While farting around at http://gb.espacenet.com/, I found a patent that I think is interesting:
Lower alkyl 4-phenyl-1-(hydrocarbyl) piperidine-4-carboxylates and the preparation thereof
Love my country, fear my government.
|Those precious little analogs||Bookmark|
Interesting, hmm ..., it most definitely is.
This ethyl 4-phenyl-1-(3-phenylpropyl)-piperidine-4
The only problem with this patent would be the synthesis of the ethyl 4-phenylpiperidine-4-carboxylate hydrochloride precursor. This is not like a easy thing to do .
For mor information about pethidine & analogs see: http://www.undcp.org/bulletin/bulletin_1