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TRICYCLOHEXADECAHEXAENE DERIVATIVES FOR USE IN THE TREATMENT OF HEPATITIS C VIRUS

WO2015026454,  COMBINATIONS COMPRISING TRICYCLOHEXADECAHEXAENE DERIVATIVES FOR USE IN THE TREATMENT OF HEPATITIS C VIRUS

BRISTOL-MYERS SQUIBB COMPANY [US/US]; Route 206 and Province Line Road Princeton, New Jersey 08543 (US)

PATENT WO2015026454 [LINK]

WANG, Alan Xiangdong; (US).
LOPEZ, Omar D.; (US).
TU, Yong; (US).
BELEMA, Makonen; (US)

Example B-l

Example B-l Step a

To a solution of 4-bromobenzene-l,2-diamine (2.5 g, 13.37 mmol) in DCM (30 mL) was added (S)-2-((tert-butoxycarbonyl)amino)-3,3-dimethylbutanoic acid (3.09 g, 13.37 mmol), DIPEA (2.334 mL, 13.37 mmol) and HATU (5.08 g, 13.37 mmol). The reaction mixture was stirred at room temperature for 18 h. The reaction mixture was diluted with water and extracted with DCM. The organic phase was washed with brine, dried over Na₂S0₄, filtered and concentrated. The crude material was purified by ISCO using 40 g Redisep silica column, CHCl₃/MeOH as eluant to obtain (S)-tert-butyl ( 1 -((2-amino-4-bromophenyl)amino)-3 ,3 -dimethyl- 1 -oxobutan-2-yl) carbamate (1.82 g) as yellow solid. LC (Condition 1): R_t = 2.13 min. LC/MS: Anal. Calcd. for [M+H₂0]⁺ Ci₇H₂₇BrN₂0₄ : 402.12; found 402.2. 1H NMR (DMSO-d₆, δ = 2.50 ppm, 400 MHz): δ 9.35 – 9.21 (m, 1 H), 7.07 (d, J= 8.5 Hz, 1 H), 6.91 (d, J= 2.0 Hz, 1 H), 6.80 – 6.60 (m, 1 H), 5.25 – 5.01 (m, 2 H), 4.07 – 3.89 (m, 1 H), 1.52 – 1.34 (m, 9 H), 1.02 – 0.86 (m, 9 H).

Example B-l, Step b

Acetic acid (15 mL) was added to (S)-tert-butyl (l-((2-amino-4-bromo phenyl)amino)-3,3-dimethyl-l-oxobutan-2-yl)carbamate (1.8 g, 4.50 mmol) and the reaction mixture was heated to 65 °C for overnight. The volatile component was removed in vacuo, and the residue was co-evaporated with dry CH₂C1₂ (2 x 15 mL). The organic phase was washed with saturated NaHC0₃ solution, brine, dried over Na₂S0₄ and concentrated to obtain (S)-tert-butyl (l-(6-bromo-lH-benzo[d] imidazol-2-yl)-2,2-dimethyl propyl)carbamate (1.68 g) as yellow solid. LC (Condition 1): R_t = 2.19 min. LC/MS: Anal. Calcd. for [M+H]⁺ Ci₇H₂₅BrN₃0₂ : 381.11; found 382.2. 1H NMR (DMSO-dg, δ = 2.50 ppm, 300 MHz): δ 12.46 – 12.27 (m, 1 H), 7.82 – 7.65 (m, 1 H), 7.59 – 7.41 (m, 1 H), 7.29 (dt, J= 1.9, 8.5 Hz, 1 H), 7.12 – 6.90 (m, 1 H), 4.64 (d, J= 9.8 Hz, 1 H), 1.44 – 1.27 (m, 9 H), 0.88 (br. s., 9 H).

