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  • Title: Morphine-like activity of substituted amides & imides of [D-Ala2, Met5]-enkephalin.
    Author: Raghubir R, Patnaik GK, Sharma SD, Dhotre BJ, Mathur KB, Dhawan BN.
    Journal: Indian J Med Res; 1989 Apr; 90():107-12. PubMed ID: 2759667.
    Abstract:
    Six enkephalin analogues (N-substituted amides and imides of [D-Ala2, Met5]-enkephalin) were synthesized and tested for opioid activity. All the compounds, except one i.e., compound IV, showed analgesic activity which was much higher than Met-enkephalin and morphine in mice and inhibited electrically induced contractions of isolated guineapig ileum, [D-Ala2, Met5]-enkephalin-morpholide and [D-Ala2, Met5]-enkephalin-beta-Ala-amide were the most potent analgesics and nearly 6 and 500 times as active as morphine and Met-enkephalin respectively. Both the compounds were equipotent on the guineapig ileum preparation, whereas the beta-Ala-amide was about twice as active as the morpholide in the electrically stimulated mouse vas deferens preparation.
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