Potassium Carbonate → (1-{7-[5-(4'-{2-[6-(2-Methoxycarbonylamino-3-methyl-butyryl)-5-oxa-6-aza-spiro[3.4]oct-7-yl]-3H-imidazol-4-yl}-biphenyl-4-yl)-1H-imidazol-2-yl]-5-oxa-6-aza-spiro[3.4]octane-6-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of [2-methyl-1-(7-{5-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-1H-imidazol-2-yl}-5-oxa-6-azaspiro[3.4]octane-6-carbonyl)-propyl]-carbamic acid methyl ester (81 mg, 0.15 mmol), (1-{7-[5-(4-bromophenyl)-1H-imidazol-2-yl]-5-oxa-6-aza-spiro[3.4]octane-6-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (60 mg, 0.12 mmol) and tetrakis(triphenylphosphine)palladium(0) (14 mg, 0.012 mmol) in 1,2-dimethoxyethane (2.0 mL) was added a solution of potassium carbonate (2M in water, 0.250 mL, 0.50 mmol). The resulting mixture was degassed for 15 minutes with a stream of argon and then heated to 85° C. for 3 hours. After cooling to room temperature, the reaction was filtered through a palladium scavenging column (STRATOSPHERES™ PL-Guanidine MP SPE+, Part #: PL3514-CM89) and the solids were rinsed with methanol. The filtrate was concentrated and purified by preparative reverse phase HPLC (Gemini, 15 to 51% ACN/H2O+0.1% HCO2H) to yield (1-{7-[5-(4′-{2-[6-(2-Methoxycarbonylamino-3-methyl-butyryl)-5-oxa-6-aza-spiro[3.4]oct-7-yl]-3H-imidazol-4-yl}-biphenyl-4-yl)-1H-imidazol-2-yl]-5-oxa-6-aza-spiro[3.4]octane-6-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (26 mg, 26%). LCMS-ESI+: calculated for C44H54N8O8: 822.41; observed [M+1]+: 823.43. 1H-NMR: 400 MHz, (CD3OD) δ: 7.78-7.75 (m, 4H), 7.68-7.65 (m, 4H), 7.38 (s, 2H), 6.94-6.89 (br, 2H), 5.47-5.42 (m, 2H), 4.74-4.68 (br, 2H), 3.66 (s, 6H), 3.00-2.94 (m, 2H), 2.78-2.71 (m, 2H), 2.61-2.53 (m, 2H), 2.49-2.40 (m, 2H), 2.38-2.30 (m, 2H), 2.22-2.09 (m, 4H), 2.00-1.90 (m, 2H), 1.84-1.75 (m, 2H), 0.98 (d, J=6.8 Hz, 6H), 0.88 (d, J=6.7 Hz, 6H) ppm.

Provenance & Evidence