Myocardial regeneration promoting compounds, preparation method thereof, and pharmaceutical composition

A compound represented by Formula (I) below:

• where X1 is a hydrogen atom or an unsubstituted alkyl group having 1 to 6 carbon atoms;
• X2 is an oxygen atom or an amino group;
• X3 is a hydrogen atom, a hydroxyl group, or *—X2—(CO)—(Y)p—Z group;
• Y is an alkylene group having 1 to 6 carbon atoms, an alkenylene group having 2 to 12 carbon atoms, an arylenealkylene group having 7 to 18 carbon atoms, or an arylene group having 6 to 18 carbon atoms;
• Z is *—COCH3, *—COOH, *—COOCH3, *—OCOCH3, *—NHCOOC(CH3)3, *—F, *—Cl, *—Br, or *—I;
• and
• p is 0 or 1,
• wherein, when X1 is a hydrogen atom, X3 is a hydrogen atom, and Y is an arylenealkylene group having 7 to 18 carbon atoms, Z is *—COOH, *—COOCH3, *—OCOCH3 or *—NHCOOC(CH3)3;
• wherein, when X1 is a hydrogen atom, X3 is a hydrogen atom, and Y is an arylene group having 6 to 18 carbon atoms, Z is *—COCH3, *—COOH, *—OCOCH3, or *—NHCOOC(CH3)3;
• or
• wherein, when X1 is a hydrogen atom, X3 is a hydrogen atom, and Y is an alkylene group having 1 to 6 carbon atoms or an alkenylene group having 2 to 12 carbon atoms, Z is *—COCH3, *—COOH, *—COOCH3, *—OCOCH3, *—NHCOOC(CH3)3, *—F, *—Cl, *—Br, or *—I,
• wherein, when X1 is an unsubstituted alkyl group having 1 to 6 carbon atoms and Y is an arylene group having 6 to 18 carbon atoms, Z is *—COCH3, *—COOH, *—COOCH3, *—NHCOOC(CH3)3, *—F, *—Cl, *—Br, or *—I, and
• wherein, when X1 is an unsubstituted alkyl group having 1 to 6 carbon atoms and Y is an alkylene group having 1 to 6 carbon atoms, an alkenylene group having 2 to 12 carbon atoms or an arylenealkylene group having 7 to 18 carbon atoms, Z is *—COCH3, *—COOH, *—COOCH3, *—OCOCH3, *—NHCOOC(CH3)3, *—F, *—Cl, *—Br, or *—I.