Organoselenium compounds, method for producing same, and pharmaceutical uses thereof in particular as antitumor agents

A selenium compound having the following general formula (I):

• where
• R1=a radical selected from a non substituted linear, branched or cyclic saturated carbon containing radical with 1 to 26 carbon atoms, and a substituted linear, branched or cyclic saturated carbon containing radical with 1 to 26 carbon atoms which is substituted by at least one substituent selected from the group consisting of one or more fluorine atoms, one or more carbon-carbon double bonds, at least one OH group, and at least one amino group;
• R2=H, R4C(═O), R4OC(═O), α-aminoacyl, CH3SeCH2CH2CH(NH2)C(═O), CH3SeCH2CH2CH(OH)C(═O);
• X=OH, OR3, NH2, NR4R5, α-amino acid, CH3SeCH2CH2CH(COOH)NH—, CH3SeCH2CH2CH(COOH)O—;
• R3=alkyl;
• R4=alkyl, aryl;
• R5=H, alkyl, aryl;
• R4 and R5 being capable of forming together a 5- or 6-membered cycloalkyl radical which can comprise a heteroatom;
• provided that X≠NH-tert-butyl, and any stereoisomers or the pharmaceutically accepted acid or base salts thereof.