Sodium hydride → tert-butyl 2-[2-amino-6-(2,6-dichlorophenyl)-7-oxo-7H,8H-pyrido[2,3-d]pyrimidin-8-yl]acetate

HRID 3180

Reaction equation

[H-].[Na+].[NH2:3][C:4]1[N:5]=[CH:6][C:7]2[CH:13]=[C:12]([C:14]3[C:19]([Cl:20])=[CH:18][CH:17]=[CH:16][C:15]=3[Cl:21])[C:11](=[O:22])[NH:10][C:8]=2[N:9]=1.Br[CH2:24][C:25]([O:27][C:28]([CH3:31])([CH3:30])[CH3:29])=[O:26]>CN(C)C=O>[C:28]([O:27][C:25](=[O:26])[CH2:24][N:10]1[C:8]2[N:9]=[C:4]([NH2:3])[N:5]=[CH:6][C:7]=2[CH:13]=[C:12]([C:14]2[C:15]([Cl:21])=[CH:16][CH:17]=[CH:18][C:19]=2[Cl:20])[C:11]1=[O:22])([CH3:31])([CH3:30])[CH3:29]

Participants

Conditions

Temperature: 50 °C

Procedure

To a suspension of NaH (60% in mineral oil, 67 mg) in 10 mL of dimethylformamide was added 2-amino-6-(2,6-dichlorophenyl)-pyrido[2,3-d]pyrimidin-7(8H)-one (398 mg, 1.30 mmol). The mixture was heated at 45° C. to 55° C. for 40 minutes resulting in a clear solution. Tert-butyl bromoacetate (250 μL, 1.69 mmol) was added, and the solution was stirred at 50° C. for several minutes, then cooled to room temperature and poured onto 60 mL of ice water. The resulting precipitate was removed by filtration and washed with water. The solid was purified by flash chromatography, eluting with a gradient of 1:2 hexane:ethyl acetate to all ethyl acetate to provide 165 mg (30%) of [2-amino-6-(2,6-dichlorophenyl)-7-oxo-7H-pyrido[2,3-d]pyrimidin-8-yl]-acetic acid tert-butyl ester; mp 171°-173° C.

Workup

temperatureThe mixture was heated at 45° C. to 55° C. for 40 minutes
customresulting in a clear solution
temperaturecooled to room temperature
customThe resulting precipitate was removed by filtration
washwashed with water
customThe solid was purified by flash chromatography
washeluting with a gradient of 1:2 hexane

Sources & evidence

ORD record: ord-16c20da4564840b98de831447344a71e
Source dataset: uspto-grants-1998_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05733914

Linked notes

Loading…