-1 Step c

To a solution of (S)-tert-butyl (l-(6-bromo-lH-benzo[d]imidazol-2-yl)-2,2-dimethyl propyl) carbamate (1.57 g, 4.11 mmol) in dioxane (25 mL) was added bis (pinacolato)diboron (1.564 g, 6.16 mmol) and potassium acetate (1.209 g, 12.32 mmol). The reaction mixture was purged with argon for 10 min then PdCl₂(dppf) (0.150 g, 0.205 mmol) was added to the above reaction mixture and again purged with argon for 5 min. The reaction mixture was heated to 90 °C for overnight. The reaction mixture was diluted with water (15 ml) and extracted with EtOAc (2 x 25 ml). The combined organic phase was washed with brine, dried over Na₂S0₄ and concentrated in vacuo. The crude material was purified by ISCO using 40 g Redisep column, hexane/ethyl acetate as eluant to afford (S)-tert-butyl (2,2-dimethyl-l-(6-(4,4,5 ,5-tetramethyl- 1 ,3 ,2-dioxaborolan-2-yl)- 1 H-benzo[d]imidazol-2-yl)propyl) carbamate (1.35 g) as yellow solid. LC (Condition 1): R_t = 2.21 min. LC/MS: Anal. Calcd. for [M+H]⁺ C₂₃H₃₇BN₃0₄ : 430.29; found 430.4. 1H NMR (CD₃OD, δ = 3.34 ppm, 400 MHz): δ 7.98 (s, 1 H), 7.65 (dd, J= 1.0, 8.5 Hz, 1 H), 7.53(d, J= 8.5 Hz, 1 H), 4.73 (br. s., 1 H), 1.37 (s, 12 H), 1.24 (m, 9 H), 1.01 (s, 9 H).

-1 Step d

To a solution of (S)-tert-butyl (2,2-dimethyl-l-(6-(4,4,5,5-tetramethyl-l,3,2-dioxaborolan-2-yl)-lH-benzo[d]imidazol-2-yl)propyl)carbamate (1.114 g, 2.59 mmol) and 4,16-dibromo[2,2]paracyclophane (0.38g, 1.038 mmol) in dioxane (10 mL) was added Cs₂C0₃ (0.845 g, 2.59 mmol) in water (2 mL) and degassed for 10 min.

PdCl₂(dppf) (0.038 g, 0.052 mmol) was added to the above reaction mixture and again degassed for 5 min. The reaction mixture was heated to 90 °C for 12 h. Then the reaction mixture was filtered to get Example B-1 Step d which was taken for next step without further purification. LC (Condition 1): R_t = 2.54 min. LC/MS: Anal. Calcd. for [M+H]⁺ ^₀Η₆₃Ν₆Ο₄ : 811.49; found 811.6. 1H NMR (DMSO-d₆, δ = 2.50 ppm, 300 MHz): δ 12.36 (br. s., 2 H), 7.85 – 7.52 (m, 4 H), 7.32 (d, J= 7.9 Hz, 2 H), 7.05 (br. s., 2 H), 6.89 – 6.67 (m, 4 H), 6.54 (br. s., 2 H), 4.72 (d, J= 8.7 Hz, 2 H), 3.57 – 3.44 (m, 2 H), 3.07 (br. s., 2 H), 2.83 (br. s., 2 H), 2.65 (br. s., 2 H), 1.36 (s, 18 H), 1.08 – 0.91 (m, 18 H).

-1 Step e

HC1 in dioxane (4 mL, 24.00 mmol) was added to Example B-1 Step d (0.1 g,

0.102 mmol), and the reaction mixture was allowed to stir at RT for 2 h. Completion of the reaction was monitored by LCMS. The volatile component was removed in vacuo and the residue was washed with diethyl ether and dried to afford Example B-1 Step e (0.07 g) as yellow solid. LC (Condition 1): R, = 2.54 min. LC/MS: Anal.

Calcd. for [M+H]⁺ C40H47N6 : 611.39; found 611.4. 1H NMR (CD₃OD, δ = 3.34 ppm, 400 MHz): δ 7.90 (d, J= 13.1 Hz, 2 H), 7.83 (d, J= 8.5 Hz, 2 H), 7.61 (d, J= 8.5 Hz, 2 H), 6.84 (d, J= 6.5 Hz, 2 H), 6.78 (s, 2 H), 6.70 – 6.65 (m, 2 H), 4.54 (d, J= 1.0 Hz, 2 H), 3.54 – 3.46 (m, 2 H), 3.18 – 3.10 (m, 2 H), 2.98 – 2.86 (m, 2 H), 2.71 (br. s., 2 H), 1.25 – 1.22 (m, 18 H).

