C‐13‐alkylated methoxy‐8H‐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 1,2,3,4‐tetrahydro‐6,7‐dirnethoxy‐1‐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.
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Weimar et al. (1991) studied this question.
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