Phthalimide potassium salt → HCID 7663500, compound

HRID 2098477Notes

Reaction equation

CS(O[CH2:6][CH2:7][O:8][C:9]1[CH:14]=[CH:13][CH:12]=[C:11]([Br:15])[CH:10]=1)(=O)=O.[C:16]1(=[O:26])[NH:20][C:19](=[O:21])[C:18]2=[CH:22][CH:23]=[CH:24][CH:25]=[C:17]12.[K]>CN(C=O)C>[Br:15][C:11]1[CH:10]=[C:9]([CH:14]=[CH:13][CH:12]=1)[O:8][CH2:7][CH2:6][N:20]1[C:19](=[O:21])[C:18]2=[CH:22][CH:23]=[CH:24][CH:25]=[C:17]2[C:16]1=[O:26]

Participants

Conditions

Temperature: 60 °C

Procedure

To a solution of mesylate 16 (24.05 g, 81.5 mmol) in anhydrous DMF (160 ml) was added potassium phthalimide (15.53 g, 83.8 mmol) and the reaction mixture was stirred at 60° C. for 14 h. The mixture was concentrated under reduced pressure and the residue was partitioned between hexane-EtOAc (7:1) and water. A precipitate formed which was collected by filtration, washed excessively with water and hexane, then dried in vacuum to give N-(2-(3-Bromophenoxy)ethyl)phthalimide (17) as white fluffy crystals (22.05 g). To collect a second batch of crystals, the organic layer of the filtrate was concentrated under reduced pressure. The residue was suspended in 10% EtOAc-hexanes. The solution was washed with water and the precipitate collected by filtration, washed excessively with water, then hexane and dried in vacuum to give phthalimide 17 (5.65 g). Combined yield (21.18 g, 98%). 1H NMR (400 MHz, CDCl3) δ 7.86 (m, 2H), 7.73 (m, 2H), 7.03-7.12 (m, 3H), 6.80 (ddd, J=8.0, 2.5, 1.4 Hz, 1H), 4.21 (t, J=6.9 Hz, 2H), 4.10 (t, J=6.0 Hz, 2H).

Workup

concentrationThe mixture was concentrated under reduced pressure
customthe residue was partitioned between hexane-EtOAc (7:1) and water
customA precipitate formed which
filtrationwas collected by filtration
washwashed excessively with water and hexane
customdried in vacuum

Sources & evidence

ORD record: ord-a2edf5368554439f92116f07dd8c3ec7
Source dataset: uspto-grants-2013_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08450527B2

Reaction notes

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