Photocyclisation of 2-aroyl-1-ethylidene-1,2,3,4-tetrahydroisoquinolines, which exist in two geometric forms, provides a useful route to various 13-methylberbines, as exemplified by the first total synthesis of (±)-cavidine.
I. Ninomiya, T. Naito and H. Takasugi, J. Chem. Soc., Perkin Trans. 1, 1975, 1791 DOI: 10.1039/P19750001791
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