The present invention relates to compounds according to Formula (I): or a stereoisomer, tautomer or pharmaceutically acceptable salt thereof, wherein R1, R2, R3, R4a, R4b, R5, R6, R7, R8, W1, W2, Y 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.