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Ponatinib Hydrochloride

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Ponatinib Hydrochloride Basic information
Ponatinib Hydrochloride Usage And Synthesis
  • DescriptionIn December 2012, the US FDA approved ponatinib (also referred to as AP 24534) for the treatment of adult patients with chronic phase, accelerated phase, or blast phase chronicmyeloid leukemia (CML). Ponatinib is a pan-Bcr–Abl TKI that blocks both the native (IC50=0.4 nM) and Bcr– AblT315I mutated kinases (IC50=2.0 nM) in addition to othermutated kinases in CML patients. In the Ba/F3 cell proliferation assay, ponatinib inhibits ABL and the T315I Abl mutant with IC50s of 1.2 and 8.8 nM, respectively. Ponatinib was identified by a structure-based drug design approach. Ponatinib binds to the kinase domain in a DFG-out conformation; the ethynyl moiety helps the inhibitor evade the mutant gatekeeper isoleucine residue at position 315. In addition to Abl and the T315I mutant of Abl, ponatinib inhibits VEGFR, PDGFR, FGFR, SRC, KIT, RET, TIE2, FLT3, and EPH receptors at concentrations ranging from0.1 to 20 nM.
  • OriginatorAriad (United States)
  • UsesPonatinib is a tyrosine kinase inhibitors (TKI) and used to treat chronic myeloid leukemia (CML) (1,2,3). Ponatinib is also used in combination with other drugs, such as forskolin, to combat TKI resistance in patient with CML (3), targeted drug in small-cell lung cancer. Potent FAK inhibitor. FGFR/VEGFR/Bcr-Abl inhibitor It is a COVID19-related research product.
  • brand nameIclusig
  • Clinical UsePonatinib hydrochloride (Iclusig ®), previously known as AP24534, is a multi-targeted tyrosine kinase inhibitor approved in the US as an oral treatment for resistant or intolerant chronic myeloid leukemia (CML) and Philadelphia chromosome-positive (Ph+) acute lymphoblastic leukemia (ALL). Ponatinib hydrochloride was designed for treatment of tumors containing the T351I mutation which are present in some forms of CML and resistant to traditional therapies such as imatinib. Ponatinib hydrochloride was developed by Ariad Pharmaceauticals, and operates by a similar mechanism of action as other tyrosine kinase inhibitors, inhibiting the enzymatic activity of BCR-ABL, an abnormal tyrosine kinase responsible for unregulated and excess white blood cell production by bone marrow. However, the ability of ponatinib hydrochloride to target isoforms of the BCR-ABL gene typically leading to resistance in other known tyrosine kinase inhibitors provides an alternate form of therapy not previously available.
  • Chemical SynthesisA significant amount of research has been devoted towards identification of a manufacturing synthesis of ponatinib hydrochloride. A majority of methods rely on two key Sonagashira couplings to generate the imidazo[1,2-b]pyridazin-3-ylethynyl framework. The most likely process scale method begins with 3-bromo-imidazo[1,2-b]pyridazine (135) (the Scheme). Direct Sonogashira coupling of (135) with ethynyltrimethylsilane (136) in the presence of Pd(PPh3)4 and CuI, followed by treatment with TBAF/THF led to the desired alkynyl imidazo[1,2-b]pyridazine 138 in 71 and 94% yields, respectively. Alkyne 138 was then coupled under similar Sonogashira conditions with functionalized aryl iodide 139 (generated in two steps from 3-iodo-4-methylbenzoic acid (140) and commercially available piperazinyl aniline 141) providing ponatinib free base, which was then immediately treated with EtOH/HCl at room temperature to ultimately furnish ponatinib hydrochloride (XXI).

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