• Neuroscience & Pharmacology Discussion Welcome Guest
    Posting Rules Bluelight Rules
    Recent Journal Articles Chemistry Mega-Thread
    FREE Chemistry Databases! Self-Education Guide

  • N&PD Moderators: Skorpio | someguyontheinternet

Possible CNS activity of a major methoxetamine synthesis impurity?

I do apologise, I mistakenly though we were talking about this molecule:

VEBQa.png
 
That's why I was suggesting reduced CNS activity, I didn't look at the OP's molecule closely enough, sorry! I will do a literature search for ketamine with a 5 membered ring actually.
 
A significant amount of a by-product (impurity) was
produced during the synthesis of methoxetamine.
Click to expand...

The article never states that they actually found this particular impurity in MXE in the field. It just says that during the DEA's synthesis, they accidentally made this byproduct. We don't know if the "UK" suppliers or the Chinese manufacturers use the DEA's synthesis protocol or totally different ones. Until someone finds this impurity in commercial MXE, all we can do is speculate.
 
Last edited:
Ceres said:
Can't find anything in the literature having that cyclopentane ring, interesting.
Click to expand...

Perhaps not a close ketamine analogue, but if I'm not mistaken, the PCP analogue with a cyclopentane in place of cyclohexane is actually a scheduled drug in the US.
 
both as the hcl salt are likely to have the same solubility in any given solvent, 'washing' unidentified white powders in acetone that hasn't been dried over silica or MgSO4 etc isn't really helpful for anything, like I said it would be much more informative to TLC samples from several differing batches of 'mxe' together on a single plate.

edit> then if there was distinct seperation of more than one spot with any particular sample, the same material could then be seperated on a silica column, recrystallised and sent for NMR / MS to identify for sure what it was, that is if anyone cared enough to go to the effort...
 
Last edited:
^Well as someone quoted earlier in the thread, the DEA study found that the two can be separated with an acetone wash. And I wasn't asking so I could measure the purity, I was asking so I could purify a sample.
 
Small (milligram) amounts could be seperated with inexpensive TLC plates (cutting out seperated spots), larger amounts with preparative TLC plates, even larger amounts with straightforward flash chromatography using a silica column.

With any unidentified white powder, you can't really make presumptions about what it might contain, e.g wether it contains methoxetamine hcl and the impurity mentioned, multiple organic reaction impurities, diluents, adulterants and so on, without doing some sort of rudimentary analysis first.

It's difficult to generalise about any particular sample one might come across, that particular impurity could be solely confined to one particular batch produced by any number of labs, and once the sample in question gets into ones hands it could have been through any number of intermediaries that could have added adulterants or diluents or stored the material in a way that caused decomposition products to appear and so on...
 
Last edited:
As everyone said, someone with a bunch of methoxetamine should just run some TLCs. TLC plates aren't controlled and can be ordered from a ton of places. I'd guess you can run it in 50:50:1 xylene : acetone : glacial acetic acid with good resolution on a full sized plate so long as you spot the free bases.

edit: Well, I guess the obvious problem is that even if you spot the free base it'll be quickly protonated by the GAA, which you may have to skip on.
 
Last edited:
I seem to remember doing a test seperation on a 10x5cm UV254nm plate using either an MeOH/IPA/Acetone mixture or one of those on their own, with a couple of drops of household ammonia added, spotting the methoxetamine hcl sample onto the plate after having dissolved it in methanol. I'm pretty sure it either migrated too far up the plate or not far enough to be called an ideal solvent system though, I didn't follow it up and don't have the notes anymore unfortunately.

edit> I think the mix was too polar and I was gonna rerun it with some toluene added.
 
Last edited:
This paper describes a closely related compound to the one the OP mentions:

Tice, Colin M.; Hormann, Robert E.; Thompson, Christine S.; Friz, Jennifer L.; Cavanaugh, Caitlin K.; Michelotti, Enrique L.; Garcia, Javier; Nicolas, Ernesto; Albericio, Fernando
Bioorganic & Medicinal Chemistry Letters, 2003 , vol. 13, # 3 p. 475 - 478

Synthesis and SAR of α-Acylaminoketone Ligands for Control of Gene Expression
A lead discovery library and a follow-up focused library of α-acylaminoketones were designed based on known dibenzoylhydrazine ecdysone agonists, including GSTM-E. The compounds were assayed in mammalian cells expressing the ecdysone receptor from Bombyx mori for their ability to cause expression of a reporter gene downstream of an ecdysone response element. The most potent α-acylaminoketones were comparable to GSTM-E in this assay.
 
doppelgänger said:
Can anybody gess from the spectra how big the percentage of this is in their methoxetamine?
I'm wondering if this might be responsible for the mania some users report with mxe.
Click to expand...

mania is reported with almost every arylocyclohexamines, some more, some less and methoxetamine has a pretty wide spectrum of effects from person to person and seems overall pretty unpredictable in that matter. id rather blame the mania part on the strange nature of this compound than on impurities. i experienced problems with building up mania and i think that means that mxe just isnt the right choice for everyones brain chemisty.
 
It's impossible to say what might be in your methoxetamine, after reading that DEA paper it doesn't imply that this impurity is going to present in every synth. Off-white colour could just mean the reaction hasn't been worked up properly and purified completely on a column. Guessing just isn't viable.
 
The yellow, off-white MXE is well known to be impure compared to the more white fluffy batch (from china) and the second batch, also white (with chunks in it) which is, as it seems, from another lab in india.
 
tryp2fun said:
This looks like a simple acid-catalyzed rearrangement of methoxetamine. It probably happens if it is heated too much while forming an acid salt. The possible mechanism is shown below.
Click to expand...
Do you think there is also a possibility that the product gets formed at an earlier stage, when the bromide is converted to the N-methylimine. (so alkylation at this step instead)
 
planckunit said:
Do you think there is also a possibility that the product gets formed at an earlier stage, when the bromide is converted to the N-methylimine. (so alkylation at this step instead)
Click to expand...

Yep, that's a side reaction I'd expect to occur during imine formation. I guess chromatography is needed to seperate that from methoxetamine (or from the N-ethylimine-cyclopentanol, if they clean up before the heating step) and I'm not sure all manufacturers would go through that hassle.
I don't really see why substantial amounts of this compound should be formed during neutralization of methoxetamine base, as the amine is way more basic than carbonyl-oxygen.
 
mllx said:
Here's the mass spectrum of a very common impurity in MXE (second graphic), is it 1-(ethylamino)cyclopentyl](3-methoxyphenyl)methanone?

http://www.sendspace.com/file/bd762b
Click to expand...

No, that doesn't appear to be 1-(ethylamino)cyclopentyl](3-methoxyphenyl)methanone. That is somewhat interesting though, but with only the GC/MS it is impossible to tell what we are looking at. I'm curious how this impurity was isolated from methoxetamine and if you have any other spectra available.
 
You must log in or register to reply here.
Top