Natural products longistylin A, longistylin C and cajanotone belong to stilbenes family and exhibit varieties of bioactivities. Using Horner-Wadsworth-Emmons (HWE) and 1,3-sigma rearrangement reactions as key steps, longistylin A and longistylin C have been successfully synthesized in six steps from 3,5-dimethoxy benzoic acid. Besides, using Barbier and 1,3-sigma rearrangement reactions as key steps, cajanotone has been first prepared in eight steps from 3,5-dihydroxy benzoic acid.