Total synthesis of antiparasitic natural products: Nafuredin and Borrelidin

ORGN 349

Tohru Nagamitsu, nagamitsut@pharm.kitasato-u.ac.jp, School of Pharmaceutical Sciences, Kitasato University, Shirokane 5-9-1, Minato-ku, Tokyo, 108-8641, Japan
Useful antiparasitic natural products produced by microorganisms, as typified by the avermectins, have been discovered by Prof. Satoshi Omura and co-workers at the Kitasato Institute. In addition, two antiparasitic natural products, nafuredin and borrelidin, have recently been isolated. Nafuredin selectively inhibits NADH-fumarate reductase, which plays a role in a part of the electron transport system involved in energy metabolism found in many anaerobic organisms such as helminths. Borrelidin shows potent antimalarial activity against chloroquine-resistant parasite strains. To facilitate easy access to simplified analogues for structure-activity relationship studies, we have developed methods for the total synthesis of both nafuredin and borrelidin. In this presentation, we detail the results of this total synthesis.