CAS No. 1707289-21-1

Formula C24H24Cl2N4O4

MolWeight 503.378

PHASE 1

BLU-554 is a potent fibroblast growth factor receptor 4 (FGFR4) inhibitor.
IC50 & Target: FGFR4^[1]
InVitro: Fibroblast growth factor receptor 4 (FGFR-4) is a protein that in humans is encoded by the FGFR-4 gene. This protein is a member of the fibroblast growth factor receptor family, where amino acid sequence was highly conserved between members throughout evolution. FGFR family members 1-4 differ from one another in their ligand affinities and tissue distribution. A full-length representative protein consists of an extracellular region composed of three immunoglobulin-like domains, a single hydrophobic membrane-spanning segment and a cytoplasmic tyrosine kinase domain. The extracellular portion of the protein interacts with fibroblast growth factors, setting in motion a cascade of downstream signals, ultimately influencing mitogenesis and differentiation. The genomic organization of the FGFR-4 gene encompasses 18 exons. Although alternative splicing has been observed, there is no evidence that the C-terminal half of the Iglll domain of this protein varies between three alternate forms, as indicated for FGFR 1-3^[1].

Neil Bifulco

Senior Scientist at Blueprint Medicines

Chandra Miduturu

Senior Scientist at Blueprint Medicines

Fibroblast growth factor receptor 4 (FGFR-4) is a protein that in humans is encoded by the FGFR-4 gene. This protein is a member of the fibroblast growth factor receptor family, where amino acid sequence was highly conserved between members throughout evolution. FGFR family members 1-4 differ from one another in their ligand affinities and tissue distribution. A full-length representative protein consists of an extracellular region composed of three immunoglobulin-like domains, a single hydrophobic membrane-spanning segment and a cytoplasmic tyrosine kinase domain. The extracellular portion of the protein interacts with fibroblast growth factors, setting in motion a cascade of downstream signals, ultimately influencing mitogenesis and differentiation. The genomic organization of the FGFR-4 gene encompasses 18 exons. Although alternative splicing has been observed, there is no evidence that the C-terminal half of the Iglll domain of this protein varies between three alternate forms, as indicated for FGFR 1-3.

Ectopic mineralization, characterized by inappropriate calcium-phosphorus deposition in soft tissue, has been observed in rats treated with an FGFR-1 inhibitor (Brown, AP et al. (2005), Toxicol. Pathol., p. 449-455). This suggests that selective inhibition of FGFR-4 without inhibition of other isoforms of FGFR, including FGFR-1, may be desirable in order to avoid certain toxicities. FGFR-4 preferentially binds fibroblast growth factor 19 (FGF19) and has recently been associated with the progression of certain sarcomas, renal cell cancer, breast cancer, and liver cancer.

PATENT

WO 2016105582

PATENT

WO 2015061572

Synthetic Protocol 3

2-chloro-6-(2,6-dichloro-3,5-dimethoxyphenyl)quinazoline (described in WO 2014011900) can be substituted with an 1,2-mono-protected cycloalkyldiamine under various nucleophilic aromatic substitution reaction conditions using a base (such as diisopropylethylamine (DIPEA), DBU or NaHC0₃) in a polar solvent (such as dioxane, CH CN or NMP) or via a palladium-mediated Buchwald coupling reaction to provide the diamine- substituted quinazoline. The protecting group on the amine is removed to reveal the amine on the cycloalkane. The amine can be reacted with propiolic acid using amide coupling reaction conditions or reacted with acryloyl chloride to prepare the acrylamide. As shown below, Compounds 27, 32, 34, 36, and 40 were prepared using Synthetic Protocol 3.

Compound 40

Synthesis of N-((3S,4S)-3-((6-(2,6-dichloro-3,5-dimethoxyphenyl)quinazolin-2-yl)amino)tetrahydro-2H-pyran-4-yl)acrylamide

Step 1: Synthesis of N-((3S,4S)-4-azidotetrahydro-2H-pyran-3-yl)-6-(2,6-dichloro-3,5-dimethoxyphenyl)quinazolin-2-amine

(3S,4S)-4-azidotetrahydro-2H-pyran-3-amine, HC1 (0.200 g, 1.120 mmol) and 2-chloro-6-(2,6-dichloro-3,5-dimethoxyphenyl)quinazoline (0.318 g, 0.861 mmol) were taken up in NMP (2 ml) and sodium carbonate (0.217 g, 2.58 mmol) was added. The reaction was heated to 100 °C overnight. After cooling to ambient temperature the reaction was poured into 5ml of water and stirred for 30 min. The solid layer was filtered off and washed with water and further dried under high vacuum to give N-((3S,4S)-4-azidotetrahydro-2H-pyran-3-yl)-6-(2,6-dichloro-3,5-dimethoxyphenyl)quinazolin-2-amine (0.300 g, 0.631 mmol, 73.3 % yield). MS (ES+) C₂₁H₂₀CI₂N₆O₃requires: 474, found: 475 [M + H]+.

Step 2: Synthesis of (3S,4S)-N3-(6-(2,6-dichloro-3,5-dimethoxyphenyl)quinazolin-2-yl)tetrahydro-2H-pyran-3,4-diamine

N-((3S,4S)-4-azidotetrahydro-2H-pyran-3-yl)-6-(2,6-dichloro-3,5-dimethoxyphenyl)quinazolin-2-amine (0.063 g, 0.133 mmol) was taken up in Methanol (7 ml) and EtOAc (7.00 ml), Pd-C (0.014 g, 0.133 mmol) was added and stirred under a ¾ balloon for 1 hour. After the reaction was completed, it was filtered through celite and the solvent removed. (3S,4S)-N3-(6-(2,6-dichloro-3,5-dimethoxyphenyl)quinazolin-2-yl)tetrahydro-2H-pyran-3,4-diamine (0.060 g, 0.134 mmol, 101 % yield) was recovered as a yellow solid, which was carried on without further purification. MS (ES+) C₂₁H₂₂CI₂N₄O₃ requires: 448, found: 449 [M + H]+.

Step 3: Synthesis of N-((3S,4S)-3-((6-(2,6-dichloro-3,5-dimethoxyphenyl)quinazolin-2-yl)amino)tetrahydro-2H-pyran-4-yl)acrylamide

(3S,4S)-N3-(6-(2,6-dichloro-3,5-dimethoxyphenyl)quinazolin-2-yl)tetrahydro-2H-pyran-3,4-diamine (0.060 g, 0.134 mmol) was taken up in CH₂CI₂ (2 ml) and cooled to 0 °C, followed by addition of DIEA (0.023 ml, 0.134 mmol) and then acryloyl chloride (0.012 ml, 0.147 mmol) slowly. The reaction was stirred at 0 °C for 30 minutes, then the mixture was loaded directly onto silica and purified by flash chromotography using 0-10% CH₂Cl₂/MeOH. N-((3S,4S)-3-((6-(2,6-dichloro-3,5-dimethoxyphenyl)quinazolin-2-yl)amino)tetrahydro-2H-pyran-4-yl)acrylamide (0.041 g, 0.081 mmol, 61% yield) was recovered as an off white solid. MS (ES+) C₂₄H₂₄CI₂N₄O₄ requires: 502, found: 503 [M + H]+.