FXR small-molecule agonist, and preparation method therefor and use thereof

A compound represented by general formula I, or a tautomer, or pharmaceutically acceptable salt thereof,

• wherein R11, R12, R13, R14 and R15 are each independently hydrogen, halogen, halogenated C1-6 alkyl, halogenated C1-C6 alkoxy, C1-C6 alkyl, C1-6 alkoxy, C3-C6 cycloalkyl, C3-C6 cycloalkoxy, cyano or nitro;
• R2 is C6-C12 aryl, C1-C6 alkyl or C3-C6 cycloalkyl;
• A is the following substituted or unsubstituted group:
• phenyl, pyridyl, thienyl, furyl, indazolyl, indolyl, benzothienyl, benzofuranyl, and the “substituted” means that there is one, two or three substituents selected from the group consisting of halogen, C1-C6 alkyl, halogenated C1-6 alkyl, halogenated C1-C6 alkoxy, C3-C6 cycloalkyl, C1-C6 alkoxy, and C3-C6 cycloalkoxy.