Description: PI3K/mTOR Inhibitor-1, a Sulfonyl-Substituted Morpholinopyrimidines based analog, is a novel, potent, orally bioavailable dual PI3K/mTOR inhibitor with potential antitumor activity. and with IC50s of 20/376/204/46 nM and 186 nM for PI3Kα/PI3Kβ/PI3Kγ/PI3Kδ and mTOR, respectively. PI3K/mTOR Inhibitor-1 was identified as a potent dual PI3K/mTOR inhibitor whithc exhibited high inhibitory activity against PI3Kα/β/γ/δ (IC50 = 20/376/204/46 nM) and mTOR (IC50 = 189 nM), potent functional suppression of AKT phosphorylation (IC50 = 196 nM), and excellent antiproliferative effects on a panel of cancer cells. Enzymic data and modeling simulation indicate that a cyclopropyl ring on the C4 sulfone chain and a fluorine on the C6 aminopyridyl moiety are responsible for its maintained PI3K activity and enhanced mTOR potency, respectively. Furthermore, PI3K/mTOR Inhibitor-1 exhibited higher efficiency in the HT-29 colorectal carcinoma xenograft model at the daily dose of 3.75 and 7.5 mg/kg relative to BKM120 at the dose of 15 and 30 mg/kg.