Umwandlung von Cardenoliden durch Mikroorganismen. V. Hydroxylierung und Dehydrierung durch Psilocybe semperviva H EIM et C AILLEUX und Psilocybe mexicana H EIM . 11. Mitteilung über Reaktionen mit Mikroorganismen

Digitoxigenin was transformed by growing cultures of Psilocybe mexicana HEIM to 7β‐hydroxydigitoxigenin, 3‐dehydrodigitoxigenin, 3‐dehydro‐7β‐hydroxydigitoxi‐genin and to digoxigenin. Incubation of digitoxigenin with Psilocybe sewperviva CAILLEUX ct HEIM yielded Digoxigenin as main product. 3‐Dehydrodigitoxigenin was oxygenated to 3‐dehydro‐7β‐hydroxydigitoxigenin by P. mexicana and hydrogenated to digitoxigenin and hydroxylated to digoxigenin by P. semperviva. Strophanthidin was reduced to strophanthidol by P. semperviva.