(-)-Multiflorine isolatedfrom leguminous plants produces a hypoglycemic effect when administered to mice with streptozotocin-induced diabetes. (-)-Multiflorine has an enaminone-type conjugation on the A ring, which is unusual in lupinealkaloids. Proceeding on the assumption that the A-B ring is responsible for the hypoglycemic effect, several compounds bearing the quinolizidin-2-one ring system were