4-[tert-butyl(diphenyl)silyl]oxybutanal

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: A mixture of the 4-(tert-butyldiphenylsilyloxy)butanal (235 mg, 0.72 mmol) in benzene (3 ml) was added dropwise to a solution of hydroxy ethylamine (44 μL, 0.72 mmol) in benzene (3 mL). Powdered molecular sieves (4 Å, 600 mg) were added and the mixture was stirred for 1.5 h, before being filtered through a 20 μm Millipore syringe filter and concentrated. This gave 12 which was used directly and immediately in the synthesis of 13 (infra): 1H NMR(C6D6); δ1.18 (s, 9H), 1.65-1.82 (m, 2H), 2.62 (m, 2H), 3.33 (dd, 3H, J=6.1, 7.5 Hz), 3.69 (t, 3H, J=6.1 Hz), 4.26 (t, 1H), 7.23 (dd, 6H, J=1.9, 3.1 Hz), 7.79 (m, 4H). Powdered molecular sieves (4 Å, 600 mg) were added before being filtered through a 20 μm Millipore syringe filter concentrated

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

Procedure: To a solution of the 4-(tert-butyldiphenylsilyloxy)butan-1-ol (0.5 g, 1.5 mmol) in dichloromethane (20 mL) was added Dess-Martin periodinane (775 mg, 1.83 mmol). The mixture was stirred for 1 h. The reaction mixture was poured into hexanes and the resulting white precipitant was removed via filtration. The solution was concentrated to give form a slurry, which was dissolved in dichloromethane (5 mL) and again poured into hexanes resulting in the precipitation of white solid. The solids were removed via filtration and the resulting solution was concentrated. This gave 475 mg (97%) of a clear oil: 1H NMR (CDCl3); δ1.04 (s, 9H), 1.89 (m, 2H), 2.55 (m, 2H), 3.69 (t, 2H, J=6.1 Hz)), 7.38 (m, 6H), 7.63 (d, 4H, J=1.7 Hz), 9.79 (t, 1H, J=1.8 Hz). the resulting white precipitant was removed via filtration The solution was concentrated to give form a slurry, which The solids were removed via filtration the resulting solution was concentrated

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

Procedure: To a solution of the 4-(tert-butyldiphenylsilyloxy)butan-1-ol (0.5 g, 1.5 mmol) in dichloromethane (20 mL) was added Dess-Martin periodinane (775 mg, 1.83 mmol). The mixture was stirred for 1 h. The reaction mixture was poured into hexanes and the resulting white precipitant was removed via filtration. The solution was concentrated to give form a slurry, which was dissolved in dichloromethane (5 mL) and again poured into hexanes resulting in the precipitation of white solid. The solids were removed via filtration and the resulting solution was concentrated. This gave 475 mg (97%) of a clear oil: 1H NMR (CDCl3); δ1.04 (s, 9H), 1.89 (m, 2H), 2.55 (m, 2H), 3.69 (t, 2H, J=6.1 Hz)), 7.38 (m, 6H), 7.63 (d, 4H, J=1.7 Hz), 9.79 (t, 1H, J=1.8 Hz). the resulting white precipitant was removed via filtration The solution was concentrated to give form a slurry, which The solids were removed via filtration the resulting solution was concentrated

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: A mixture of the 4-(tert-butyidiphenylsilyloxy)butanal (235 mg, 0.72 mmol) in benzene (3 ml) was added dropwise to a solution of hydroxy ethylamine (44 μL, 0.72 mmol) in benzene (3 mL). Powdered molecular sieves (4 Å, 600 mg) were added and the mixture was stirred for 1.5 h, before being filtered through a 20 μm Millipore syringe filter and concentrated. This gave 12 which was used directly and immediately in the synthesis of 13 (infra): 1H NMR (C6D6); δ1.18 (s, 9H), 1.65-1.82 (m, 2H), 2.62 (m, 2H), 3.33 (dd, 3H, J=6.1, 7.5 Hz), 3.69 (t, 3H, J=6.1 Hz), 4.26 (t, 1H), 7.23 (dd, 6H, J=1.9, 3.1 Hz), 7.79 (m, 4H). Powdered molecular sieves (4 Å, 600 mg) were added before being filtered through a 20 μm Millipore syringe filter concentrated

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

Procedure: To a solution of the 4-(tert-butyidiphenylsilyloxy)butan-1-ol (0.5 g, 1.5 mmol) in dichloromethane (20 mL) was added Dess-Martin periodinane (775 mg, 1.83 mmol). The mixture was stirred for 1 h. The reaction mixture was poured into hexanes and the resulting white precipitant was removed via filtration. The solution was concentrated to give form a slurry, which was dissolved in dichloromethane (5 mL) and again poured into hexanes resulting in the precipitation of white solid. The solids were removed via filtration and the resulting solution was concentrated. This gave 475 mg (97%) of a clear oil: 1H NMR (CDCl3); δ1.04 (s, 9H), 1.89 (m, 2H), 2.55 (m, 2H), 3.69 (t, 2H, J=6.1 Hz)), 7.38 (m, 6H), 7.63 (d, 4H, J=1.7 Hz), 9.79 (t, 1H, J=1.8 Hz). the resulting white precipitant was removed via filtration The solution was concentrated to give form a slurry, which The solids were removed via filtration the resulting solution was concentrated

Conditions: temp:63.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a suspension of Mg turnings (145 mg, 6.0 mg-at.) and catalytic amount of iodine in 20 mL THF was added dropwise 1-Bromo-4-chloro-benzene (382 mg, 2.0 mmol) with heating over a period of 30 min. After stirring for an additional 30 min at 63° C. the mixture was cooled to −30° C. and 4-(tert-Butyl-diphenyl-silanyloxy)-butyraldehyde (500 mg, 1.53 mmol) was added slowly as a solution in 5 mL THF. The temperature was maintained at −30° C. for 1 h and slowly raised to room temperature. The excess Grignard reagent was destroyed by careful addition of saturated aqueous NH4Cl (20 mL). The mixture was extracted with ethyl acetate (3×30 mL) and the combined organic layers washed with brine (2×20 mL). After removal of the solvent under reduced pressure the product was isolated by flash column chromatography eluting with 0 to 50% EtOAc/hexanes to afford 330 mg of the title compound as a light yellow oil. with heating over a period of 30 min was cooled to −30° C. The temperature was maintained at −30° C. for 1 h slowly raised to room temperature The excess Grignard reagent was destroyed by careful addition of saturated aqueous NH4Cl (20 mL) The mixture was extracted with ethyl acetate (3×30 mL) the combined organic layers washed with brine (2×20 mL) After removal of the solvent under reduced pressure the product was isolated by flash column chromatography eluting with 0 to 50% EtOAc/hexanes