Synthesis and phytotoxicity evaluation of novel 6α,7β-dihydroxyvouacapan-17p-oic acid derivatives

The 6α,7β-dihydroxyvouacapan-17β-oic acid (1) isolated from Pterodon polygalaeflorus Benth has shown allelopathic and plant growth regulatory properties. Six novel esters of (1) were prepared and their effects on the radical growth of Sorghum bicolor L. and Cucumis sativus L. were evaluated.