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Title: Bromadol  
Author: World Heritage Encyclopedia
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Subject: Tramadol, Opioid, 1,4-Benzoquinone, O-Desmethyltramadol, Equianalgesic
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Bromadol (systematic name 4-(4-bromophenyl)-4-(dimethylamino)-1-(2-phenylethyl)cyclohexanol, BDPC) is a potent narcotic analgesic with a distinctive chemical structure. It was developed by Daniel Lednicer at Upjohn in the 1970s.[1] Initial studies showed that it was around 10,000 times the strength of morphine[2] in animal models although later studies assigned a value of x504 morphine for the trans (the more active) isomer.[3] To date it is unknown if this drug has been used by humans, however, it was seized along with three kilograms of acetylfentanyl in an April 25, 2013 police action in Montreal, Canada. Despite taking precautions, at least two officers became intoxicated due to handling the drugs. [4]

Opioid pharmacology

BDPC has never been used in humans, but would be expected to produce effects similar to those of other potent opioid agonists, including strong analgesia, sedation, euphoria, constipation, itching and respiratory depression which could be harmful or fatal. Tolerance and dependence would be expected to develop rapidly based on the potency of the drug, as it is of a similar strength to sufentanil and so would most likely cause pronounced tachyphylaxis following repeated dosing, as is seen with the potent fentanyl analogues.

Structure-activity relationships

Several related analogues such as the p-methyl and ring-unsubstituted compounds have also been investigated.[5] Bromadol is the lead compound in this series that attracted so much interest in it initially. A large number of analogs have been prepared,[6][7] and the SAR is very well established. Lednicer constructed Dreiding models to show that the model of bromadol will give an exact overlay on a model of fentanyl.


It is made from 1,4-cyclohexadione. Details for this are outlined in Organic Syntheses.[8]

U.S. Patent 4,366,172

See also


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