CPC C07D 498/22 (2013.01) [C07B 2200/05 (2013.01)] | 19 Claims |
1. A compound of formula IIa, or a pharmaceutically acceptable salt thereof, wherein:
X is CH, CR1 or N;
Y is CH, CR1 or N;
R1 is independently selected from the group consisting of a C1-C3 alkyl, a C1-C3 haloalkyl, and a halogen;
R2 is selected from a C1-C3 alkyl and an isotopically labelled C1-C3 alkyl;
R3 is selected from the group consisting of a halogen, a cyano, and a C1-C3 haloalkyl;
R4 is selected from the group consisting of a C1-C3 alkyl, an isotopically labelled C1-C3 alkyl, a C1-C3 haloalkyl, a O—C1-C3 alkyl, an isotopically labelled O—C1-C3 alkyl, a O—C1-C3 haloalkyl, and a O—C3-C6 cycloalkyl;
n is 0, 1 or 2.
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