7-bromoheptanal

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

Procedure: To 8.5 g of 7-bromoheptanoic acid t-butyl ester (prepared as described in Reference Example 1) in 80 ml of methylene chloride was added dropwise 18.2 ml of a 25% solution of diisobutyl alminium hydride in toluene at -78° C. over a period of 1 hours. The solution was stirred at the same temperature, to which was added 5 ml of methanol at from 0° C. to 10° C. and then added 10 ml of water, and the mixture was stirred at 30° C. to 40° C. for 1 hour. The deposited crystals were filtered out, and the filtrate was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel using a mixture of methylene and chloride and cyclohexane (1:1) as an eluent to give 5.28 g of the title compound having the following physical characteristic: the mixture was stirred at 30° C. to 40° C. for 1 hour The deposited crystals were filtered out the filtrate was concentrated under reduced pressure The residue was purified by column chromatography on silica gel using a mixture of methylene and chloride and cyclohexane (1:1) as an eluent

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

Procedure: To 8.5 g of 7-bromoheptanoic acid t-butyl ester (prepared as described in Reference Example 1) in 80 ml of methylene chloride was added dropwise 18.2 ml of a 25% solution of diisobutyl alminium hydride in toluene at -78° C. over a period of 1 hours. The solution was stirred at the same temperature, to which was added 5 ml of methanol at from 0° C. to 10° C. and then added 10 ml of water, and the mixture was stirred at 30° C. to 40° C. for 1 hour. The deposited crystals were filtered out, and the filtrate was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel using a mixture of methylene and chloride and cyclohexane (1:1) as an eluent to give 5.28 g of the title compound having the following physical characteristic: the mixture was stirred at 30° C. to 40° C. for 1 hour The deposited crystals were filtered out the filtrate was concentrated under reduced pressure The residue was purified by column chromatography on silica gel using a mixture of methylene and chloride and cyclohexane (1:1) as an eluent

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

Procedure: To a solution of crude 7-bromoheptanal (Enders and Bartzen (1991) Liebigs Ann. Chem, 569-574) (3.32 g, 17.2 mmol) in acetone (50 mL) was added potassium thioacetate (2.36 g, 21 mmol) under stirring at rt. Then the mixture was refluxed, yielding a precipitate after a few minutes. The reaction was monitored by TLC and cooled to rt when no starting material was detectable (4 h). Water (50 mL) was added, the mixture was extracted with ethyl ether until the organic phase was colorless, and the combined organic phases were dried (Na2SO4) and evaporated. Distillation at 98° C. with a water suction pump afforded 1.66 g (51%, 42% from 7-bromoheptanol) of a yellow oil. IR (neat): {tilde over (v)} 2938, 2857, 2721, 1725, 1694; 1H NMR δ 1.28-1.43 (m, 4H), 1.53-1.69 (m, 4H), 2.33 (s, 3H), 2.43 (dt, 3J=7.3Hz, 3J=1.5Hz, 2H), 2.86 (t, 3J=7.3 Hz, 2H), 9.77 (t, 3J=1.5 Hz, 1H); 13C NMR (APT) δ 21.6 (+), 28.1 (+), 28.3 (+), 28.6 (+), 29.0 (+), 30.3 (−), 43.3 (+), 195.4 (+), 202.0 (−); GC-MS (EI) obsd 188, 187, 145, 128, 112, 94, 43. Then the mixture was refluxed yielding a precipitate after a few minutes cooled to rt when no starting material (4 h) the mixture was extracted with ethyl ether until the organic phase the combined organic phases were dried (Na2SO4) evaporated Distillation at 98° C. with a water suction pump

