13-Methylberberine (6a), dehydrocorydaline (6b), and corysamine (6c, and their tetrahydro derivatives (9a–c) were efficiently synthesised from the corresponding protoberberines (1) through photochemical electrocyclic reaction of 13-methylene-8, 14-cycloberbines (3).
M. Hanaoka, S. Yoshida and C. Mukai, J. Chem. Soc., Chem. Commun., 1985, 1257 DOI: 10.1039/C39850001257
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