Chromene and 1,1 a,2,7b-tetrahydrocyclopropacchromene pyridopyrazinediones as gamma-secretase modulators

摘要

wherein X, R1, R2a, R2b, R4a, R4b,R5a, R5b, R6, R7, y and z are as defined in the specification. Corresponding pharmaceutical compositions, methods of treatment, methods of synthesis, and intermediates are also disclosed.