Water → 6-ethoxy-pyridazine-3-carboxylic acid [2-(2,6-dioxo-piperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-5-ylmethyl]-amide

HRID 331605Notes

Reaction equation

HRID 331605 reaction equation
[CH2:1]([O:3][C:4]1[N:9]=[N:8][C:7]([C:10]([OH:12])=O)=[CH:6][CH:5]=1)[CH3:2].C1N=CN(C(N2C=NC=C2)=O)C=1.CS(O)(=O)=O.[NH2:30][CH2:31][C:32]1[CH:33]=[C:34]2[C:38](=[CH:39][CH:40]=1)[C:37](=[O:41])[N:36]([CH:42]1[CH2:47][CH2:46][C:45](=[O:48])[NH:44][C:43]1=[O:49])[C:35]2=[O:50].O>CN(C)C=O>[O:49]=[C:43]1[CH:42]([N:36]2[C:35](=[O:50])[C:34]3[C:38](=[CH:39][CH:40]=[C:32]([CH2:31][NH:30][C:10]([C:7]4[N:8]=[N:9][C:4]([O:3][CH2:1][CH3:2])=[CH:5][CH:6]=4)=[O:12])[CH:33]=3)[C:37]2=[O:41])[CH2:47][CH2:46][C:45](=[O:48])[NH:44]1

Participants

6

Reactant 4

HCID 962WaterHCID 682631,1'-CarbonyldiimidazoleHCID 336758356-Ethoxypyridazine-3-carboxylic acidHCID 866307665-Aminomethyl-2-(2,6-dioxo-piperidin-3-yl)-isoindole-1,3-dione methane sulfonate

Product 1

HCID 577305166-ethoxy-pyridazine-3-carboxylic acid [2-(2,6-dioxo-piperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-5-ylmethyl]-amideYield 88%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
40 °C

Procedure

A stirred mixture of 6-ethoxy-pyridazine-3-carboxylic acid (0.50 g, 3.00 mmol) and CDI (0.54 g, 3.30 mmol) in N,N-dimethylformamide (20 mL) was heated to 40° C. under nitrogen. After 1 h, 5-aminomethyl-2-(2,6-dioxo-piperidin-3-yl)-isoindole-1,3-dione methane sulfonate (1.15 g, 3.00 mmol) was added and the mixture was heated at 40° C. for 1.5 h. The mixture was cooled to rt and water (40 mL) was added. After 1 h, the product was isolated by filtration, washed with water (10 mL) and dried in vacuo to give 6-ethoxy-pyridazine-3-carboxylic acid [2-(2,6-dioxo-piperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-5-ylmethyl]-amide as a white solid (1.15 g, 88% yield): HPLC: Waters Symmetry C18, 5 μm, 3.9×150 mm, 1 mL/min, 240 nm, 30/70 CH3CN/0.1% H3PO4, 6.89 min (98.61%); mp: 238-240° C.; 1H NMR (DMSO-d6) δ 1.42 (t, J=7.1 Hz, 3H, CH3), 1.96-2.14 (m, 1H, CHH), 2.42-2.69 (m, 2H, CHH, CHH), 2.78-3.01 (m, 1H, CHH), 4.58 (q, J=7.0 Hz, 2H, CH2), 4.68 (d, J=6.2 Hz, 2H, CH2), 5.14 (dd, J=5.4, 12.9 Hz, 1H, CH), 7.35 (d, J=9.1 Hz, 1H, Ar), 7.76-7.95 (m, 3H, Ar), 8.09 (d, J=9.1 Hz, 1H, Ar), 9.85 (t, J=6.2 Hz, 1H, NH), 11.12 (s, 1H, NH); 13C NMR (DMSO-d6) δ 14.28, 21.99, 30.93, 42.39, 48.99, 63.47, 117.91, 122.10, 123.53, 128.83, 129.82, 131.59, 133.57, 147.30, 149.11, 162.93, 165.86, 166.99, 167.13, 169.83, 172.75; LCMS: MH=438; Anal Calcd for C21H19N5O6: C, 57.66; H, 4.38; N, 16.01. Found: C, 57.32; H, 4.16; N, 15.80.

Workup

  1. temperaturethe mixture was heated at 40° C. for 1.5 h
  2. temperatureThe mixture was cooled to rt
  3. waitAfter 1 h
  4. customthe product was isolated by filtration
  5. washwashed with water (10 mL)
  6. customdried in vacuo

Sources & evidence

ORD record
ord-8602708bc7554505990a8125db9b4aaa
Source dataset
uspto-grants-2014_11
Patent number
US08877780B2

Reaction notes

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