-MET følger den samme logik – med en forskel: Propionyloxy-strategien stammer fra forskningsmiljøet, ikke fra farmaceutisk udvikling. Klinisk optimeret er den ikke.
Fumarat-saltform: Yderligere stabilisering
På forskningsmarkedet får du 4-Pro-MET normalt som fumaratsalt. Saltdannelse med fumarsyre øger stabilitet og vandopløselighed – begge relevante for opbevaring og håndtering. Men pas på: Fumaratsal·tet vejer mere end den frie base. En del af massen tilhører fumarsyren, den effektive dosis af det aktive molekyl er tilsvarende lavere. Doseringsangivelser bør derfor altid præcisere, om de refererer til den frie base eller saltformen.
On 4-Pro-MET's ethylamine side chain, the terminal nitrogen carries two different alkyl groups: one methyl (-CH3) and one ethyl (-C2H5). This asymmetric pattern defines the "MET" series (M=methyl, ET=ethyl) and sets it apart from the "DMT" series (N,N-dimethyl). The asymmetry creates a chiral environment around the nitrogen – and that likely influences how the molecule orients itself inside receptor binding pockets.
Community researchers consistently describe MET-series compounds as producing a "clearer headspace" with more prominent visuals compared to their DMT-series counterparts. The exact pharmacological basis isn't fully worked out yet, but the asymmetric N-substitution is thought to alter binding dynamics at 5-HT2A and other serotonin receptors, potentially affecting signaling bias and receptor residence time.
Synteseoversigt (konceptuel)
4-Pro-MET follows established routes common to 4-acyloxy tryptamines. Two conceptual pathways: (a) direct esterification of 4-HO-MET with propionic anhydride or propionyl chloride, or (b) building the tryptamine from 4-acetoxyindole precursors through oxalyl chloride coupling, amine addition, and lithium aluminum hydride reduction (the Speeter-Anthony pathway Shulgin described for related compounds), then performing an ester exchange.
Shulgin documented 4-HO-MET synthesis in TiHKAL (entry #21) as a two-step process from 4-acetoxyindole. 4-Pro-MET itself never appeared in TiHKAL – it first surfaced as a research chemical in 2025. For commercial distribution, it's typically converted to its fumarate salt, which offers better stability and crystalline properties.
Note: This section provides conceptual understanding only. Detailed synthesis instructions are intentionally omitted.
Juridisk meddelelse
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FAQ: 4-Pro-MET Chemical Structure & Synthesis: A Beginner's Guide
C16H22N2O2 with a molecular weight of 274.364 g/mol. The PubChem CID is 169222171. It consists of an indole ring, propionyloxy ester at position 4, and N-methyl-N-ethyl substituents on the side chain nitrogen.
The only difference is the ester group at position 4: 4-Pro-MET has propionyloxy (3-carbon acyl chain: -O-CO-CH2-CH3) while 4-AcO-MET has acetyloxy (2-carbon: -O-CO-CH3). This single additional methylene group affects hydrolysis rate, stability, and potentially onset timing.
MET indicates N-Methyl-N-Ethyl-Tryptamine – the pattern of nitrogen substitution on the ethylamine side chain. One methyl group (M) and one ethyl group (ET). This distinguishes it from DMT series compounds which have N,N-di-methyl substitution.
No. 4-Pro-MET is entirely synthetic. While related 4-hydroxy tryptamines occur naturally (psilocin in mushrooms, bufotenine in toad secretions), no 4-propionyloxy tryptamines have been found in nature. The compound was first reported as a research chemical in August/September 2025.
Position 4 is the key pharmacological modification site for psychedelic tryptamines. A hydroxyl group here (as in psilocin, 4-HO-MET) is required for strong 5-HT2A receptor agonism. Ester groups at this position (propionyloxy, acetyloxy, phosphoryloxy) serve as prodrug caps that protect the hydroxyl and are cleaved in the body to release the active compound.
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