Hello my friend, how are you?
This is the only pathway to 4-MTA that i know of!!
Upgrade?..How do you mean? ;D
4-methylthiobenzaldehyde + nitroethane + n-butylamine-->1-(4-methylthiophenyl)–2-nitropropene
1-(4-methylthiophenyl)–2-nitropropene + LAH-->4-methylthioamphetamine HCl?
This is from my archives
Although 4-methylthioamphetamine is a known compound that has been synthesized previously and used particularly for pharmacological studies on animals, it appears that
this compound is now appearing in illicit tablets.
It has been reported in the United Kingdom, the Netherlands, Germany, Switzerland and even in Australia and it would not be surprising if this compound was found in other countries.
The purpose of selling this substance on the street market is not known as the effects on humans are not yet defined to the knowledge of the authors.
Currently, identification of this new compound may be hampered due to the lack of available standards or reference data or both. Therefore, it is hoped that the data reported here will help to overcome this problem.
As far as is known, 4-methylthioamphetamine is not currently treated as a controlled drug by legislation and 4-methylthiobenzaldehyde (which is the more obvious precursor) is commercially available.
Further studies on the toxicity and pharmacological effects on humans are necessary as the abuse and spreading of this compound seem to be increasing.