4-Benzyloxy-2,3-difluorobenzeneboronic acid

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The reaction of 6 mmol of 5-bromo-2-(6-dodecyloxypyridin-3-yl)pyrimidine, 6 mmol of 4-benzyloxy-2,3-difluorophenylboronic acid, 12 mmol of sodium carbonate 0.06 mmol of bis(dibenzylideneacetone)palladium(0) and 0.12 mmol of triphenylphosphine in 50 ml of toluene, 25 ml of ethanol and 25 ml of water is carried out analogously to the procedure indicated for Example 1a). Corresponding chromatographic purification gives 1.4 g (42%) of a colorless solid, m.p. 115° C., cl.p. 172° C. purification

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A reaction of 14 mmol of 2,5-dibromopyrimidine, 17 mmol of 4-benzyloxy-2,3-difluorophenylboronic acid, 34 mmol of sodium carbonate and 0.14 mmol of tetrakis(triphenylphosphine)palladium(0) in 100 ml of toluene, 50 ml of ethanol and 50 ml of water is carried out analogously to the procedure indicated for precursor 3. Purification by recrystallization from 2-propanol gives 1.4 g (26%) of a colorless solid, m.p. 138° C. Purification by recrystallization from 2-propanol

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Nitrogen was bubbled through a stirred solution of (4-(benzyloxy)-2,3-difluorophenyl)boronic acid (356 mg, 1.349 mmol) and tert-butyl 2-(5-bromo-1,3,4-thiadiazol-2-yl)-2,7-diazaspiro[3.5]nonane-7-carboxylate (343 mg, 0.881 mmol) in dioxane (8 mL). To this solution was added Pd(PPh3)4 (52 mg, 0.045 mmol) followed by a solution of Na2CO3 (286 mg, 2.7 mmol) in water (2 mL). The reaction mixture was sealed and heated at 100° C. for 1 hour under microwave irradiation. The reaction mixture was diluted with EtOAc (150 mL) and washed with water (75 mL). The organic phase was separated, dried over MgSO4, and filtered. The filtrate was concentrated in vacuo to afford the crude product as a light orange/brown solid. The crude material was pre-absorbed onto silica gel and purified by flash chromatography using a 40 g silica cartridge running an EtOAc/heptane gradient to afford the title compound as a white solid (169 mg, 35% yield). LC-MS: Rt 1.62 min; MS m/z 529.4 [M+H]+ [Method A]. 1H NMR (400 MHz, DMSO-d6) δ 7.75-7.82 (m, 1H), 7.46-7.51 (m, 2H), 7.36-7.45 (m, 3H), 7.24-7.32 (m, 1H), 5.30 (s, 2H), 3.89 (s, 4H), 3.24-3.31 (m, 4H), 1.66-1.78 (m, 4H), 1.40 (s, 9H). The reaction mixture was sealed washed with water (75 mL) The organic phase was separated dried over MgSO4 filtered The filtrate was concentrated in vacuo to afford the crude product as a light orange/brown solid The crude material was pre-absorbed onto silica gel purified by flash chromatography

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The reaction of 6 mmol of 5-bromo-2-(6-dodecyloxypyridin-3-yl)pyrimidine, 6 mmol of 4-benzyloxy-2,3-difluorophenylboronic acid, 12 mmol of sodium carbonate 0.06 mmol of bis(dibenzylideneacetone)palladium(0) and 0.12 mmol of triphenylphosphine in 50 ml of toluene, 25 ml of ethanol and 25 ml of water is carried out analogously to the procedure indicated for Example 1a). Corresponding chromatographic purification gives 1.4 g (42%) of a colorless solid, m.p. 115° C., cl.p. 172° C. purification

