Stereoselectivesynthesis of (±)-altiloxin A not only confirmed the relative configuration but also opened the route providing the phytotoxin. Absolute configuration of (−)-altiloxin A was clarified by correlation with (−)−11-acetoxydriman-8-o1.
By spectroscopic data, the structures of two new phytotoxins, altiloxins a and b from Phoma asparagi sacc., the incitant of stem blight disease on asparagus are elucidated.