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).
通过相应的原小-8碱(1)通过13-亚甲基-8、14-环小bin碱的光
化学环化反应,有效地合成了13-甲基小ber碱(6a),脱氢科达林(6b)和corysamine(6c及其四氢衍
生物(9a - c)。(3)。