In our study compounds with pyrido[3,2-]pyrimidine and pyrido[3,4-]pyrimidine were designed, synthesized and evaluated for their biological activity against hematologic tumors. The biological activity of compounds was evaluated by ADP-Glo Luminescence assay, MTT [3-(4,5)-dimethylthiahiazo (-z-y1)-3,5-di- phenytetrazoliumromide] assay, western blotting and flow cytometry, respectively. Compounds , and containing pyrido[3,2-]pyrimidine inhibited phosphoinositide 3-kinase-δ (PI3Kδ) at subnanomolar levels and had good δ-isoform selectivity. , and showed significant inhibitory effects against SU-DHL-6 cells and effectively inhibited Akt phosphorylation in a good concentration-dependent manner. induced apoptosis and caused cell cycle arrest in SU-DHL-6 cells. Docking studies showed that , and bound tightly to PI3Kδ through key hydrogen bonding interactions. This study suggests that employing pyrido[3,2-]pyrimidine can facilitate the design of novel potent and selective PI3Kδ inhibitors.
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