US11542261, Compound quizartinib 1-(5-Tert-Butyl-1,2-Oxazol-3-Yl)-3-(4-{7-[2-(Morpholin-4-Yl)ethoxy]imidazo[2,1-B][1,3]benzothiazol-2-Yl}phenyl)urea Quizartinib ASP-2689 N-(5-tert-Butyl-isoxazol-3-yl)-N'-{4-[7-(2-morpholin-4-yl-ethoxy)imidazo[2,1-b][1,3]benzothiazol-2-yl]phenyl}urea US10266535, Compound AC220 AC-220 AC 010220 AC 220 AC010220 AC220 BDBM50300690 CHEMBL576982 Quizartinib (AC220) US9216997, Quizartinib (positive compound)
- Zarrinkar, PP; Gunawardane, RN; Cramer, MD; Gardner, MF; Brigham, D; Belli, B; Karaman, MW; Pratz, KW; Pallares, G; Chao, Q; Sprankle, KG; Patel, HK; Levis, M; Armstrong, RC; James, J; Bhagwat, SS AC220 is a uniquely potent and selective inhibitor of FLT3 for the treatment of acute myeloid leukemia (AML). Blood 114: 2984-92 (2009)
- Chao, Q; Sprankle, KG; Grotzfeld, RM; Lai, AG; Carter, TA; Velasco, AM; Gunawardane, RN; Cramer, MD; Gardner, MF; James, J; Zarrinkar, PP; Patel, HK; Bhagwat, SS Identification of N-(5-tert-butyl-isoxazol-3-yl)-N'-{4-[7-(2-morpholin-4-yl-ethoxy)imidazo[2,1-b][1,3]benzothiazol-2-yl]phenyl}urea dihydrochloride (AC220), a uniquely potent, selective, and efficacious FMS-like tyrosine kinase-3 (FLT3) inhibitor. J Med Chem 52: 7808-16 (2009)
- Detection of In Vitro Inhibition Activity (Enzymatic Activity) In the experiments of in vitro enzymatic activity, the IC50 values of Compound 33, Compound 30, Compound 14, Compound 20, Compound 22, Compound 23, Compound 25, Compound 26, Compound 27, Compound 5, Compound 6, Compound 7, Compound 8, Compound 9, Compound 10, Compound 11, Compound 12, Compound 2, Compound 3, Compound 4, Compound 76, Compound 77, Compound 78, Compound 48, Compound 47, Compound 45, Compound 44, Compound 43 and AC220 on protein kinase FLT3, FLT3/ITD and BTK were determined. The intracellular segment regions of protein kinase FLT3, FLT3/ITD and BTK were cloned into the insect expression vector pAcG2T, and the proteins were expressed by using an insect expression system, BaculoGold Baculovirus Expression System (BD Pharmingen), with GST tag. The established vectors were transfected into SF9 packaging viruses, so as to infect the SF9-expressed proteins with the viruses.9 μL (6 ng/μL) of purified FLT3 and BTK protein kinase were reacted with 1 μL of three-fold gradient dilution of the above compounds (final concentrations of the agents were 10 μM, 3 μM, 1 μM, 0.3 μM, 0.1 μM, 0.03 μM, 0.01 μM, 0.003 μM), respectively, at room temperature for 4 hours;2 μL of ATP and 3 μL of substrate, Poly(4:1 Glu, Tyr)Peptide (Promega, US), were added (final concentrations are 10 μM and 0.2 μg/μL, respectively), and reacted at 37° C. for 1 hour;5 μL of reacted kinase solution was added into 5 μL of ADP-Glo (Promega, US) and reacted at room temperature for 40 min, the kinase reaction was stopped and the remained ATP was consumed;10 μL of kinase detection reagent was added to transfer ADP into ATP, and the newly obtained ATP was detected by using coupled luciferase/fluorescein reaction, then the IC50 values were calculated by using a plotting method based on the Envision reading (Table 3).The experimental results were shown in FIG. 2: the exemplary compounds of the present invention have a strong inhibitory effect on FLT3, FLT3/ITD and BTK protein kinase, and these results demonstrate that the Compound of the present invention is an inhibitor of FLT3 kinase and also inhibits FLT3/ITD and BTK kinase.