Synthesis of C-13-Alkylated 8-Oxoberbines
نویسندگان
چکیده
C-13-alkylated methoxy-8tf-dibenzo[a,g]quinolizin-8-ones 2a-e were synthesized by photocyclization of 1 -alkylidene-N-benzoyl-1,2,3,4-tetrahydroisoquinolines 1. Moreover, condensation of l,2,3,4-tetrahydro-6,7-dimethoxy-l-oxo-isoquinoline with homophthalic acid anhydrides 7a and b leads to the C-13-alkylated 8-oxoberbines 2b and c and improves the yields compared with those of the photocyclization method. Synthese von C-13-alkyIierten 8-Oxoberbinen
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