Iodine → Apabetalone

HRID 555465Notes

Reaction equation

[NH2:1][C:2]1[CH:10]=[C:9]([O:11][CH3:12])[CH:8]=[C:7]([O:13][CH3:14])[C:3]=1[C:4]([NH2:6])=[O:5].[O:15]([CH2:23][CH2:24][O:25][C:26]1[C:33]([CH3:34])=[CH:32][C:29]([CH:30]=O)=[CH:28][C:27]=1[CH3:35])[Si](C(C)(C)C)(C)C.II.C(=O)([O-])[O-].[K+].[K+]>CN(C)C=O>[OH:15][CH2:23][CH2:24][O:25][C:26]1[C:33]([CH3:34])=[CH:32][C:29]([C:30]2[NH:6][C:4](=[O:5])[C:3]3[C:2](=[CH:10][C:9]([O:11][CH3:12])=[CH:8][C:7]=3[O:13][CH3:14])[N:1]=2)=[CH:28][C:27]=1[CH3:35]

Participants

Conditions

Temperature: 70 °C

Procedure

A solution of 2-amino-4,6-dimethoxybenzamide (0.60 g, 3.06 mmol) and 4-[2-(tert-butyidimethylsilanoxy)ethoxy]-3,5-dimethylbenzaldehyde (0.856 g, 2.78 mmol) in N,N-dimethyl formamide (20 mL) was stirred at 70° C. for 1 h. Iodine (0.846 g, 3.33 mmol) and potassium carbonate (0.384 g, 2.78 mmol) were added and the reaction mixture was stirred at 70° C. for 16 h. The reaction mixture was poured into ice, and extracted with ethyl acetate. The organic layer was washed with water, brine, and dried over anhydrous Na2SO4. Removal of the solvent gave the crude product which was purified by column chromatography to give 2-(4-(2-hydroxyethoxy)-3,5-dimethylphenyl)-5,7-dimethoxyquinazolin-4(3H)-one (444 mg, 39%) as a white solid. Selected data: 229-231° C.

Workup

additionThe reaction mixture was poured into ice
extractionextracted with ethyl acetate
washThe organic layer was washed with water, brine
dry with materialdried over anhydrous Na2SO4
customRemoval of the solvent
customgave the crude product which
customwas purified by column chromatography

Sources & evidence

ORD record: ord-9e0402b2930c4d9788d71d4445c127e0
Source dataset: uspto-grants-2011_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08053440B2

Reaction notes

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