4-Methylmorpholine → 2-Amino-4,6-dichlorobenzamide

To a solution of 2-amino-4,6-dichloro-benzoic acid (0.5 g, 2.43 mmol) in THF (22 mL) under nitrogen atmosphere was added successively N-(3-Dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (0.51 g, 2.67 mmol), N-hydroxybenzotriazole (0.36 g, 2.67 mmol) and N-methylmorpholine (0.3 mL, 2.67 mmol). The mixture was stirred for 1.5 h before a 50% ammonium hydroxide solution (1.03 mL, 14.58 mmol) was added. The mixture was stirred overnight. The solvent was evaporated under reduced pressure, water (20 mL) was added and the solution was extracted with EtOAc (50 mL×2). The combined organic layers were washed with water, brine, dried over sodium sulfate and evaporated under reduced pressure to provide crude yellow solid (0.45 g). The crude product was triturated with ether to give pure 2-amino-4,6-dichloro-benzamide (0.41 g, 82%). A mixture of 2-amino-4,6-dichloro-benzamide (0.2 g, 0.97 mmol), 4-[2-(tert-butyl-dimethyl-silanyloxy)-ethoxy]-3,5-dimethyl-benzaldehyde (0.3 g, 0.97 mmol), sodium hydrogensulfite (0.11 g, 1.05 mmol) and p-toluenesulfonic acid (0.093 g, 0.48 mmol) in N,N-dimethyl acetamide (8 mL) was stirred at 150° C. overnight under nitrogen atmosphere. The reaction mixture was cooled to room temperature, the solvent was evaporated under reduced pressure, then water (70 mL) was added and the precipitate was collected, and washed with water, dried under vacuum and triturated with ether to provide the crude mixture of 2-{4-[2-(tert-butyl-dimethyl-silanyloxy)-ethoxy]-3,5-dimethyl-phenyl}-5,7-dichloro-3H-quinazolin-4-one and 5,7-dichloro-2-[4-(2-hydroxy-ethoxy)-3,5-dimethyl-phenyl]-3H-quinazolin-4-one (0.298 g), which was used as such in the next step. To the above described mixture (0.298 g, 0.59 mmol) in tetrahydrofurane (5 mL) was added tetrabutylammonium fluoride (2.35 mL, 2.35 mmol) under nitrogen atmosphere. The reaction mixture was stirred overnight before the solvent was evaporated under reduced pressure and water was added to obtain a precipitate. The solid was filtered off, washed with water, dried under vacuum and triturated with ether to provide crude yellow solid (0.226 g, 98%). The crude was purified twice by flash column chromatography to give pure 5,7-dichloro-2-(4-(2-hydroxyethoxy)-3,5-dimethylphenyl)quinazolin-4(3H)-one (0.069 g, 19%). Selected data: MS (ES) m/z: 378.92, 380.88, 382.89; MP 260.8-262.6° C.

1. additionwas added
2. customThe solvent was evaporated under reduced pressure, water (20 mL)
3. additionwas added
4. extractionthe solution was extracted with EtOAc (50 mL×2)
5. washThe combined organic layers were washed with water, brine
6. dry with materialdried over sodium sulfate
7. customevaporated under reduced pressure
8. customto provide crude yellow solid (0.45 g)
9. customThe crude product was triturated with ether

ORD record

ord-9c6aef1ce6cb471b8ffa2c5dabb547ed

Source dataset

uspto-grants-2014_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08889698B2