Methylnaphthidate

Methylnaphthidate

HDMP-28 or methylnaphthidate is a piperidine based stimulant drug, closely related to methylphenidate, but with the phenyl ring replaced by naphthalene. It is a potent dopamine reuptake inhibitor, with several times the potency of methylphenidate and a short duration of action,[1] and is a structural isomer of another potent dopamine reuptake inhibitor, N,O-Dimethyl-4-(2-naphthyl)piperidine-3-carboxylate.

Most of the TMP analogs of HDMP-28 have SERT Ki values in the range >10,000 and so are selective for dopamine and noradrenaline reuptake, with little or no effect on serotonin. HDMP-28 also has high affinity to SERT, and so behaves as a triple reuptake inhibitor.[2]

aEffect of (dl-threo) TMP and analogs on DA and 5HT Transporters.
Ar [3H]CFT DAT [3H]DA Uptake [3H]RTI-55 SERT Inhibition by 10μM D.R. Potency
Ph 83.9 224 >>10,000 19.6 2.7 1.00
p-F 35.0 142 >10,000 36.9 4.1 3.33
m-Cl 5.1 23.0 >10,000 45.5 4.5 2.42
p-Me 33.0 126 >10,000 45.0 3.8 0.74
p-NH2 34.5 114 >>10,000 7.9 3.3 2.18
m,p-Cl2 5.3 (2.67)b 7.0 1,064 (>10,000)b 93.3 1.3 7.98
β-Naphthyl 33.9b 11.0c 53.0c 71.6b nd 4.8c
Cocaine 160 404 401 nd 2.5 0.41
aSchweri, et al. (2002);[3] bDavies, et al. (2004);[4] cDeutsch, et al. (2001).[5]

D.R. = Discrimination Ratio = [3H]DA ÷ [3H]CFT.

A low D.R. = addictive, whereas a high D.R. = low propensity for self-administration.

See also

References