Annona ambotay in 1987 by de Oliveira et al.[1a] Several years later, Dos Santos et al.[1b] reported the isolation from Annona dioica collected in Brazil, but no total synthesis has been published so far. Kalasinamide (1) was discovered by Tuchinda et al.[2] in 2000 in Polyalthia suberosa collected in Thailand. Very recently Gandy and Piggott published the first total synthesis of kalasinamide (1).[3] Marcanine A (2) was isolated by Soonthornchareonnon ...
