Protoberberines with the unusual 3,10‐dimethoxy substitution are synthesized by photocyclization of E‐and Z‐1‐ethylidene‐1,2,3,4‐tetrahydro‐6‐methoxy‐2‐(3‐methoxybenzoyl)isoquinolines.
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Chinnasamy et al. (1987) studied this question.
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