PF-06751979

• CAT Number: I020083
• CAS Number: 1818339-66-0
• Molecular Formula: C18H19F2N5O3S2
• Molecular Weight: 455.50
• Purity: ≥95%
• Synonyms: N-[2-[(4aR,6S,8aR)-2-amino-6-methyl-4a,5,6,8-tetrahydro-4H-pyrano[3,4-d][1,3]thiazin-8a-yl]-1,3-thiazol-4-yl]-5-(difluoromethoxy)pyridine-2-carboxamide
• InChI: InChI=1S/C18H19F2N5O3S2/c1-9-4-10-6-30-17(21)25-18(10,8-27-9)15-24-13(7-29-15)23-14(26)12-3-2-11(5-22-12)28-16(19)20/h2-3,5,7,9-10,16H,4,6,8H2,1H3,(H2,21,25)(H,23,26)/t9-,10-,18-/m0/s1
• InChIKey: ZLZUHACSRMOLLV-RAALSFIWSA-N
• SMILES: CC1CC2CSC(=NC2(CO1)C3=NC(=CS3)NC(=O)C4=NC=C(C=C4)OC(F)F)N

PF-06751979 is a potent, brain penetrant, β-site amyloid precursor protein cleaving enzyme 1 (BACE1) inhibitor with an IC50 of 7.3 nM in BACE1 binding assay.
PF-06751979 shows improved selectivity over BACE2 (IC50=194 nM) in binding (27-fold) relative to the literature examples and across multiple chemical series in BACE1 program. PF-06751979 also inhibits BACE1 and BACE2 in a fluorescent polarization (FP) assay with IC50s of 26.9 nM and 238 nM, respectively. PF-06751979 has excellent potency at BACE1 in binding or FP assay formats along with cellular activity looking at production of sAPPβ in H4 cells with an IC50 of 5 nM[1].
PF-06751979 displays excellent brain penetration, potent in vivo efficacy, and broad selectivity over related aspartyl proteases including BACE2. Acute administration of PF-06751979 yields a robust dose-responsive and time-dependent reduction of cerebral spinal fluid (CSF) Aβx-40 with peak inhibition at 3 h of >77%. To determine if the reduction in brain and CSF Aβ is maintained during sustained exposure to PF-06751979, a 5 day subchronic study is executed, dosing once daily by subcutaneous (SC) administration (10 or 50 mg/kg/day). Brain and CSF samples are collected on day 5, following the last dose. PF-06751979 produces a dose-responsive and time-dependent inhibition of Aβ42 in mouse brain. At the 50 mg/kg/day dose, maximal brain lowering is 63% at 7 to 9 h. Administration of PF-06751979 (10 or 50 mg/kg/day for 5 days) produces a dose-responsive and time-dependent inhibition of Aβx-40 in mouse CSF resulting in 77% inhibition of CSF at 3 h post-final 50 mg/kg dose[1].

Reference

[1]. O’Neill BT, et al. Design and Synthesis of Clinical Candidate PF-06751979: A Potent, Brain Penetrant, β-Site Amyloid Precursor Protein Cleaving Enzyme 1 (BACE1) Inhibitor Lacking Hypopigmentation. J Med Chem. 2018 May 24;61(10):4476-4504.
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