Alkaloids of thalictrum—XXIII : Four new aporphine-benzylisoquinoline dimeric alkaloids from thalictrum revolutum

Structures based on physical and chemical methods, are proposed for four new aporphine-ben-zylisoquinoline dimers. Thalirevolutine ( 1) and thalirevoline ( 2) are related to fetidine ( 5), the latter is isomeric with fetidine bearing the phenolic group at C-4″, and the former is O methylfetidine. Thalilutidine ( 3) is the C-6' phenolic analogue of thalicarpine ( 6), while thalilutine ( 4) is the C-3 phenolic analogue of adiantifoline ( 13).