1,4-dibromopentane

Conditions: temp:15.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A one liter, four necked round bottom flask equipped with a mechanical stirrer, thermowatch and condenser was charged with acetone (500 ml), potassium phthalimide (92.5 g, 0.5 moles) and 1,4-dibromopentane (153 g, 0.665 moles). The resulting mixture was refluxed for 24 hours (HPLC showed 2.5% unreacted phthalimide), then cooled to 15° C. Solid sodium bromide was removed by suction filtration and one wash of the cake with acetone (50 ml). The solvent was removed using a rotary evaporator to give 187.2 g of a crude viscous yellow oil. Excess 1,4-dibromopentane (34.5 g) was removed by vacuum distillation at 35-40° C./0.3 mm of pressure, leaving 144.6 g (97.7%) of a yellow viscous oil. A one liter, four necked round bottom flask equipped with a mechanical stirrer Solid sodium bromide was removed by suction filtration and one wash of the cake with acetone (50 ml) The solvent was removed a rotary evaporator to give 187.2 g of a crude viscous yellow oil Excess 1,4-dibromopentane (34.5 g) was removed by vacuum distillation at 35-40° C./0.3 mm of pressure

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

Procedure: The title compound, MS: m/e=453.2 [(M+H)+], was prepared in accordance with the general method of example 10 from cis-N-(2-amino-cyclohexyl)-2-methoxy-4,6-bis-trifluoromethyl-benzamide (intermediate H) and 1,4-dibromopentane. The two diastereomers were not separated.

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

Procedure: A mixture of (S)-2-aminopropan-1-ol (12.5 g, 0.166 mol), 1,4-dibromopentane (42 g, 0.18 mol) and Na2CO3 (53 g, 0.51 mol) in EtOH (800 mL) was heated at 100° C. for 24 h. The mixture was filtered, and the filter cake was washed with EtOH (50 mL). The combined filtrate was concentrated under reduced pressure, and the crude product was purified on a silica gel column (NH4OH/MeOH/DCM=1/6/300) to give (S)-2-((S)-2-methylpyrrolidin-1-yl)propan-1-ol (2.1 g) as a colorless oil and a crude mixture containing (S)-2-(R)-2-methylpyrrolidin-1-yl)propan-1-ol. 1H NMR (DMSO-d6): δ 4.22 (br s, 1H), 3.36 (dd, 1H), 3.22 (dd, 1H), 2.82 (m, 1H), 2.65 (m, 2H), 2.42 (q, 1H), 1.78 (m, 1H), 1.60 (m, 2H), 1.25 (m, 1H), 0.95 (d, 3H), 0.84 (d, 3H); LCMS: 144 (M+H)+. The mixture was filtered the filter cake was washed with EtOH (50 mL) The combined filtrate was concentrated under reduced pressure the crude product was purified on a silica gel column (NH4OH/MeOH/DCM=1/6/300)

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

Procedure: The title compound, MS: m/e=453.2 [(M+H)+], was prepared in accordance with the general method of example 10 from cis-N-(2-amino-cyclohexyl)-2-methoxy-4,6-bis-trifluoromethyl-benzamide (intermediate H) and 1,4-dibromopentane. The two diastereomers were not separated.

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

Procedure: In analogy to example 1.4, reaction of (4-Hydroxy-phenyl)-methyl-carbamic acid tert-butyl ester with 1,4-dibromopentane yielded [4-(5-Bromo-pentyloxy)-phenyl]-methyl-carbamic acid tert-butyl ester, MS: 372 (MH+, 1Br).

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

Procedure: A mixture of (S)-2-aminopropan-1-ol (12.5 g, 0.166 mol), 1,4-dibromopentane (42 g, 0.18 mol) and Na2CO3 (53 g, 0.51 mol) in EtOH (800 mL) was heated at 100° C. for 24 h. The mixture was filtered, and the filter cake was washed with EtOH (50 mL). The combined filtrate was concentrated under reduced pressure, and the crude product was purified on a silica gel column (NH4OH/MeOH/DCM=1/6/300) to give (S)-2-((S)-2-methylpyrrolidin-1-yl)propan-1-ol (2.1 g) as a colorless oil and a crude mixture containing (S)-2-((R)-2-methylpyrrolidin-1-yl)propan-1-ol. 1H NMR (DMSO-d6): δ 4.22 (br s, 1H), 3.36 (dd, 1H), 3.22 (dd, 1H), 2.82 (m, 1H), 2.65 (m, 2H), 2.42 (q, 1H), 1.78 (m, 1H), 1.60 (m, 2H), 1.25 (m, 1H), 0.95 (d, 3H), 0.84 (d, 3H); LCMS: 144 (M+H)+. The mixture was filtered the filter cake was washed with EtOH (50 mL) The combined filtrate was concentrated under reduced pressure the crude product was purified on a silica gel column (NH4OH/MeOH/DCM=1/6/300)

Conditions: temp:15.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A one liter, four necked round bottom flask equipped with a mechanical stirrer, thermowatch and condenser was charged with acetone (500 ml), potassium phthalimide (92.5 g, 0.5 moles) and 1,4-dibromopentane (153 g, 0.665 moles). The resulting mixture was refluxed for 24 hours (HPLC showed 2.5% unreacted phthalimide), then cooled to 15° C. Solid sodium bromide was removed by suction filtration and one wash of the cake with acetone (50 ml). The solvent was removed using a rotary evaporator to give 187.2 g of a crude viscous yellow oil. Excess 1,4-dibromopentane (34.5 g) was removed by vacuum distillation at 35-40° C./0.3 mm of pressure, leaving 144.6 g (97.7%) of a yellow viscous oil. A one liter, four necked round bottom flask equipped with a mechanical stirrer Solid sodium bromide was removed by suction filtration and one wash of the cake with acetone (50 ml) The solvent was removed a rotary evaporator to give 187.2 g of a crude viscous yellow oil Excess 1,4-dibromopentane (34.5 g) was removed by vacuum distillation at 35-40° C./0.3 mm of pressure

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

Procedure: The title compound, MS: m/e=453.2 [(M+H)+], was prepared in accordance with the general method of example 10 from cis-N-(2-amino-cyclohexyl)-2-methoxy-4,6-bis-trifluoromethyl-benzamide (intermediate H) and 1,4-dibromopentane. The two diastereomers were not separated.