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Communication | Regular issue | Vol 27, No. 7, 1988, pp.1603-1606
Published online, 1st January, 1970
DOI: 10.3987/COM-88-4574
■ Synthesis of Corynantheine Alkaloids with (19E)-Ethylidene Group: On the Structures of Rhazimanine and Bhimberine

Takeaki Naito, Tetsuro Shinada, Okiko Miyata, Ichiya Ninomiya,* and Toshimasa Ishida

*Kobe Women’s College of Pharmacy, Motoyamakita, Higashinad, Kobe, Hyogo 658, Japan

Abstract

Syntheses of four indoloquinolizidine alkaloids having a (19E)-ethylidene group at the 20-position, (±)-isositsirikine (1), (±)-16-epiisositsirikine (2), and the proposed structures of (±)-rhazimanine (3) and (±)-bhimberine (4), were accomplished and have suggested that the structures of rhazimanine (3) and bhimberine (4) require revision.