Synthesis and analgesic properties of N-substituted trans-4a-aryldecahydroisoquinolines.

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Zimmerman DM, Cantrell BE, Swartzendruber JK, Jones ND, Mendelsohn LG, Leander JD, Nickander RC

Synthesis and analgesic properties of N-substituted trans-4a-aryldecahydroisoquinolines.

J Med Chem. 1988 Mar;31(3):555-60.

PubMed ID

2831363 [ View in PubMed

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Abstract

A representative series of N-substituted derivatives of the morphine-based trans-4a-aryldecahydroisoquinoline were synthesized and evaluated for opioid analgesic activities. Compounds with potent analgesic activity and high affinities for the mu and kappa opioid receptors were discovered. The effect of varying the N-substituent in the trans-4a-aryldecahydroisoquinoline paralleled, to a certain extent, previous findings with other morphine part structures. Replacement of the N-methyl with a phenethyl group significantly increased analgesic potency. The N-cyclopropylmethyl analogue was found in rodents to have mixed agonist-antagonist properties; however, its antagonist activity was far weaker than those reported for the N-(cyclopropylmethyl)morphinan and -benzomorphan derivatives. Resolution of the stereoisomers and determination of their absolute configuration by X-ray crystallography showed that the opioid receptor effects were predominantly found with the 4aR,8aR isomer, the same relative absolute configuration of morphine. Unexpectedly, the 4aR,8aR N-cyclopropylmethyl analogue (compound 30), which in rodents had mixed agonist-antagonist properties similar to those of pentazocine, was found in rhesus monkeys to behave as a full morphine-like agonist.

DrugBank Data that Cites this Article

Binding Properties

Drug	Target	Property	Measurement	pH	Temperature (°C)
Morphine	Kappa-type opioid receptor	Ki (nM)	167	N/A	N/A	Details