Analgesic activity and selectivity of isothiocyanate derivatives of fentanyl analogs for opioid receptors
Bi-Yi C, Wen-Qiao J, Jie C, Xin-Jian C,
You-Cheng Z, Zhi-Qiang C
Shanghai Institute of Materia Medica,
Chinese Academy of Sciences
Life Sci 1999; 65(15):1589-95


The analgesic activity and opioid receptor binding characteristics were studied for the isothiocyanate ohmefentanyl (OMFIT), and isothiocyanate carfentanil (CarFIT), isothiocyanate 4-methoxymethylfentanyl (MethoFIT), isothiocyanate 3-methylfentanyl (superFIT) and their amide analogs. Antinociceptive activity was evaluated using the mouse hot plate test; selectivity for opioid receptor was determined in bioassay and binding assay. SuperFIT, CarFIT, OMFIT and MethoFIT exhibited an analgesic ED50 lower than those of their parent compounds without isothiocyanate (SCN) group. Furthermore these compounds exhibited potent inhibitory actions on the electrically evoked contractions of mouse vas deferens, which could be antagonized by naloxone, but their actions were weaker than those of their parent compounds without SC N-group. The inhibitory actions of these compounds on binding of [3H]OMF to mouse brain membrane was weaker than those of their parent compounds without SCN-group. CarFIT and MethoFIT showed weaker inhibitory actions on the binding of [3H] DADLE than their parent compounds without SCN-group, but SuperFIT and OMFIT stronger than their parent compounds, 3-methylfentanyl and ohmefentanyl. The selectivity of these isothiocyanate derivatives for delta opioid receptors increased. In conclusion, introducing isothiocyanato-group into 1-position of phenyl ring of ohmefentanyl and other fentanyl analogs would enhance the selectivity of these compounds for delta-opioid receptors, but decrease their analgesic activity.
Designer drugs
Fentanyl for cats
4-methyl fentanyl
Fentanyl: synthesis
Transdermal fentanyl
Fentanyl and ketamine
Opioids and anaesthesia
Remifentanil and alfentanil
Fentanyl withdrawal and depression
Morphine: a mood-brightening smart-drug?

and further reading

Future Opioids
BLTC Research
Utopian Surgery?
The Abolitionist Project
The Hedonistic Imperative
The Reproductive Revolution
Critique of Huxley's Brave New World

The Good Drug Guide
The Good Drug Guide

The Responsible Parent's Guide
To Healthy Mood Boosters For All The Family