tert-butyl N-(3-oxopropyl)carbamate

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:

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

Procedure: This was prepared using the same procedure as for 4-(6-bromo-2-(4-(dimethylamino)phenyl-3H-imidazo[4,5-b]pyridin-7-yl)-N-phenylpiperazine-1-carboxamide, but here using 5-bromo-3-nitro-4-(4-(pyridin-3-ylmethyl)piperazin-1-yl)pyridin-2-amine (64 mg, 0.16 mmol), DMF (0.15 mL), ethanol (0.85 mL), 1M Na2S2O4 (3 eq, 0.49 mmol, 0.49 mL) and tert-butyl 3-oxopropylcarbamate (prepared according to the procedure described in Tetrahedron 2003, 59, 1719) (1.1 eq, 0.18 mmol, 31 mg). After 6 h, concentration in vacuo and purification by preparative tlc (CH2Cl2-MeOH, 9:1) gave the product (31 mg, 37%) as a colourless solid; δH (500 MHz, DMSO-d6) 1.35 (s, 9H, C(CH3)3), 2.58 (s, br, 4H, piperazine N(CH2)2), 2.89 (t, J=5.5 Hz, 2H, CH2CH2NH), 3.30 (hidden by DMSO peak, 2H, CH2CH2NH), 3.57 (t, J=4.4 Hz, 4H, piperazine N(CH2)2), 3.59 (s, 2H, NCH2Ar), 6.92 (s, br, 1H, NH), 7.38 (dd, J=7.7, 4.8 Hz, 1H, pyridine H-5), 7.76 (dt, J=7.7, 1.5 Hz, 1H, pyridine H-4), 8.16 (s, 1H, imidazo[4,5-b]pyridine H-5), 8.48 (dd, J=4.8, 1.5 Hz, 1H, pyridine H-6), 8.54 (d, J=1.5 Hz, 1H, pyridine H-2), 12.79 (s, br, 1H, imidazo[4,5-b]pyridine NH); This was prepared prepared concentration in vacuo and purification by preparative tlc (CH2Cl2-MeOH, 9:1)

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

Procedure: To a stirring solution of 3-(Boc-amino)-1-propanol (25 mL, 0.144 mol) in water saturated DCM (1.0 L) was added Dess-Martin reagent (99.2 g, 233.9 mmol) and the reaction mixture was stirred for 1 hour. The reaction was then diluted with ether (1.0 L), followed by a solution of Na2S2O3 (250 g) in 80% NaHCO3 (450 g in 1.0 L H2O). The reaction was stirred vigorously for 30 minutes until two layers formed, the top layer was clear. The reaction was filtered to remove the precipitated solids and the aqueous layer was extracted with ether (1.0 L). The organic layer was washed with sat. NaHCO3 (1.0 L), H2O (1.0 L), and brine (1 L), dried over Na2SO4 and concentrated to a clear oil. The crude oil was dissolved in EtOAc: hexanes (1:1 v/v, 1.0 L) and filtered through a short silica gel column to yield the desired N-Boc-3-amino-propanal (21.7 g, 0.125 mol, 85.6% yield): 1H NMR (400 MHz, CDCl3) δ 9.77 (s, 1 H, CHO), 4.85 (bs, 1 H, NH), 3.36-3.42 (m, 2 H, CH2), 2.67 (t, 2 H, CH2), 1.39 (s, 9 H, (CH3)3). The reaction was stirred vigorously for 30 minutes until two layers formed The reaction was filtered to remove the precipitated solids the aqueous layer was extracted with ether (1.0 L) The organic layer was washed with sat. NaHCO3 (1.0 L), H2O (1.0 L), and brine (1 L) dried over Na2SO4 concentrated to a clear oil The crude oil was dissolved in EtOAc: hexanes (1:1 v/v, 1.0 L) filtered through a short silica gel column

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

Procedure: To a stirring solution of 3-(Boc-amino)-1-propanol (25 mL, 0.144 mol) in water saturated DCM (1.0 L) was added Dess-Martin reagent (99.2 g, 233.9 mmol) and the reaction mixture was stirred for 1 hour. The reaction was then diluted with ether (1.0 L), followed by a solution of Na2S2O3 (250 g) in 80% NaHCO3 (450 g in 1.0 L H2O). The reaction was stirred vigorously for 30 minutes until two layers formed, the top layer was clear. The reaction was filtered to remove the precipitated solids and the aqueous layer was extracted with ether (1.0 L). The organic layer was washed with sat. NaHCO3 (1.0 L), H2O (1.0 L), and brine (1 L), dried over Na2SO4 and concentrated to a clear oil. The crude oil was dissolved in EtOAc:hexanes (1:1 v/v, 1.0 L) and filtered through a short silica gel column to yield the desired N-Boc-3-amino-propanal (21.7 g, 0.125 mol, 85.6% yield): 1H NMR (400 MHz, CDCl3) δ 9.77 (s, 1 H, CHO), 4.85 (bs, 1 H, NH), 3.36-3.42 (m, 2 H, CH2), 2.67 (t, 2 H, CH2), 1.39 (s, 9 H, (CH3)3). The reaction was stirred vigorously for 30 minutes until two layers formed The reaction was filtered to remove the precipitated solids the aqueous layer was extracted with ether (1.0 L) The organic layer was washed with sat. NaHCO3 (1.0 L), H2O (1.0 L), and brine (1 L) dried over Na2SO4 concentrated to a clear oil The crude oil was dissolved in EtOAc:hexanes (1:1 v/v, 1.0 L) filtered through a short silica gel column

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

Procedure: To a stirring solution of 3-(Boc-amino)-1-propanol (25 mL, 0.144 mol) in water saturated DCM (1.0 L) was added Dess-Martin reagent (99.2 g, 233.9 mmol) and the reaction mixture was stirred for 1 hour. The reaction was then diluted with ether (1.0 L), followed by a solution of Na2S2O3 (250 g) in 80% NaHCO3 (450 g in 1.0 L H2O). The reaction was stirred vigorously for 30 minutes until two layers formed, the top layer was clear. The reaction was filtered to remove the precipitated solids and the aqueous layer was extracted with ether (1.0 L). The organic layer was washed with sat. NaHCO3 (1.0 L), H2O (1.0 L), and brine (1 L), dried over Na2SO4 and concentrated to a clear oil. The crude oil was dissolved in EtOAc:hexanes (1:1 v/v, 1.0 L) and filtered through a short silica gel column to yield the desired N-Boc-3-amino-propanal (21.7 g, 0.125 mol, 85.6% yield): 1H NMR (400 MHz, CDCl3) δ 9.77 (s, 1H, CHO), 4.85 (bs, 1H, NH), 3.36-3.42 (m, 2H, CH2), 2.67 (t, 2H, CH2), 1.39 (s, 9H, (CH3)3). The reaction was stirred vigorously for 30 minutes until two layers formed The reaction was filtered to remove the precipitated solids the aqueous layer was extracted with ether (1.0 L) The organic layer was washed with sat. NaHCO3 (1.0 L), H2O (1.0 L), and brine (1 L) dried over Na2SO4 concentrated to a clear oil The crude oil was dissolved in EtOAc:hexanes (1:1 v/v, 1.0 L) filtered through a short silica gel column

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

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