Discovery of a Novel Tricyclic 4H-Thiazolo[5',4':4,5]pyrano[2,3-c]pyridine-2-amino Scaffold and its Application in a PI3K Inhibitor with High PI3K Isoform Selectivity and Potent Cellular Activity

A novel, previously undescribed 4H-thiazolo[5',4':4,5]pyrano[2,3-c]pyridine tricyclic scaffold has been discovered. The application of this novel chemotype leading to a potent and selective prototype PI3K inhibitor is described

Identification and optimisation of 4,5-dihydrobenzo[1,2-d:3,4-d]bisthiazole and 4,5-dihydrothiazolo[4,5-h]quinazoline series of selective phosphatidylinositol-3 kinase alpha inhibitors

Abstract: A cyclisation within a 4',5-bisthiazole (S)-proline-amide-urea series of selective PI3Kα inhibitors led to a novel 4,5-dihydrobenzo[1,2-d:3,4-d]bisthiazole tricyclic sub-series. The synthesis and optimisation of this 4,5-dihydrobenzo[1,2-d:3,4-d]bisthiazole sub-series and the expansion to a related tricyclic 4,5-dihydrothiazolo[4,5-h]quinazoline sub-series are described. From this work analogues inclusing 11, 12, 19 and 23 were identified as potent and selective PI3Kα inhibitor in vivo tool compounds