Tropoxane

Tropoxane (O-1072)[1] is an aryloxytropane derivative drug developed by Organix Inc.,[2] which acts as a stimulant and potent dopamine and serotonin reuptake inhibitor. It is an analogue of dichloropane where the amine nitrogen has been replaced by an oxygen ether link (at the bridgehead position), demonstrating that the amine nitrogen is not required for DAT binding and reuptake inhibition.[3][4][5]

Tropoxane
Clinical data
ATC code
  • none
Identifiers
PubChem CID
ChemSpider
Chemical and physical data
FormulaC15H16Cl2O3
Molar mass315.192 g/mol g·mol−1
3D model (JSmol)
  (verify)

Thia analog

The 8-thiabicyclo(3.2.1)octanes analogs such as O-4210 have been prepared.[6] A representative set of analogs is listed below.

MAT IC50 (nM) 8-thiabicyclo[3.2.1]octanes
XComDATSERTComDATSERTComDATSERT
H1a910>10uM2a140>8uM3a117>3uM
F1b220>30uM2b59>11uM3b38494
Cl1c13>10uM2c111uM3c9.633
Br1d9.1>25uM2d6.03423d6.014
I1e6.7>8uM2e9.0703e1410
Cl21f4.5>3uM2f6.9993f5.78.0
BN1g8.0>1uM2g8.0363g1613

It had been hypothesized that transporter binding of the tropanes might include ionic bonding of the central tropane nitrogen. But it turned out that at this site neither ionic nor hydrogen bonding is a prerequisite for potent monoamine reuptake inhibition. Oxa- and thia-analogs of RTI-111 are potent inhibitors, and even an N-replacement by methylene holds the potency within the same magnitude.[6][7][8] However, N-quaternisation (N-dimethyl) considerably reduces DAT affinity.

In this SAR, the focus is on seeing the effect of changing 8-NMe to S, O, or CH2. Both enantiomers, as well as the racemates are presented in several cases for comparison.

MAT IC50 (nM) Cl2 bicyclo[3.2.1]octanes
Enant.XComDATSERTComDATSERTComDATSERT
RacS1a4.53,6002a6.9993a5.78.0
RacO1a106,0002a3.164.53a3.36.5
1RNMe1a1.28672a0.4273a1.12.5
RacCH21a7.15,1602a131663a9.633

See also

References
  1. Meltzer PC, Blundell P, Chen Z, Yong YF, Madras BK. Bicyclo[3.2.1]octanes: synthesis and inhibition of binding at the dopamine and serotonin transporters. Bioorg Med Chem Lett. 1999 Mar 22;9(6):857-62. PMID 10206550
  2. WO application 9740859, Madras BK, Meltzer PC, "Bridge-substituted Tropanes and Uses", published 6 November 1997, assigned to Harvard College
  3. Madras BK, Pristupa ZB, Niznik HB, Liang AY, Blundell P, Gonzalez MD, Meltzer PC (December 1996). "Nitrogen-based drugs are not essential for blockade of monoamine transporters". Synapse. 24 (4): 340–8. doi:10.1002/(SICI)1098-2396(199612)24:4<340::AID-SYN4>3.0.CO;2-D. PMID 10638825.
  4. Meltzer PC, Liang AY, Blundell P, Gonzalez MD, Chen Z, George C, Madras BK (August 1997). "2-Carbomethoxy-3-aryl-8-oxabicyclo[3.2.1]octanes: potent non-nitrogen inhibitors of monoamine transporters". Journal of Medicinal Chemistry. 40 (17): 2661–73. doi:10.1021/jm9703045. PMID 9276012.
  5. Madras BK, Miller GM, Meltzer PC, Brownell AL, Fischman AJ (July 2000). "Molecular and regional targets of cocaine in primate brain: liberation from prosaic views". Addiction Biology. 5 (3): 351–9. doi:10.1111/j.1369-1600.2000.tb00202.x. PMID 20575852.
  6. Pham-Huu DP, Deschamps JR, Liu S, Madras BK, Meltzer PC (January 2007). "Synthesis of 8-thiabicyclo[3.2.1]octanes and their binding affinity for the dopamine and serotonin transporters". Bioorganic & Medicinal Chemistry. 15 (2): 1067–82. doi:10.1016/j.bmc.2006.10.016. PMC 1829488. PMID 17070057.
  7. Madras BK, Fahey MA, Miller GM, De La Garza R, Goulet M, Spealman RD, Meltzer PC, George SR, O'Dowd BF, Bonab AA, Livni E, Fischman AJ (October 2003). "Non-amine-based dopamine transporter (reuptake) inhibitors retain properties of amine-based progenitors". European Journal of Pharmacology. 479 (1–3): 41–51. doi:10.1016/j.ejphar.2003.08.055. PMID 14612136.
  8. Goulet M, Miller GM, Bendor J, Liu S, Meltzer PC, Madras BK (December 2001). "Non-amines, drugs without an amine nitrogen, potently block serotonin transport: novel antidepressant candidates?". Synapse. New York, N.Y. 42 (3): 129–40. doi:10.1002/syn.1108. PMID 11746710.
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