The invention relates to fields of insecticides and fungal inhibitors, and concretely relates to an alga bromosesquiterpene compound, a preparation thereof and an application thereof. The concrete structural formula of the compound is represented by formula (I). The preparation method of the compound comprises the following steps : drying and crushing red alga Laurencia composita, and extracting with an organic solvent to obtain crude extracts; and carrying out silica gel column chromatography on the crude extracts, carrying out gradient elution, and separating and purifying components obtained through gradient elution with an eluent volume ratio of 15-10 : 1 to obtain the target compound (I). Results of insecticidal activity experiments of the bromosesquiterpene compound obtained in the invention show that the lethality of 100mug/ml of the compound to artemia is 87.7%, the median lethal concentration is 37.0mug/ml, and the compound simultaneously has a good antifungal activity.
修改评论