DE NOUVEAUX ALCALOÏDES QUATERNAIRES DU STRYCHNOS USAMBARENSIS

Abstract

We have isolated and identified three quaternary monomeric alkaloids from barks of Strychnos usambarensis roots. Besides Macusine–B, previously found in Strychnos toxifera, two new products are described: O–methyl–Macusine–B and O–methyl-dihydro–Macusine–B. It is not easy to discuss the origin of these last alkaloids that take form perhaps during the extraction. The purification is very laborious because Strychnos usambarensis contains more than sixty alkaloids.