4-amino-2-(2,6-dioxopiperidin-3-yl)isoindole-1,3-dione

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:22.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 3-aminophthalic acid hydrochloride (200 g, 0.92 mol, from Prosynth Ltd., Suffolk, UK), 3-aminoglutarimide hydrochloride (159 g, 0.96 mol, from Evotec OAI, Hamburg, Germany), acetonitrile (2.0 L), and acetic acid (577 g, 9.6 mol, from Fisher Scientific) was charged into a reaction vessel. After the mixture was stirred for 15 minutes, triethylamine (465.0 g, 4.6 mol, from Aldrich, Milwaukee, Wis.) was added dropwise over 30-35 minutes while the reaction temperature was maintained at 20-25° C. Next, the reaction mixture was stirred further for 10-15 minutes and then refluxed at about 85 to 87° C. for about 5 to 7 hours or until the in-process control, i.e., HPLC AP at 240 nm, indicates that <2% of the 3-aminophthalic acid remained in the reaction mixture. After the reaction mixture was cooled to about 20 to 25° C. over 1-2 hours, 1.0 L of water was charged over 15-30 minutes at about 20 to 25° C. The resulting mixture was stirred at about 15 to 20° C. for about 20 to 30 minutes to provide a yellow solid precipitate, which was filtered, washed with DI water (3×1.0 L) and acetonitrile (2×500 mL), and then dried at about 35 to 40° C. in vacuo to a constant weight at 210.0 g (84%). was charged into a reaction vessel Next, the reaction mixture was stirred further for 10-15 minutes refluxed at about 85 to 87° C. for about 5 to 7 hours After the reaction mixture was cooled to about 20 to 25° C. over 1-2 hours The resulting mixture was stirred at about 15 to 20° C. for about 20 to 30 minutes to provide a yellow solid precipitate, which was filtered washed with DI water (3×1.0 L) and acetonitrile (2×500 mL) dried at about 35 to 40° C. in vacuo to a constant weight at 210.0 g (84%)

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

Procedure: A mixture of 4-amino-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione (1.1 g, 4.0 mmol) and 2-fluorobenzoyl chloride (1.0 mL, 8.4 mmol) in THF (40 mL) was heated to reflux for 15 h. To the mixture was added methanol, (10 mL) to give a suspension. The suspension was filtered and washed with methanol (20 mL) to give N-[2-(2,6-dioxo-piperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-4-yl]-2-fluoro-benzamide as a white solid (1.5 g, 93% yield): mp, 300-302° C.; 1H NMR (DMSO-d6) δ 2.05-2.12 (m, 1H, CHH), 2.45-2.65 (m, 2H, CH2), 2.83-2.97 (m, 1H, CHH), 5.18 (dd, J=5.5, 12.9 Hz, 1H, NCH), 7.40-7.49 (m, 2H, Ar), 7.67-7.76 (m, 2H, Ar), 7.88-7.98 (m, 1H, Ar), 8.01-8.05 (m, 1H, Ar), 8.76 (d, J=8.4 Hz, 1H Ar), 10.56 (d, JN-F=10 Hz, 1H, NH), 11.17 (s, 1H, NH); 13C NMR (DMSO-d6) δ 21.96, 30.92, 48.97, 116.48, 116.97 (d, JC-F=14 Hz), 118.82, 120.87 (d, JC-F=12 Hz), 125.32 (d, JC-F=1.5 Hz), 125.74, 131.32, 131.39, 134.88 (d, JC-F=9 Hz), 136.22, 136.48, 159.75 (d, JC-F=252 Hz), 161.76 (d, JC-F=7 Hz), 166.58, 168.04, 169.70, 172.71; Anal. Calcd for C20H14N3O5F: C, 60.76; H, 3.57; N, 10.63; F, 4.81. Found: C, 60.70; H, 3.64; N, 10.64; F. 4.91. was heated to reflux for 15 h to give a suspension The suspension was filtered washed with methanol (20 mL)

