Compounds according to Formula I are provided: and salts thereof, wherein Q1, Q2, R3, R4, X, and Y are as defined herein. Methods for preparing compounds of Formula I are also provided, as well as methods of treating cellular proliferative disorders, such as cancer, using compounds of Formula (I). Q2-X&mdashY&mdashCHR3&mdashCHR4-Q1&emsp&emsp(I)