4-Acetylbenzenesulphonamide → 4-[3E-(2,4-dimethoxy-5-pyrrolidin-1-ylphenyl)acryloyl]benzenesulfonamide

HRID 347369Notes

Reaction equation

HRID 347369 reaction equation
[C:1]([C:4]1[CH:9]=[CH:8][C:7]([S:10]([NH2:13])(=[O:12])=[O:11])=[CH:6][CH:5]=1)(=[O:3])[CH3:2].[CH3:14][O:15][C:16]1[CH:23]=[C:22]([O:24][CH3:25])[C:21]([N:26]2[CH2:30][CH2:29][CH2:28][CH2:27]2)=[CH:20][C:17]=1[CH:18]=O.C[O-].[Li+]>CN(C)C=O.O>[CH3:14][O:15][C:16]1[CH:23]=[C:22]([O:24][CH3:25])[C:21]([N:26]2[CH2:30][CH2:29][CH2:28][CH2:27]2)=[CH:20][C:17]=1/[CH:18]=[CH:2]/[C:1]([C:4]1[CH:5]=[CH:6][C:7]([S:10]([NH2:13])(=[O:11])=[O:12])=[CH:8][CH:9]=1)=[O:3]

Participants

6

Reactant 3

HCID 740654-AcetylbenzenesulphonamideHCID 4177230Lithium methanolateHCID 210825102,4-Dimethoxy-5-pyrrolidin-1-ylbenzaldehyde

Product 1

HCID 694900494-[3E-(2,4-dimethoxy-5-pyrrolidin-1-ylphenyl)acryloyl]benzenesulfonamideYield 60%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Procedure

Ex-48A: To a solution of 4-acetylbenzenesulfonamide (Ex-35A, 0.13 g, 0.64 mmol) and 2,4-dimethoxy-5-pyrrolidin-1-yl-benzaldehyde (Ex-38B, 0.15 g, 0.64 mmol) in N,N-dimethylformamide (5 mL) was added lithium methoxide (1.0 M in methanol, 1.6 mL, 1.6 mmol). The solution was allowed to stir at ambient temperature for 13 h and then at 40° C. for 2 h. HPLC indicated no further change of starting materials. The reaction mixture was then diluted with water, acidified to pH 5. The resulting precipitate was collected by filtration, washed with water, dried in vacuo. The crude product was slurried in ethanol overnight. The solid was collected by filtration, washed with ethanol, dried in vacuo to give 4-[3E-(2,4-dimethoxy-5-pyrrolidin-1-ylphenyl)acryloyl]benzenesulfonamide (0.16 g, 59%) as a red solid, m.p. 220–222° C. 1H-NMR (300 MHz, DMSO-d6) δ 8.22 (d, J=8.7 Hz, 2H), 8.04 (d, J=16.1 Hz, 1H), 7.93 (d, J=8.7 Hz, 2H), 7.64 (d, J=16.1 Hz, 1H), 7.52 (s, 2H), 7.18 (s, 1H), 6.67 (s, 1H), 3.86 (s, 6H), 3.19–3.17 (m, 4H), 1.84–1.83 (m, 4H). HRMS Calcd for C21H24N2O5S: 416.1408 (M+); Found: 416.1408.

Workup

  1. waitat 40° C. for 2 h
  2. filtrationThe resulting precipitate was collected by filtration
  3. washwashed with water
  4. customdried in vacuo
  5. waitThe crude product was slurried in ethanol overnight
  6. filtrationThe solid was collected by filtration
  7. washwashed with ethanol
  8. customdried in vacuo

Sources & evidence

ORD record
ord-8d711ecda1e64cf9bdaaec9708ec8622
Source dataset
uspto-grants-2007_02
Patent number
US07173129B2

Reaction notes

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