2-Methylphenethylamine

2-Methylphenethylamine
Names
	Preferred IUPAC name 2-(2-Methylphenyl)ethan-1-amine
	Other names 2-(2-Methylphenyl)ethanamine; 2-Methylbenzeneethanamine; 2-(o-Tolyl)ethan-1-amine
Identifiers
CAS Number	55755-16-3 ;
3D model (JSmol)	Interactive image;
ChEMBL	ChEMBL451372 ;
ChemSpider	1554538 ;
ECHA InfoCard	100.199.500
PubChem CID	2063868;
UNII	B2VHM2W3X9 ;
CompTox Dashboard (EPA)	DTXSID60366371 ;
	SMILES CC1=CC=CC=C1CCN;
Properties
Chemical formula	C9H13N
Molar mass	135.210 g·mol−1
Appearance	Clear colorless liquid at room temp
Density	0.96 g/cm3
Boiling point	97 °C (207 °F; 370 K) / 5 mmHg (270.7984 °C / 760 mmHg) Experimental
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Corrosive; causes burns
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

2-Methylphenethylamine (2MPEA) is an organic compound with the chemical formula of C₉H₁₃N. 2MPEA is a human trace amine associated receptor 1 (TAAR1) agonist,^[3] a property which it shares with its monomethylated phenethylamine isomers, such as amphetamine (α-methylphenethylamine), β-methylphenethylamine, and N-methylphenethylamine (a trace amine).^[3]

Very little data, even on toxicity, is available about its effects on humans other than that it activates the human TAAR1 receptor.

^ ^a ^b "2-Methylphenethylamine". National Library of Medicine. Retrieved 24 June 2023.
^ "2-(2-Methylphenyl)ethanamine". Chemspider. Retrieved 27 May 2014.
^ ^a ^b Wainscott DB, Little SP, Yin T, Tu Y, Rocco VP, He JX, Nelson DL (January 2007). "Pharmacologic characterization of the cloned human trace amine-associated receptor1 (TAAR1) and evidence for species differences with the rat TAAR1". The Journal of Pharmacology and Experimental Therapeutics. 320 (1): 475–85. doi:10.1124/jpet.106.112532. PMID 17038507. S2CID 10829497. Several series of substituted phenylethylamines were investigated for activity at the human TAAR1 (Table 2). A surprising finding was the potency of phenylethylamines with substituents at the phenyl C2 position relative to their respective C4-substituted congeners. In each case, except for the hydroxyl substituent, the C2-substituted compound had 8- to 27-fold higher potency than the C4-substituted compound. The C3-substituted compound in each homologous series was typically 2- to 5-fold less potent than the 2-substituted compound, except for the hydroxyl substituent. The most potent of the 2-substituted phenylethylamines was 2-chloro-β-PEA, followed by 2-fluoro-β-PEA, 2-bromo-β-PEA, 2-methoxy-β-PEA, 2-methyl-β-PEA, and then 2-hydroxy-β-PEA.
The effect of β-carbon substitution on the phenylethylamine side chain was also investigated (Table 3). A β-methyl substituent was well tolerated compared with β-PEA. In fact, S-(−)-β-methyl-β-PEA was as potent as β-PEA at human TAAR1. β-Hydroxyl substitution was, however, not tolerated compared with β-PEA. In both cases of β-substitution, enantiomeric selectivity was demonstrated.
In contrast to a methyl substitution on the β-carbon, an α-methyl substitution reduced potency by ~10-fold for d-amphetamine and 16-fold for l-amphetamine relative to β-PEA (Table 4). N-Methyl substitution was fairly well tolerated; however, N,N-dimethyl substitution was not.

[CB-1] "2-Methylphenethylamine". National Library of Medicine. Retrieved 24 June 2023.

[2] "2-(2-Methylphenyl)ethanamine". Chemspider. Retrieved 27 May 2014.

[TAAR1_ligands-3] Wainscott DB, Little SP, Yin T, Tu Y, Rocco VP, He JX, Nelson DL (January 2007). "Pharmacologic characterization of the cloned human trace amine-associated receptor1 (TAAR1) and evidence for species differences with the rat TAAR1". The Journal of Pharmacology and Experimental Therapeutics. 320 (1): 475–85. doi:10.1124/jpet.106.112532. PMID 17038507. S2CID 10829497. Several series of substituted phenylethylamines were investigated for activity at the human TAAR1 (Table 2). A surprising finding was the potency of phenylethylamines with substituents at the phenyl C2 position relative to their respective C4-substituted congeners. In each case, except for the hydroxyl substituent, the C2-substituted compound had 8- to 27-fold higher potency than the C4-substituted compound. The C3-substituted compound in each homologous series was typically 2- to 5-fold less potent than the 2-substituted compound, except for the hydroxyl substituent. The most potent of the 2-substituted phenylethylamines was 2-chloro-β-PEA, followed by 2-fluoro-β-PEA, 2-bromo-β-PEA, 2-methoxy-β-PEA, 2-methyl-β-PEA, and then 2-hydroxy-β-PEA.
The effect of β-carbon substitution on the phenylethylamine side chain was also investigated (Table 3). A β-methyl substituent was well tolerated compared with β-PEA. In fact, S-(−)-β-methyl-β-PEA was as potent as β-PEA at human TAAR1. β-Hydroxyl substitution was, however, not tolerated compared with β-PEA. In both cases of β-substitution, enantiomeric selectivity was demonstrated.
In contrast to a methyl substitution on the β-carbon, an α-methyl substitution reduced potency by ~10-fold for d-amphetamine and 16-fold for l-amphetamine relative to β-PEA (Table 4). N-Methyl substitution was fairly well tolerated; however, N,N-dimethyl substitution was not.

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