Furan derivatives and preparation method and application thereof

The invention belongs to the technical field of medicines and provides furan derivatives with a structure shown as a general formula I and medicinal salts of the furan derivatives. R1, R2 and R3 are shown in the specification. The invention also relates to a method for preparing the compounds, and discloses a medical composition in which the compounds or pharmaceutically acceptable salts of the compounds are taken as active ingredients, and use of the compounds and the pharmaceutically acceptable salts of the compounds as antitumor medicines.