or a stereoisomer, tautomer or pharmaceutically acceptable salt thereof wherein X1, X2, R1, R2, R3 and n are as defined herein. Also described are pharmaceutically acceptable compositions of Formula (I) compounds as well as methods for utilizing the compounds of Formula (I) and the pharmaceutically acceptable compositions of Formula (I) compounds as inhibitors of Mnk as well as therapeutics for the treatment of diseases such as cancer.
