Table 1.
In vitro ERK 2 and PI3Kα inhibitory activities of compounds 16a~16d.

| Entry | R1 | R2 | ERK2 Inhibition% (1 μM) | PI3Kα Inhibition% (1 μM) |
|---|---|---|---|---|
| 16a |
|
|
98.3 | 8.7 |
| 16b |
|
|
84.8 | 27.4 |
| 16c |
|
|
97.2 | 1.8 |
| 16d |
|
|
79.5 | 4.0 |
| BVD-525 | 97.7 | ND | ||
| BYL-719 | ND | 96.7 |
ND = not determined.