| 摘要 |
Ergoline derivatives of general Formula I <IMG> wherein C8<IMG>C9 and C9<IMG>C10 are both CC-single bonds or one is a C=C-double bond, R6 is C1-4 alkyl, R8 is methyl, hydroxymethyl, carbonylmethoxy, ureido or N,N-diethylureido, each in the .alpha.- or .beta.-posi-tion, and R is hydrogen or nitro, are prepared by dehydrogenation of corresponding 2,3-dihydroergoline derivatives using an electrophilic reagent in an apolar solvent and a base.
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