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| Other names | Preclamol |
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| Formula | C14H21NO |
| Molar mass | 219.328 g·mol−1 |
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3-PPP (N-n-propyl-3-(3-hydroxyphenyl)piperidine) is a mixedsigmaσ1 andσ2 receptoragonist (with similaraffinity for both subtypes, though slightly higher affinity for the latter)[1] andD2 receptorpartial agonist which is used inscientific research.[2][3] It showsstereoselectivity in itspharmacodynamics.[2] (+)-3-PPP is theenantiomer that acts as an agonist of the sigma receptors;[3] it is also an agonist of both D2presynaptic andpostsynaptic receptors.[2] Conversely, (−)-3-PPP, also known aspreclamol (INNTooltip International Nonproprietary Name), acts as an agonist of presynaptic D2 receptors but as an antagonist of postsynaptic D2 receptors, and hasantipsychotic effects.[2][4] 3-PPP has also been reported to be amonoamine reuptake inhibitor and possibly to act atadrenergic receptors or some other non-sigma receptor.[5]
The Grignard reagent was prepared for 3-Bromoanisole [2398-37-0] (1) and this was reacted with 3-Bromopyridine [626-55-1] (2) to give 3-(3-methoxyphenyl)pyridine [4373-67-5] (3). Reaction with 1-bromopropane [106-94-5] occurred to give the quaternary salt PC13695099 (4a). {Alternatively catalytic hydrogenation of 3 could be attempted directly to give 3-(3-methoxyphenyl)piperidine [79601-21-1] (4b). A second reductive amination with propionic acid was then performed.} Catalytic hydrogenation of the quat cation gave 3-(3-methoxyphenyl)-1-propylpiperidine [86562-23-4] (5). Demethylation with hydrogen bromide then completed the synthesis of preclamol (6).
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