3-bromo-5-fluorobenzaldehyde

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: To a solution of 3,5-dibromofluorobenzene in diethyl ether (100 cm3) at −78° C. was added n-butyl lithium (2.5 M, 8 cm3, 20 mmol) dropwise. After 30 min. the mixture was treated with DMF (20 cm3) in diethyl ether (10 cm3) and stirring was continued at −78° C. After 30 min. the mixture was quenched with dilute HCl aq., separated and the aqueous layer was extracted with EtOAc. The combined organic layers were combined, washed with water, brine, dried (MgSO4) and evaporated to give 3-fluoro-5-bromobenzaldehyde (4.0 g, 19.7 mmol, 100%) as an oil: 1H NMR (CDCl3) δinter alia 7.50-7.53 (m, 2H), 7.82 (s, 1H) and 9.93 (m, 1H); MS (EI) m/z 202, 204 [M+]. was continued at −78° C After 30 min. the mixture was quenched with dilute HCl aq. separated the aqueous layer was extracted with EtOAc washed with water, brine dried (MgSO4) evaporated

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

Procedure: A solution of 3-bromo-5-fluorobenzaldehyde (CI) (2.12 g, 10.42 mmol) in MeOH (200 mL) was added 1-methylpiperazine (2.3 mL, 20.84 mL). The pH was adjusted to 6 using HOAc and stirred for 1 h. NaCNBH3 (917 mg, 14.59 mmol) was added and stirred at room temperature overnight. The MeOH was removed under vacuum and the residue was partitioned between CHCl3 and saturated aqueous NaHCO3. The organic layer was dried over MgSO4 and evaporated under vacuum. The crude product was purified on a silica gel column (100% CHCl3→3:97 MeOH[7N NH3]:CHCl3) to produce 1-(3-bromo-5-fluorobenzyl)-4-methylpiperazine (CII) as a yellow oil (1.52 g, 5.29 mmol, 51% yield). 1H NMR (DMSO-d6, 500 MHz) δ ppm 2.14 (s, 3H), 2.28-2.40 (m, 8H), 3.46 (s, 2H), 7.15-7.17 (m, 1H), 7.35 (s, 1H), 7.40-7.42 (m, 1H); ESIMS found C12H16BrFN2 m/z 287 (M+H). stirred at room temperature overnight The MeOH was removed under vacuum the residue was partitioned between CHCl3 and saturated aqueous NaHCO3 The organic layer was dried over MgSO4 evaporated under vacuum The crude product was purified on a silica gel column (100% CHCl3→3:97 MeOH[7N NH3]:CHCl3)

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

Procedure: Preparation of 3-bromo-5-fluorobenzaldehyde (XLIX) (2.03 g, 10.0 mmol) in DCE (50 mL) was added methanesulfonamide (1.43 g, 15.0 mmol) and TEA (2.79 mL, 20.0 mmol). The solution was stirred for a few minutes before NaBH(OAc)3 (3.00 g, 14.1 mmol) was added. The reaction was stirred at room temperature overnight. The solvent was removed under vacuum and the residue was partitioned between EtOAc and water. The organic layer was separated, dried over MgSO4 and evaporated under vacuum to give N-(3-bromo-5-fluorobenzyl)methanesulfonamide (L) as a clear oil (2.65 g, 9.39 mmol, 99% yield). ESIMS found C8H9BrFNO2S m/z 282 (M+H). was added The solvent was removed under vacuum the residue was partitioned between EtOAc and water The organic layer was separated dried over MgSO4 evaporated under vacuum

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

Procedure: To a solution of 3,5-dibromofluorobenzene in diethyl ether (100 cm3) at −78° C. was added n-butyl lithium (2.5 M, 8 cm3, 20 mmol) dropwise. After 30 min. the mixture was treated with DMF (20 cm3) in diethyl ether (10 cm3) and stirring was continued at −78° C. After 30 min. the mixture was quenched with dilute HCl aq., separated and the aqueous layer was extracted with EtOAc. The combined organic layers were combined, washed with water, brine, dried (MgSO4) and evaporated to give 3-fluoro-5-bromobenzaldehyde (4.0 g, 19.7 mmol, 100%) as an oil: 1H NMR (CDCl3) δ inter alia 7.50-7.53 (m, 2H), 7.82 (s, 1H) and 9.93 (m, 1H); MS (EI) m/z 202, 204 [M+]. was continued at −78° C After 30 min. the mixture was quenched with dilute HCl aq. separated the aqueous layer was extracted with EtOAc washed with water, brine dried (MgSO4) evaporated

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

Procedure: To a solution of 3,5-dibromofluorobenzene in diethyl ether (100 cm3) at −78° C. was added n-butyl lithium (2.5 M, 8 cm3, 20 mmol) dropwise. After 30 min. the mixture was treated with DMF (20 cm3) in diethyl ether (10 cm3) and stirring was continued at −78° C. After 30 min. the mixture was quenched with dilute HCl aq., separated and the aqueous layer was extracted with EtOAc. The combined organic layers were combined, washed with water, brine, dried (MgSO4) and evaporated to give 3-fluoro-5-bromobenzaldehyde (4.0 g, 19.7 mmol, 100%) as an oil: 1H NMR (CDCl3) δ inter alia 7.50-7.53 (m, 2H), 7.82 (s, 1H) and 9.93 (m, 1H); MS (EI) m/z 202, 204 [M+]. was continued at −78° C After 30 min. the mixture was quenched with dilute HCl aq. separated the aqueous layer was extracted with EtOAc washed with water, brine dried (MgSO4) evaporated

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

Procedure: Alkylation of 3-bromo-5-fluorobenzaldehyde with acetonitrile following the method used in Example 50 except KOBu-t was used instead of LDA gave 3-(3-bromo-5-fluorophenyl)-3-hydroxypropanenitrile as a light color oil. Yield (2.5 g, 86%): 1H NMR (400 MHz, CDCl3) δ 7.34 (bs, 1H), 7.21-7.24 (m, 1H), 7.08-7.11 (m, 1H), 5.02 (t, J=6.4 Hz, 1H), 2.75 (d, J=6.4 Hz, 2H).

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

Procedure: Alkylation of 3-bromo-5-fluorobenzaldehyde with acetonitrile following the method used in Example 50 except KOBu-t was used instead of LDA gave 3-(3-bromo-5-fluorophenyl)-3-hydroxypropanenitrile as a light color oil. Yield (2.5 g, 86%): 1H NMR (400 MHz, CDCl3) δ 7.34 (bs, 1H), 7.21-7.24 (m, 1H), 7.08-7.11 (m, 1H), 5.02 (t, J=6.4 Hz, 1H), 2.75 (d, J=6.4 Hz, 2H).