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

Procedure: A mixture of 4-amino-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione (660 mg, 2.4 mmol) and 2-methoxybenzoyl chloride (0.7 mL, 4.7 mmol) in THF (20 mL) was heated to reflux for 15 h. To the mixture was added methanol (5 mL) to give a suspension. The suspension was filtered and washed with methanol (20 mL) to give N-[2-(2,6-dioxo-piperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-4-yl]-2-methoxy-benzamide as a white solid (760 mg, 78% yield): mp, 286-287° C.; 1H NMR (DMSO-d6) (at 340K) δ 2.09-2.14 (m, 1H, CHH), 2.55-2.66 (m, 2H, CH2), 2.85-2.98 (m, 1H, CHH). 4.14 (s, 3H, OCH3), 5.19 (dd, J=5.5, 12.9 Hz, 1H, NCH), 7.17 (t, J=7.2 Hz, 1H, Ar), 7.30 (d, J=8.3 Hz, 1H, Ar), 7.61-7.68 (m, 2H, Ar), 7.89 (t, J=. 7.7 Hz, 1H, Ar), 8.12 (dd, J=1.8, 7.9 Hz, 1H Ar), 9.03 (d, J=8.5 Hz, 1H, Ar), 11.17 (s, 1H, NH), 11.64 (s, 1H, NH); 13C NMR (DMSO-d6) (at 340K) δ 22.09, 31.02, 49.29, 56.19, 112.65, 116.31, 117,93, 120.66, 121.14, 125.52, 131.59, 131.75, 134.34, 136.22, 137.00, 157.64, 163.82, 166.69, 168.15, 169.43, 172.32; Anal Calcd for C21H17N3O6: C, 61.92; H, 4.21; N, 10.31. Found: C, 62.05; H, 4.10; N, 10.38. was heated to reflux for 15 h to give a suspension The suspension was filtered washed with methanol (20 mL)

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

Procedure: To a solution of (methylthio)acetic acid (0.77 mL, 8.9 mmol) and oxalyl chloride (0.7 mL, 8.0 mmol) in ether (5 mL) was added DMF (0.02 mL) at room temperature. After 3 h, 4-amino-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione (1.1 g, 4.0 mmol) and THF (40 mL) was added to the mixture. Then the mixture was heated to reflux for 15 h. To the mixture was added methanol (10 mL) to give a suspension. The suspension was filtered and washed with methanol (10 mL) to give N-[2-(2,6-dioxo-piperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-4-yl]-2-methylsulfanyl-acetamide as a white solid (1.0 g, 69% yield): mp, 228-230° C.; 1H NMR (DMSO-d6) δ 2.05-2.10 (m, 1H, CHH), 2.18 (s, 3H, CH3), 2.46-2.65 (m, 2H, CH2), 2.82-2.95 (m, 1H, CHH), 3.53 (s, 2H, CH2), 5.17 (dd, J=5.2, 12.6 Hz, 1H, NCH), 7.63 (d, J=7.2 Hz, 1H, Ar), 7.86 (t, J=7.5 Hz, 1H, Ar), 8.61 (d, J=8.4 Hz, 1H, Ar), 10.39 (s, 1H, NH), 11.16 (s, 1H, NH); 13C NMR (DMSO-d6) δ 15.62, 21.96, 30.93, 37.99, 48.94, 116.69, 118.46, 125.28, 131.44, 136.31, 166.67, 167.88, 168.63, 169.78, 172.75; Anal Calcd for C16H15N3O5S: C, 53.18; H, 4.18; N, 11.63. Found: C, 53.26; H, 4.17; N, 11.52. Then the mixture was heated to reflux for 15 h to give a suspension The suspension was filtered washed with methanol (10 mL)