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A reaction of 14 mmol of 2,5-dibromopyrimidine, 17 mmol of 4-benzyloxy-2,3-difluorophenylboronic acid, 34 mmol of sodium carbonate and 0.14 mmol of tetrakis(triphenylphosphine)palladium(0) in 100 ml of toluene, 50 ml of ethanol and 50 ml of water is carried out analogously to the procedure indicated for precursor 3. Purification by recrystallization from 2-propanol gives 1.4 g (26%) of a colorless solid, m.p. 138° C. Purification by recrystallization from 2-propanol

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A reaction of 14 mmol of 2,5-dibromopyrimidine, 17 mmol of 4-benzyloxy-2,3-difluorophenylboronic acid, 34 mmol of sodium carbonate and 0.14 mmol of tetrakis(triphenylphosphine)palladium(0) in 100 ml of toluene, 50 ml of ethanol and 50 ml of water is carried out analogously to the procedure indicated for precursor 3. Purification by recrystallization from 2-propanol gives 1.4 g (26%) of a colorless solid, m.p. 138° C. Purification by recrystallization from 2-propanol

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Nitrogen was bubbled through a stirred solution of (4-(benzyloxy)-2,3-difluorophenyl)boronic acid (356 mg, 1.349 mmol) and tert-butyl 2-(5-bromo-1,3,4-thiadiazol-2-yl)-2,7-diazaspiro[3.5]nonane-7-carboxylate (343 mg, 0.881 mmol) in dioxane (8 mL). To this solution was added Pd(PPh3)4 (52 mg, 0.045 mmol) followed by a solution of Na2CO3 (286 mg, 2.7 mmol) in water (2 mL). The reaction mixture was sealed and heated at 100° C. for 1 hour under microwave irradiation. The reaction mixture was diluted with EtOAc (150 mL) and washed with water (75 mL). The organic phase was separated, dried over MgSO4, and filtered. The filtrate was concentrated in vacuo to afford the crude product as a light orange/brown solid. The crude material was pre-absorbed onto silica gel and purified by flash chromatography using a 40 g silica cartridge running an EtOAc/heptane gradient to afford the title compound as a white solid (169 mg, 35% yield). LC-MS: Rt 1.62 min; MS m/z 529.4 [M+H]+ [Method A]. 1H NMR (400 MHz, DMSO-d6) δ 7.75-7.82 (m, 1H), 7.46-7.51 (m, 2H), 7.36-7.45 (m, 3H), 7.24-7.32 (m, 1H), 5.30 (s, 2H), 3.89 (s, 4H), 3.24-3.31 (m, 4H), 1.66-1.78 (m, 4H), 1.40 (s, 9H). The reaction mixture was sealed washed with water (75 mL) The organic phase was separated dried over MgSO4 filtered The filtrate was concentrated in vacuo to afford the crude product as a light orange/brown solid The crude material was pre-absorbed onto silica gel purified by flash chromatography

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The reaction of 6 mmol of 5-bromo-2-(6-dodecyloxypyridin-3-yl)pyrimidine, 6 mmol of 4-benzyloxy-2,3-difluorophenylboronic acid, 12 mmol of sodium carbonate 0.06 mmol of bis(dibenzylideneacetone)palladium(0) and 0.12 mmol of triphenylphosphine in 50 ml of toluene, 25 ml of ethanol and 25 ml of water is carried out analogously to the procedure indicated for Example 1a). Corresponding chromatographic purification gives 1.4 g (42%) of a colorless solid, m.p. 115° C., cl.p. 172° C. purification

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A reaction of 14 mmol of 2,5-dibromopyrimidine, 17 mmol of 4-benzyloxy-2,3-difluorophenylboronic acid, 34 mmol of sodium carbonate and 0.14 mmol of tetrakis(triphenylphosphine)palladium(0) in 100 ml of toluene, 50 ml of ethanol and 50 ml of water is carried out analogously to the procedure indicated for precursor 3. Purification by recrystallization from 2-propanol gives 1.4 g (26%) of a colorless solid, m.p. 138° C. Purification by recrystallization from 2-propanol