The invention provides a compound of Formula I, or its tautomer, mesomer, racemate, enantiomer, diastereoisomer or a mixture thereof, or a pharmaceutically acceptable salt or solvate of the compound of Formula I, its tautomer, mesomer, racemate, enantiomer, or diastereoisomer. Ring A, R 1 , R 2 , R 3 and R 4 are as defined in the specification. The invention further provides a method for preparing the compound of Formula I and their use in the manufacture of a medicament for the treatment of a cell proliferative disorder.