Indole Alkaloids of Kopsia dasyrachis Ridl. From the leaves of Kopsia dasyrachis Ridl. three new indole alkaloids, kopsidasine‐N‐oxide (1), kopsidasine (2) and kopsidasinine (3) have been isolated. Reduction of 1 with SO2 afforded 2; treatment of 2 with m‐chloroperbenzoic acid gave 1. The structure elucidation of 1 and 2, and the deternmination of their relative configurations are based mainly on the correlation of derivative 6 with the known ring skeleton of pleiocarpine (9) (Scheme 1). The structure of 3 has been established via its Hofmann degradation product 13 also prepared by treatment of 2 with CH3I (Scheme 3). Copyright © 1982 Verlag GmbH & Co. KGaA, Weinheim