Yong Z, Hao W, Weifang Y, Qiyuan D, Xinjian C, Wenqiao J, Youcheng Z. Synthesis and analgesic activity of stereoisomers of cis-fluoro-ohmefentanyl.
Pharmazie 2003;
58:300-2. [PMID:
12779044]
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Abstract
Four stereoisomers 1a-d of cis-fluoro-ohmefentanyl have been synthesized. Their absolute configurations were determined by X-ray analysis of (3S,4R,2'S)-(-)-cis-I d. The analgesic activity (mice, sc, hot plate) revealed extreme stereodifferences. The ED50 value of (3R,4S,2'S)-(+)-cis-I (1a) was 0.000774 mg/kg (17958 times more potent than that of morphine), while the corresponding antipode 1c was almost inactive.
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