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

Procedure: To a solution of crude 7-bromoheptanal (Enders and Bartzen (1991) Liebigs Ann. Chem, 569–574) (3.32 g, 17.2 mmol) in acetone (50 mL) was added potassium thioacetate (2.36 g, 21 mmol) under stirring at rt. Then the mixture was refluxed, yielding a precipitate after a few minutes. The reaction was monitored by TLC and cooled to rt when no starting material was detectable (4 h). Water (50 mL) was added, the mixture was extracted with ethyl ether until the organic phase was colorless, and the combined organic phases were dried (Na2SO4) and evaporated. Distillation at 98° C. with a water suction pump afforded 1.66 g (51%, 42% from 7-bromoheptanol) of a yellow oil. IR (neat): {tilde over (v)} 2938, 2857, 2721, 1725, 1694; 1H NMR δ 1.28–1.43 (m, 4H), 1.53–1.69 (m, 4H), 2.33 (s, 3H), 2.43 (dt, 3J=7.3 Hz, 3J=1.5 Hz, 2H), 2.86 (t, 3J=7.3 Hz, 2H), 9.77 (t, 3J=1.5 Hz, 1H); 13C NMR (APT) δ 21.6 (+), 28.1 (+), 28.3 (+), 28.6 (+), 29.0 (+), 30.3 (−), 43.3 (+), 195.4 (+), 202.0 (−); GC-MS (EI) obsd 188, 187, 145, 128, 112, 94, 43. Then the mixture was refluxed yielding a precipitate after a few minutes cooled to rt when no starting material (4 h) the mixture was extracted with ethyl ether until the organic phase the combined organic phases were dried (Na2SO4) evaporated Distillation at 98° C. with a water suction pump

Conditions: temp:-55.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 8-bromo-1-octene (5.0 g, 0.026 mol) in 25 mL of MeOH and 5 mL of CH2Cl2 was cooled to -40° C. and treated with O3 while the mixture was cooled to -50 to -60° C. After 30 min the mixture turned bluish and after another 10 min of O3 treatment the mixture was purged with a stream of N2 for 5 min. With the mixture still at -50° C. and covered with a blanket of N2, 2.5 mL of dimethylsulfide was added. This mixture was stirred for 1 h at -40° C., 1 h at -20° C. and then allowed to warm to -10° C. over 1 h. A vacuum from the water aspiration was applied to remove some of the excess dimethylsulfide, and the residue concentrated further on a rotary evaporator (house vacuum). The residue was treated with 10 mL of water and this mixture was extracted with hexane; the organic extracts were washed with water, then brine, dried (MgSO4) and concentrated. A portion of the crude product (0.7 g) was chromatographed under pressure to give 7-bromoheptaldehyde: NMR (CDCl3) δ1.41 (m, 4H), 1.63 (m, 2H), 1.87 (m, 2H), 2.45 (m, 2H), 3.41 (m, 2H), 9.78 (s, 1H). the mixture was purged with a stream of N2 for 5 min still at -50° C. was added to warm to -10° C. over 1 h to remove some of the excess dimethylsulfide the residue concentrated further on a rotary evaporator (house vacuum) The residue was treated with 10 mL of water this mixture was extracted with hexane the organic extracts were washed with water brine, dried (MgSO4) concentrated A portion of the crude product (0.7 g) was chromatographed under pressure

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

Procedure: To 8.5 g of 7-bromoheptanoic acid t-butyl ester (prepared as described in Reference Example 1) in 80 ml of methylene chloride was added dropwise 18.2 ml of a 25% solution of diisobutyl alminium hydride in toluene at -78° C. over a period of 1 hours. The solution was stirred at the same temperature, to which was added 5 ml of methanol at from 0° C. to 10° C. and then added 10 ml of water, and the mixture was stirred at 30° C. to 40° C. for 1 hour. The deposited crystals were filtered out, and the filtrate was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel using a mixture of methylene and chloride and cyclohexane (1:1) as an eluent to give 5.28 g of the title compound having the following physical characteristic: the mixture was stirred at 30° C. to 40° C. for 1 hour The deposited crystals were filtered out the filtrate was concentrated under reduced pressure The residue was purified by column chromatography on silica gel using a mixture of methylene and chloride and cyclohexane (1:1) as an eluent