14-deoxy-14.alpha.-cardenolides 3.beta.-thioderivatives and pharmaceutical composition comprising same for treating cardiovascular disorders

14-deoxy-14.alpha.-cardenolides 3.beta.-thioderivatives, having formula (I):

• ##STR6## wherein:
• the symbol --- represents a single or a double bond;
• R is C2-C6 alkyl or C3-C6 alkenyl, substituted by a 2-(2-imidazolinyl) group or one or more OR1 or NR2R3 or C(NH)NR4R5;
• wherein:
• R1 is C2-C4 alkyl substituted by NR6R7;
• R2, R3 are independently C2-C6 alkyl substituted by NR6R7 or R2 and R3 taken together with the nitrogen atom form an unsubstituted or substituted saturated or unsaturated heteromonocylic ring optionally containing another heteroatom chosen from oxygen or sulfur or nitrogen;
• R4, R5 taken together with the nitrogen atom form a penta- or hexa-monoheterocyclic ring;
• R6, R7 taken together with the nitrogen atom form a saturated or unsaturated penta- or hexa-monoheterocyclic ring optionally containing another heteroatom chosen from oxygen or sulfur or nitrogen, or the pharmaceutically acceptable salts thereof.