To a solution of Example B-1 Step e (0.04 g, 0.053 mmol) in DMF (5 mL) was added 4,4-difluorocyclohexanecarboxylic acid (0.017 g, 0.106 mmol), DIPEA (0.055 mL, 0.317 mmol) and HATU (0.030 g, 0.079 mmol). After being stirred for 2 h at room temperature, the volatile component was removed in vacuo and the residue was dissolved in DCM (10 mL), washed with saturated solution of NH₄C1, 10% NaHC0₃ solution, brine, dried over Na₂S0₄ and concentrated in vacuo. The crude was purified by reverse phase HPLC purification to give Example B-1 as a white solid. LC (Condition 1): R, = 2.37 min. LC/MS: Anal. Calcd. for [M+H]⁺

C₅₄H₆₃F₄N₆0₂: 903.49; found 903.4. 1H NMR (DMSO-d₆, δ = 2.50 ppm, 400 MHz): δ 12.53 – 12.32 (m, 2 H), 8.41 – 8.21 (m, 2 H), 7.84 – 7.50 (m, 4 H), 7.43 – 7.24 (m, 2 H), 6.90 – 6.67 (m, 4 H), 6.60 – 6.44 (m, 2 H), 5.14 – 4.97 (m, 2 H), 3.44 (br. s., 2 H), 3.08 (br. s., 2 H), 2.93 – 2.77 (m, 2 H), 2.73 – 2.56 (m, 4 H), 2.20 – 1.98 (m, 3 H), 1.96 – 1.49 (m, 13 H), 1.02 (s, 18 H).

Starting materials can be obtained from commercial sources or prepared by well-established literature methods known to those of ordinary skill in the art. Acid precursors for the final step can be prepared according to the methods described in U.S. Patent Application Serial No. 13/933495, filed July 2, 2013.

LC/MS Condition 1

Column = Ascentis Express C18, 2.1 X 50 mm, 2.7 um

Solvent A = CH₃CN (2%) + 10 mM NH₄COOH in H₂0 (98%)

Solvent B = CH₃CN (98%) + 10 mM NH₄COOH in H₂0 (2%)

Start %B = 0; Final %B = 100

Gradient time = 1.4 min; Stop time = 4 min

Stop time = 4 min

Flow Rate = 1 mL/min; Wavelength = 220 nm

LC/MS Condition 2

Column = Waters BEH CI 8, 2.0 x 50 mm, 1.7 μιη

Slovent A = ACN (5%) + H₂0 (95%) containing 10 mM NH₄OAc

Solvent B = ACN (95%) + H₂0 (5%) containing 10 mM NH₄OAc

Start %B = 0; Final %B = 100

Gradient time = 3 min

Flow Rate = 1 mL/min

Wavelength = 220 nm

Temperature = 50 °C

LC/MS Condition 3

Column: Waters Phenomenex CI 8, 2.0 x 30 mm, 3 μιη particle

Mobile Phase A: 10% MeOH:90% Water :0.1%TFA

Mobile Phase B: 90% MeOH: 10% Water :0.1%TFA

Gradient: 0%B, 0-100% B over 3 minutes, then a 1 -minute hold at 100% B Flow: 0.8mL/min

Detection: 220 nm

Temperature: 40 °C

LC/MS Condition 4

Column: Waters BEH CI 8, 2.0 x 50 mm, 1.7 μιη particle

Mobile Phase A: 5:95 acetonitrile: water with 10 mM ammonium acetate Mobile Phase B: 95:5 acetonitrile: water with 10 mM ammonium acetate Gradient: 0%B, 0-100% B over 3 minutes, then a 0.5-minute hold at 100% B Flow: 1 mL/min

Detection: UV at 220 nm

Temperature: 50 °C

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