title: Convenient synthesis of 6-nor-9,10-dihydrolysergic acid methyl ester.
abstract: 6-Nor-9,10-dihydrolysergic acid methyl ester (IV) was prepared by demethylation of 9,10-dihydrolysergic acid methyl ester (II) with 2,2,2-trichloroethyl chloroformate, followed by reduction of the intermediate carbamate (III) with zinc in acetic acid. The 6-ethyl-V and 6-n-propyl-VI derivatives were prepared by alkylation of IV with the appropriate halide. All of the ergoline derivatives were evaluated for stereotyped behavior in rats, with 6-nor-6-ethyl-9,10-dihydrolysergic acid methyl ester (V) being active but much less potent than apomorphine. Compound VI was evaluated for its effect on blood pressure; at a dose of 30 mg/kg ip, it significantly lowered, diastolic pressure in normotensive rats.
mesh_terms: D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D055598:Chemical Phenomena; D002621:Chemistry; D004873:Ergolines / Q000138:chemical synthesis*; D006801:Humans; D008237:Lysergic Acid / Q000031:analogs & derivatives / Q000138:chemical synthesis* / Q000494:pharmacology / Q000633:toxicity; D009043:Motor Activity / Q000187:drug effects; D051381:Rats; D011919:Rats, Inbred Strains; D013239:Stereotyped Behavior / Q000187:drug effects*; D013997:Time Factors
chemical_list: D004873:Ergolines; C033307:6-nor-9,10-dihydrolysergic acid methyl ester; D008237:Lysergic Acid