Isolation of three novel sulphur-containing phytoalexins from the chinese cabbage Brassica campestris L. ssp. pekinensis(cruciferae)

Abstract

Inoculation of Chinese cabbage heads with the bacterium Pseudomonas cichorii induced the production of three major phytoalexins named methoxybrassinin (1), brassinin (2), and cyclobrassinin (3), whose structures have been elucidated on the basis of spectroscopic studies and synthesis.