Discovery of a Series of 5,11-Dihydro-6H-benzo[e]pyrimido[5,4-b][1,4]diazepin-6-ones as Selective PI3K-δ/γ Inhibitors. 2016

Fleur M Ferguson, and Jing Ni, and Tinghu Zhang, and Bethany Tesar, and Taebo Sim, and Nam Doo Kim, and Xianming Deng, and Jennifer R Brown, and Jean J Zhao, and Nathanael S Gray
Department of Cancer Biology, Dana-Farber Cancer Institute , Boston, Massachusetts 02215, United States.

Dual inhibition of PI3K-δ and PI3K-γ is an established therapeutic strategy for treatment of hematological malignancies. Reported molecules targeting PI3K-δ/γ selectively are chemically similar and based upon isoquinolin-1(2H)-one or quinazolin-4(3H)-one scaffolds. Here we report a chemically distinct series of potent, selective PI3K-δ/γ inhibitors based on a 5,11-dihydro-6H-benzo[e]pyrimido[5,4-b][1,4]diazepin-6-one scaffold with comparable biochemical potency and cellular effects on PI3K signaling. We envisage these molecules will provide useful leads for development of next-generation PI3K-δ/γ targeting therapeutics.

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