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

Procedure: To a solution of ethoxyacetic acid (0.8 mL, 8.5 mmol) and oxalyl chloride (0.7 mL, 8.0 mmol) in ether (5 mL) was added DMF (0.03 mL) at room temperature. After 3 h, 4-amino-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione (1.1 g, 4.0 mmol) and THF (40 mL) was added to the mixture. Then the mixture was heated to reflux for 15 h. To the mixture was added methanol (10 mL) to give a suspension. The suspension was filtered and washed with methanol (10 mL) to give N-[2-(2,6-dioxo-piperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-4-yl]-2-ethoxy-acetamide as a white solid (1.3 g, 87% yield): mp, 253-255° C.; 1H NMR (DMSO-d6) δ 1.27 (t, J=7.0 Hz, 3H, CH3), 2.06-2.10 (m, 1H, CHH), 2.46-2.64 (m, 2H, CH2), 2.84-2.98 (m, 1H, CHH), 3.66 (q, J=7.0 Hz, 2H, CH2), 4.14 (s, 2H, CH2), 5.17 (dd, J=5.2, 12.7 Hz, 1H, NCH), 7.62 (d, J=7.2 Hz, 1H, Ar), 7.87 (t, J=8.2 Hz, 1H, Ar), 8.75 (d, J=8.4 Hz, 1H, Ar), 10.39 (s, 1H, NH), 11.16 (s, 1H, NH); 13C NMR (DMSO-d6) δ 14.88, 21.93, 30.92, 48.98, 66.89, 69.49, 116.00, 118.28, 124.25, 131.31, 135.99, 136.53, 166.69, 168.31, 169.49, 169.73, 174.71; Anal Calcd for C17H17N3O6: C, 56.82; H, 4.77; N, 11.69. Found: C, 56.82; H, 4.71; N, 11.60. Then the mixture was heated to reflux for 15 h to give a suspension The suspension was filtered washed with methanol (10 mL)

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

Procedure: A mixture of 4-amino-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione (2.2 g, 8.0 mmol) and 4-nitrobenzoyl chloride (3.0 g, 16.0 mmol) in THF (80 mL) was heated to reflux for 15 h. To the mixture was added methanol (20 mL) to give a suspension. The suspension was filtered and washed with methanol (20 mL) to give N-[2-(2,6-Dioxo-piperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-4-yl]-4-nitro-benzamide as a white solid (2.5 g, 73% yield): mp, 298-300° C.; 1H NMR (DMSO-d6) δ 2.06-2.10 (m, 1H, CHH), 2.49-2.65 (m, 2H, CH2), 2.83-2.98 (m, 1H, CHH), 5.18 (dd, J=5.2, 12.6 Hz, 1H, NCH), 7.73 (d, J=7.2 Hz, 1H, Ar), 7.93 (t, J=8.0 Hz, 1H, Ar), 8.19-8.22 (m, 2H, Ar), 8.42-8.47 (m, 3H, Ar), 10.65 (s, 1H, NH), 11.18 (s, 1H, NH); 13C NMR (DMSO-d6) δ 21.99, 30.92, 48.99, 119.30, 119.56, 124.06, 127.49, 129.01, 131,58, 135.77, 136.23, 138.96, 149.69, 163.65, 166.57, 167.48, 169.68, 172.72; Anal Calcd for C21H14N4O7: C, 56.88; H, 3.34; N, 13.27. Found: C, 57.15; H, 3.02; N, 13.22. was heated to reflux for 15 h to give a suspension The suspension was filtered washed with methanol (20 mL)

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

Procedure: A mixture of 4-amino-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione (1.1 g, 4.0 mmol) and 4-methylbenzoyl chloride (1.1 g, 8.0 mmol) in THF (40 mL): was heated to reflux for 36 h. To the mixture was added methanol (5 mL) to give a suspension. The suspension was filtered and washed with methanol (15 mL) to give N-[2-(2,6-dioxo-piperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-4-yl]-4-methyl-benzamide as a yellow solid (1.3 g, 83% yield): mp, 322-324° C.; 1H NMR (DMSO-d6) δ 2.06-2.10 (m, 1H, CHH), 2.41 (s, 3H, CH3), 2.50-2.65 (it, 2H, CH2), 2.83-2.97 (m, 1H, CHH), 5.19 (dd, J=5.3, 12.6 Hz, 1H, NCH), 7.42 (d, J=8.1 Hz, 2H, Ar), 7.67 (d, J=7.2 Hz, 1H, Ar), 7.86-7.93 (m, 3H, Ar), 8.62 (d, J=8.4 Hz, 1H, Ar), 10.37 (s, 1H, NH), 11.18 (s, 1H, NH); 13C NMR (DMSO-d6) δ 21.07, 21.99, 30.93, 48.99, 117.57, 118.58, 125.94, 127.28, 129.58, 130.44, 131.33, 136.34, 136.77, 142.96, 164.80, 166.65, 168.29, 169.69, 172.72; Anal Calcd for C21H17N3O5: C, 64.45; H, 4.38; N, 10.74. Found: C, 64.65; H, 4.17; N, 10.70. was heated to reflux for 36 h to give a suspension The suspension was filtered washed with methanol (15 mL)