Cesium carbonate → 1,1-dimethylethyl 7-(6-amino-5-nitropyridin-3-yl)-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate

HRID 473915Notes

Reaction equation

Br[C:2]1[CH:3]=[C:4]([N+:9]([O-:11])=[O:10])[C:5]([NH2:8])=[N:6][CH:7]=1.[CH3:12][C:13]([O:16][C:17]([N:19]1[CH2:25][C:24]2[CH:26]=[C:27](B(O)O)[CH:28]=[CH:29][C:23]=2[O:22][CH2:21][CH2:20]1)=[O:18])([CH3:15])[CH3:14].C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCOCC1.O>[NH2:8][C:5]1[N:6]=[CH:7][C:2]([C:27]2[CH:28]=[CH:29][C:23]3[O:22][CH2:21][CH2:20][N:19]([C:17]([O:16][C:13]([CH3:14])([CH3:12])[CH3:15])=[O:18])[CH2:25][C:24]=3[CH:26]=2)=[CH:3][C:4]=1[N+:9]([O-:11])=[O:10]

Participants

Conditions

Temperature: 90 °C

Procedure

A suspension of 5-bromo-3-nitropyridin-2-amine (4.84 g, 22.2 mmol), (4-{[(1,1-dimethylethyl)oxy]carbonyl}-2,3,4,5-tetrahydro-1,4-benzoxazepin-7-yl)boronic acid (6.51 g, 22.2 mmol), dichloro[1,1-bis(diphenyl)phosphino]ferrocenepalladium (II) dichloromethane adduct (1.60 g, 10 mol %) in dioxane (75 mL) and water (15 mL) was degassed with nitrogen, and then cesium carbonate (14.46 g, 44.4 mmol) was added. The reaction mixture was stirred at 90° C. overnight. The mixture was cooled to room temperature, water (150 mL) was added and stirred for 30 min to give a precipitate. The product 1,1-dimethylethyl 7-(6-amino-5-nitropyridin-3-yl)-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate (8.1 g, 94% yield) was collected by filtration, dried under vacuum. MS (EI) for C19H22N4O5: 387.1 (MH+).

Workup

customwas degassed with nitrogen
temperatureThe mixture was cooled to room temperature
stirringstirred for 30 min
customto give a precipitate

Sources & evidence

ORD record: ord-1742e378dc8f47aeb947e160932d80b8
Source dataset: uspto-grants-2014_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08637499B2

Reaction notes

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